Erik Peper and Meir Schneider
As a young child I laid on the couch and I read one book after the other. Hours would pass as I was drawn into the stories. By the age of 12 I was so nearsighted that I had to wear glasses. When my son started to learn to read, I asked him to look away at the far distance after reading a page. Even today at age 34, he continues this habit of looking away for a moment at the distance after reading or writing a page. He is a voracious reader and a novelist of speculative fiction. His vision is perfect. –Erik Peper
How come people in preliterate, hunting and gatherer, and agricultural societies tend to have better vision and very low rates of nearsightedness (Cordain et al, 2003)? The same appear true for people today who spent much of their childhood outdoors as compared to those who predominantly stay indoors. On the other hand, how come 85% of teenagers in Singapore are myopic (neasighted) and how come in the United States myopia rate have increased for children from 25% in the 1970s to 42% in 2000s (Bressler, 2020; Min, 2019)?
Why should you worry that your child may become nearsighted since it is easy correct with contacts or glasses? Sadly, in numerous cases, children with compromised vision and who have difficulty reading the blackboard may be labeled disruptive or having learning disability. The vision problems can only be corrected if the parents are aware of the vision problem (see https://www.covd.org/page/symptoms for symptoms that may be related to vision problems). In addition, glasses may be stigmatizing and children may not want to wear glasses because of vanity or the fear of being bullied.
The recent epidemic of near sightedness is paritally a result of disrespecting our evolutionary survival patterns that allowed us to survive and thrive. Throughout human history, people continuously alternated by looking nearby and at the distance. When looking up close, the extraocular muscles contract to converge the eyes and the ciliary muscles around the lens contract to increase the curvature of the lens so that the scene is in focus on the retina — this muscle tension creates near visual stress.
The shift from alternating between far and near vision to predominantly near vision and immobility
Figure 2. The traditional culture of Hdzabe men in Tanzania returning from a hunt. Notice how upright they walk and look at the far distance as compared to young people today who slouch and look predominantly at nearby screens.
Experience the effect of near visual stress.
Bring your arm in front of you and point your thumb up. Look at your thumb on the stretched out arm. Keep focusing on the thumb and slow bring the thumb four inches from your nose. Keep focusing on the thumb for a half minute. Drop the arm to the side, and look outside at the far distance.
What did you experience? Almost everyone reports feeling tension in the eyes and a sense of pressure inside around and behind their eyes. When looking at the distance, the tension slowly dissipates. For some the tension is released immediately while for others it may take many minutes before the tension disappears especially if one is older. Many adults experience that after working at the computer, their distant vision is more fuzzy and that it takes a while to return to normal clarity.
When the eyes focus at the distance, the ciliary muscles around lens relaxes so that the lens can flatten and the extra ocular muscles relax so that the eyes can diverge and objects in the distance are in focus. Healthy vision is the alternation between near and far focus– an automatic process by which the muscles of the eyes tightening and relax/regenerate.
Use develops structure and structure limits use
If we predominantly look at nearby surfaces, we increase near visual stress and the risk of developing myopia. As children grow, the use of their eyes will change the shape of the eyeball so that the muscles will have to contract less to keep the visual object into focus. If the eyes predominantly look at near objects, books, cellphones, tablets, toys, and walls in a room where there is little opportunity to look at the far distance, the eye ball will elongate and the child will more likely become near sighted. Over the last thirty year and escalated during COVID’s reside-in-place policies, children spent more and more time indoors while looking at screens and nearby walls in their rooms. Predominantly focusing on nearby objects starts even earlier as parents provide screens to baby and toddlers to distract and entertain them. The constant near vision remodels the shape of eye and the child will likely develop near sightedness.
Health risks of sightedness and focusing predominantly upon nearby objects
- Increased risk of get into an accident as we have reduced peripheral vision. In earlier times if you were walking in jungle, you would not survive without being aware of your peripheral vision. Any small visual change could indicate the possible presence food or predator, friend or foe. Now we focus predominantly centrally and are less aware of our periphery. Observe how your peripheral awareness decreases when you bring your nose to the screen to see more clearly. When outside and focusing close up the risk of accidents (tripping, being hit by cars, bumping into people and objects) significantly increases as shown in figure 3 and illustrated in the video clip.
Pedestrian accidents (head forward with loss of peripheral vision)
- Myopia increases the risk of eye disorder. The risk for glaucoma, one the leading causes of blindness, is doubled (Susanna, De Moraes, Cioffi, & Ritch, R. 2015). The excessive tension around the eyes and ciliary muscles around the lens can interfere with the outflow of the excess fluids of the aqueous humour through the schlemm canal and may compromise the production of the aqueous humour fluid. These canals are complex vascular structures that maintains fluid pressure balance within the anterior segment of the eye. When the normal outflow is hindered it would contribute to elevated intraocular pressure and create high tension glaucoma (Andrés-Guerrero, García-Feijoo, & Konstas, 2017). Myopia also increases the risk for retinal detachment and tears, macular degeneration and cataract. (Williams & Hammond, 2019).
By learning to relax the muscles around the lens, eye and face and sensing a feeling of soft eyes, the restriction around the schlemm canals is reduced and the fluids can drain out easier and is one possible approach to reverse glaucoma (Dada et al., 2018; Peper, Pelletier & Tandy, 1979).
- Increase in neck and upper back compression when the person cranes their head forward or looks down while reading books/articles, looking at a cellphone or a laptop screen, This often results in an increase of back, neck and shoulder pain as well as headaches (Harvey, Peper, Booiman, Heredia Cedillo, & Villagomez, 2018; Hansraj, 2014).
- Decrease in subjective energy and increase in helpless, hopeless, powerless and defeated thoughts when the person habitually looks down in a slouched position (Peper, Booiman, Lin, & Harvey, 2016; Peper, Lin, Harvey, & Perez, 2017).
WHAT CAN YOU DO?
The solutions are remarkable simple. Respect your evolutionary background and allow your eyes to spontaneously alternate between looking at near and far objects while being upright (Schneider, 2016; Peper, 2021; Peper, Harvey & Faass, 2020).
For yourself and your child
- Let children play outside so that they automatically look far and near.
- When teaching children to read have them look at the distance at the end of every paragraph or page to relax the eyes.
- Limit screen time and alternate with outdoor activities
- Every 15 to 20 minutes take a vision break when reading or watching screens. Get up, wiggle around, move your neck and shoulders, and look out the window at the far distance.
- When looking at digital screens, look away every few minutes. As you look away, close your eyes for a moment and as you are exhaling gently open your eyes.
- Practice palming and relaxing the eyes. For detailed guidance and instruction see the YouTube video by Meir Schneider.
Create healthy eye programs in schools and work
- Arrange 30 minute lesson plans and in between each lesson plan take a vision and movement breaks. Have children get up from their desks and move around. If possible have them look out the window or go outside and describe the furthest object they can see such as the shape of clouds, roof line or details of the top of trees.
- Teach young children as they are learning reading and math to look away at the distance after reading a paragraph or finishing a math problem.
- Teach palming for children.
- During recess have students play games that integrate coordination with vision such as ball games.
- Episodically, have students close their eyes, breathe diaphragmatically and then as they exhale slowly open their eyes and look for a moment at the world with sleepy/dreamy eyes.
- Whenever using screen use every opportunity to look away at the distance and for a moment close your eyes and relax your neck and shoulders.
BOOKS TO OPTIMIZE VISION AND TRANSFORM TECHSTRESS INTO TECHHEALTH
YOUTUBE PRESENTATION, Transforming Tech Stress into Tech Health.
ADDITIONAL BLOGS THAT FOCUS ON RESOLVING EYES STREAN AND TECHSTRESS
Cordain, L., Eaton, S.B., Miller, J. B., Lindeberg, S., & Jensen, C. (2003). An evolutionary analysis of the aetiology and pathogenesis of juvenile‐onset myopia. Acta Ophthalmologica Scandinavica, 80(2), 125-135.
Dada, T., Mittal, D., Mohanty, K., Faiq, M.A., Bhat, M.A., Yadav, R.K., Sihota, R., Sidhu, T,, Velpandian, T., Kalaivani, M., Pandey, R.M., Gao, Y., Sabel, B,A., & Dada, R. (2018). Mindfulness Meditation Reduces Intraocular Pressure, Lowers Stress Biomarkers and Modulates Gene Expression in Glaucoma: A Randomized Controlled Trial. J Glaucoma, 27(12), 1061-1067.
Harvey, R., Peper, E., Booiman, A., Heredia Cedillo, A., & Villagomez, E. (2018). The effect of head and neck position on head rotation, cervical muscle tension and symptoms. Biofeedback. 46(3), 65–71.
Adapted from the book, TechStress: How Technology
is Hijacking our Lives, Strategies for Coping and Pragmatic Ergonomics, by Erik Peper, Richard Harvey and Nancy Faass.
Peper, E., Harvey, R., & Faass, N. (2020), TechStress-How Technology is Hijacking our Lives, Strategies for Coping and Pragmatic Ergonomics. Berkeley, CA: North Atlantic Books.
Go behind the screen and watch Inna Khazan, PhD, faculty member at Harvard Medical School and author of Biofeedback and mindfulness in everyday life: Practical solutions for improving your health and performance, interview Erik Peper, PhD and Richard Harvey, PhD. coauthors of the new book, TechStress-How Technology is Hijacking our Lives, Strategies for Coping and Pragmatic Ergonomics.
Dr. Inna Khazan interviews Dr. Erik Peper about his new book Tech Stress. We talk about some of the ways in which technology overuse affects our health and what we can do about it.
Dr. Inna Khazan interviews Dr. Rick Harvey about his new book Tech Stress, the way technology overuse can affect adults and children, and what we can do about it.
We are excited about our upcoming book, TechStress-How Technology is Hijacking our Lives, Strategies for Coping and Pragmatic Ergonomics, that will be published August 25, 2020.
Evolution shapes behavior — and as a species, we’ve evolved to be drawn to the instant gratification, constant connectivity, and the shiny lights, beeps, and chimes of our ever-present devices. In earlier eras, these hardwired evolutionary patterns may have set us up for success, but today they confuse our instincts, leaving us vulnerable and stressed out from fractured attention, missed sleep, skipped meals, aches, pains, and exhaustion and often addicted to our digital devices.
Tech Stress offers real, practical tools to avoid evolutionary pitfalls programmed into modern technology that trip us up. You will find a range of effective strategies and best practices to individualize your workspace, reduce physical strain, prevent sore muscles, combat brain drain, and correct poor posture. The book also provides fresh insights on reducing psychological stress on the job, including ways to improve communication with coworkers and family.
Although you will have to wait until August 25th to have the book delivered to your home, you can already begin to implement ways to reduce physical discomfort, zoom/screen fatigue and exhaustion. Have a look the blogs below.
How evolution shapes behavior
How to optimize ergonomics
Hot to prevent and reduce neck and shoulder discomfort
How to prevent screen fatigue and eye discomfort
How to improve posture and prevent slouching
How to improve breathing and reduce stress
How to protect yourself from EMF
Adapted from the upcoming book, TechStress: How Technology is Hijacking Our Lives, Strategies for Coping, and Pragmatic Ergonomics, by Erik Peper, Richard Harvey and Nancy Faass.
While working in front of screens, many of us suffer from Zoom/screen fatigue, iNeck, shoulder and back discomfort, tired eyes, exhaustion and screen addiction (Peper, 2020; Fosslien & Duffy, 2020; So, Cheng & Szeto, 2017; Peper & Harvey, 2018). As we work, our shoulders and forearms tense and we are often not aware of this until someone mentions it. Many accept the discomfort and pain as the cost of doing work–not realizing that it may be possible to work without pain.
Observe how you and coworkers work at the computer, laptop or cellphone. Often we bring our noses close to the screen in order to the text more clearly and raise our shoulders when we perform data entry and use the mouse. This unaware muscle tension can be identified with physiological recording of the muscles electrical activity when they contract (electromyography) (Peper & Gibney, 2006; Peper, Harvey & Tylova, 2006). In most cases, when we rest our hands on our laps the muscle tension is low but the moment we even rest our hands on the keyboard or when we begin to type or mouse, our muscles may tighten, as shown in Figure 1. The muscle activity will also depend on the person’s stress level, ergonomic arrangement and posture.
Figure 1. Muscle tension from the shoulder and forearm increased without any awareness when the person rested their hands on the keyboard (Rest Keyboard) and during typing and mousing. The muscles only relaxed when the hands were resting on their lap (Rest Lap) (reproduced by permission from Peper, Harvey, and Faass, 2020).
Stop reading from your screen and relax your shoulders. Did you feel them slightly drop and relax?
If you experienced this release of tension and relaxation in the shoulders, then you were tightening your shoulders muscles without awareness. It is usually by the end of the day that we experience stiffness and discomfort. Do the following exercise as guided by the video or described in the text below to experience how discomfort and pain develop by maintaining low-level muscle tension.
While sitting, lift your right knee two inches up so that the foot is about two inches away from the floor. Keep holding the knee up in this position. Did you notice your breathing stopped when you lifted your knee? Are you noticing increasing tension and discomfort or even pain? How much longer can you lift the knee up?
Let go, relax and observe how the discomfort dissipates.
Reasons for the discomfort
The discomfort occurred because your muscles were contracted, which inhibited the blood and lymph flow through the tissue. When your muscles contracted to lift your knee, the blood flow in those muscles was reduced. Only when your muscles relaxed could enough blood flow occur to deliver nutrients and oxygen as well as remove the waste products of metabolism (Wan et al, 2017). From a physiological perspective, muscles work most efficiently when they alternately contract and relax. For example, most people can walk without discomfort since their muscles contract and relax with each step. However, you could hold your knee up for a few minutes before experiencing discomfort in those same muscles.
How to prevent discomfort.
To prevent discomfort and optimize health, apply the same concept of alternating tensing and relaxing to your neck, shoulder, back and arm muscles while working. Every few minutes move your arms and shoulders and let them relax. Interrupt the static sitting position with movement. If you need reminders to get up and move your body during the workday or long periods sitting in front of a device, you can download and install the free app, StretchBreak.
For more information, read and apply the concepts described in our upcoming book, TechStress: How Technology is Hijacking Our Lives, Strategies for Coping, and Pragmatic Ergonomics. The book explains why TechStress develops, why digital addiction occurs, and what you can do to prevent discomfort, improve health and enhance performance. Order the book from Amazon and receive it August 25th. Alternatively, sign up with the publisher and receive a 30% discount when the book is published August 25th. https://www.northatlanticbooks.com/shop/tech-stress/
Peper, E. & Gibney, K. H. (2006). Muscle Biofeedback at the Computer: A Manual to Prevent Repetitive Strain Injury (RSI) by Taking the Guesswork out of Assessment, Monitoring and Training. Amersfoort: The Netherlands: Biofeedback Foundation of Europe. ISBN 0-9781927-0-2. Free download of the the book: http://bfe.org/helping-clients-who-are-working-from-home/
Adapted from: Peper, E., Harvey, R. & Faass, N. (2020). TechStress: How Technology is Hijacking Our Lives, Strategies for Coping, and Pragmatic Ergonomics. Berkeley: North Atlantic Books.
Forty percent of adults and eighty percent of teenagers report experiencing significant visual symptoms (eyestrain, blurry vision, dry eyes, headaches, and exhaustion) during and immediately after viewing electronic displays. These ‘technology-associated overuse’ symptoms are often labeled as digital eyestrain or computer vision syndrome (Rosenfield, 2016; Randolph & Cohn, 2017). Even our distant vision may be affected— after working in front of a screen for hours, the world looks blurry. At the same time, we may experience an increase in neck, shoulders and back discomfort. These symptoms increase as we spend more hours looking at computer screens, laptops, tablets, e-readers, gaming consoles, and cellphones for work, taking online classes, watching streaming videos for entertainment, and keeping connected with friends and family (Borhany et al, 2018; Turgut, 2018; Jensen et al, 2002).
Eye, head, neck, shoulder and back discomfort are partly the result of sitting too long in the same position and attending to the screen without taking short physical and vision breaks, moving our bodies and looking at far objects every 20 minutes or so. The obvious question is, “Why do we stare at and are captured by, the screen?” Two answers are typical: (1) we like the content of what is on the screen; and, (2) we feel compelled to watch the rapidly changing visual scenes.
From an evolutionary perspective, our sense of vision (and hearing) evolved to identify predators who were hunting us, or to search for prey so we could have a nice meal. Attending to fast moving visual changes is linked to our survival. We are unaware that our adaptive behaviors of attending to a visual or auditory signals activate the same physiological response patterns that were once successful for humans to survive–evading predictors, identifying food, and discriminating between friend or foe. The large and small screen (and speakers) with their attention grabbing content and notifications have become an evolutionary trap that may lead to a reduction in health and fitness (Peper, Harvey & Faass, 2020).
Near vision stress
To be able to see the screen, the eyes need to converge and accommodate. To converge, the extraocular muscles of the eyes tighten; to focus (accomodation), the ciliary muscle around the lens tighten to increase the curvature of the lens. This muscle tension is held constant as long as we look at the screen. Overuse of these muscles results is near vision stress that contributes to computer vision syndrome, development of myopia in younger people, and other technology-associated overuse syndromes (Sherwin et al, 2012; Enthoven et al, 2020).
Continually overworking the visual muscles related to convergences increases tension and contributes to eyestrain. While looking at the screen, the eye muscles seldom have the chance to relax. To function effectively, muscles need to relax /regenerate after momentary tightening. For the eye muscles to relax, they need to look at the far distance– preferably objects green in color. As stated earlier, the process of distant vision occurs by relaxing the extraocular muscles to allow the eyes to diverge along with relaxing the ciliary muscle to allow the lens to flatten. In our digital age, where screen of all sizes are ubiquitous, distant vision is often limited to the nearby walls behind a screen or desk which results in keeping the focus on nearby objects and maintaining muscular tension in the eyes.
As we evolved, we continuously alternated between between looking at the far distance and nearby areas for food sources as well as signals indicating danger. If we did not look close and far, we would not know if a predator was ready to attack us. Today we tend to be captured by the screens. Arguably, all media content is designed to capture our attention such as data entry tasks required for employment, streaming videos for entertainment, reading and answering emails, playing e-games, responding to text notifications, looking at Instagram and Snapchat photos and Tiktok videos, scanning Tweets and using social media accounts such as Facebook. We are unaware of the symptoms of visual stress until we experience symptoms. To illustrate the physiological process that covertly occurs during convergence and accommodation, do the following exercise.
Sit comfortably and lift your right knee a few inches up so that the foot is an inch above the floor. Keep holding it in this position for a minute…. Now let go and relax your leg.
A minute might have seemed like a very long time and you may have started to feel some discomfort in the muscles of your hip. Most likely, you observed that when you held your knee up, you most likely held your breath and tightened your neck and back. Moreover, to do this for more than a few minutes would be very challenging.
Lift your knee up again and notice the automatic patterns that are happening in your body.
For muscles to regenerate they need momentary relaxation which allows blood flow and lymph flow to occur. By alternately tensing and relaxing muscles, they can work more easily for longer periods of time without experiencing fatigue and discomfort (e.g., we can hike for hours but can only lift our knee for a few minutes).
Solutions to relax the eyes and reduce eye strain
- Reestablish the healthy evolutionary pattern of alternately looking at far and near distances to reduce eyestrain, such as:
- Look out through a window at a distant tree for a moment after reading an email or clicking link.
- Look up and at the far distance each time you have finished reading a page or turn the page over.
- Rest and regenerate your eyes with palming. While sitting upright, place a pillow or other supports under our elbows so that your hands can cover your closed eyes without tensing the neck and shoulders.
- Cup the hands so that there is no pressure on your eyeballs, allow the base of the hands to touch the cheeks while the fingers are interlaced and resting your forehead.
- Close your eyes, imagine seeing black. Breathe slowly and diaphragmatically while feeling the warmth of the palm soothing the eyes. Feel your shoulders, head and eyes relaxing. Palm for 5 minutes while breathing at about six breaths per minute through your nose. Then stretch and go back to work.
Palming is one of the many practices that improves vision. For a comprehensive perspective and pragmatic exercises to reduce eye strain, maintain and improve vision, see the superb book by Meir Schneider, PhD., L.M.T., Vision for Life, Revised Edition: Ten Steps to Natural Eyesight Improvement.
Increased sympathetic arousal
Seeing the changing stimuli on the screen evokes visual attention and increases sympathetic arousal. In addition, many people automatically hold their breath when they see novel visual or hear auditory signals; since, they trigger a defense or orienting response. At the same time, without awareness, we may tighten our neck and shoulder muscles as we bring our nose literally to the screen. As we attend and concentrate to see what is on the screen, our blinking rate decreases significantly. From an evolutionary perspective, an unexpected movement in the periphery could be a snake, a predator, a friend or foe and the body responds by getting ready: freeze, fight or flight. We still react the same survival responses. Some of the physiological reactions that occur include:
- Breath holding or shallow breathing. These often occur the moment we receive a text notification, begin concentrating and respond to the messages, or start typing or mousing. Without awareness, we activate the freeze, flight and fight response. By breath holding or shallow breathing, we reduce or limit our body movements, effectively becoming a non-moving object that is more difficult to see by many animal predators. In addition, during breath holding, hearing become more acute because breathing noises are effectively reduced or eliminated.
- Inhibition of blinking. When we blink it is another movement signal that in earlier times could give away our position. In addition, the moment we blink we become temporarily blind and cannot see what the predator could be doing next.
- Increased neck, shoulder and back tension. The body is getting ready for a defensive fight or avoidance flight.
Experience some of these automatic physiological responses described above by doing the following two exercises.
Eye movement neck connection: While sitting up and looking at the screen, place your fingers on the back of the neck on either side of the cervical spine just below the junction where the spine meets the skull.
Feel the muscles of neck along the spine where they are attaching to the skull. Now quickly look to the extreme right and then to the extreme left with your eyes. Repeat looking back and forth with the eyes two or three times.
What did you observe? Most likely, when you looked to the extreme right, you could feel the right neck muscles slightly tightening and when you looked the extreme left, the left neck muscles slightly tightening. In addition, you may have held your breath when you looked back and forth.
Focus and neck connection: While sitting up and looking at the screen, place your fingers on the back of the neck as you did before. Now focus intently on the smallest size print or graphic details on the screen. Really focus and concentrate on it and look at all the details.
What did you observe? Most likely, when you focused on the text, you brought your head slightly forward and closer to the screen, felt your neck muscles tighten, and possibly held your breath or started to breathe shallowly.
As you concentrated, the automatic increase in arousal, along with the neck and shoulder tension and reduced blinking contributes to developing discomfort. This can become more pronounced after looking at screens to detailed figures, numerical data, characters and small images for hours (Peper, Harvey & Tylova, 2006; Peper & Harvey, 2008; Waderich et al, 2013).
Staying alert, scanning and reacting to the images on a computer screen or notifications from text messages, can become exhausting. in the past, we scanned the landscape, looking for information that will help us survive (predators, food sources, friend or foe) however today, we react to the changing visual stimuli on the screen. The computer display and notifications have become evolutionary traps since they evoke these previously adaptive response patterns that allowed us to survive.
The response patterns occur mostly without awareness until we experience discomfort. Fortunately, we can become aware of our body’s reactions with physiological monitoring which makes the invisible visible as shown in the figure below (Peper, Harvey & Faass, 2020).
Representative physiological patterns that occur when working at a computer, laptop, tablet or cellphone are unnecessary neck and shoulder tension, shallow rapid breathing, and an increase in heart rate during data entry. Even when the person is resting their hands on the keyboard, forearm muscle tension, breathing and heart rate increased.
Moreover, muscle tension in the neck and shoulder region also increased, even when those muscles were not needed for data entry task. Unfortunately, this unnecessary tension and shallow breathing contributes to exhaustion and discomfort (Peper, Harvey & Faass, 2020).
With biofeedback training, the person can learn to become aware and control these dysfunctional patterns and prevent discomfort (Peper & Gibney, 2006; Peper et, 2003). However, without access to biofeedback monitoring, assume that you respond similarly while working. Thus, to prevent discomfort and improve health and performance, implement the following.
- Practice breathing lower and slower to reduce sympathetic activation. Every few minutes remember to breathe slowly in and out through the nose. See the following blogs for more detailed instructions:
- Blink many times. Blink each time you click on a link, after typing a paragraph or after entering a few numbers.
- Get up, move, stretch and wiggle.
- Every few minutes do a small movement such as rotating your shoulders, dropping your hands to your lap.
- Every twenty minutes get up, stretch and walk around to reduce the chronic muscle tension.
- Install the free Stretch Break software on your computer or laptop to remind you to stretch… and then shows you how. Download free version from: https://stretchbreak.com/.
- Use small portable muscle biofeedback devices to learn awareness of the covert muscle tension and how to work without unnecessary muscle tension. For detailed training procedures see the free downloadable book by Erik Peper and Katherine Gibney, Muscle Biofeedback at the Computer- A Manual to Prevent Repetitive Strain Injury (RSI) by Taking the Guesswork out of Assessment, Monitoring and Training.
Finally, for a comprehensive overview based on an evolutionary perspective that explains why TechStress develops, why digital addiction occurs. and what can be done to prevent discomfort and improve health and performance, see our new book by Erik Peper, Richard Harvey and Nancy Faass, Tech Stress-How Technology is Hijack our Lives, Strategies for Coping and Pragmatic Ergonomics.
Enthoven, C. A., Tideman, W.L., Roel of Polling, R.J.,Yang-Huang, J., Raat, H., & Klaver, C.C.W. (2020). The impact of computer use on myopia development in childhood: The Generation R study. Preventtive Medicine, 132, 105988.
Peper, E. & Gibney, K. (2006). Muscle Biofeedback at the Computer- A Manual to Prevent Repetitive Strain Injury (RSI) by Taking the Guesswork out of Assessment, Monitoring and Training. The Biofeedback Federation of Europe. Download free PDF version of the book: http://bfe.org/helping-clients-who-are-working-from-home/
Peper, E., Wilson, V.S., Gibney, K.H., Huber, K., Harvey, R. & Shumay. (2003). The Integration of Electromyography (sEMG) at the Workstation: Assessment, Treatment and Prevention of Repetitive Strain Injury (RSI). Applied Psychophysiology and Biofeedback, 28 (2), 167-182.
Sherwin, J.C., Reacher, M.H., Keogh, R. H., Khawaja, A. P., Mackey, D.A.,& Foster, P. J. (2012). The association between time spent outdoors and myopia in children and adolescents. Ophthalmology,119(10), 2141-2151.
Waderich, K., Peper, E., Harvey, R., & Sara Sutter. (2013). The psychophysiology of contemporary information technologies-Tablets and smart phones can be a pain in the neck. Presented at the 44st Annual Meeting of the Association for Applied Psychophysiology and Biofeedback. Portland, OR.
Numerous people report that working at the computer at home is more tiring than working in the office. Although there are obvious advantages to working at home, there are also disadvantages (e.g., no space to work, challenging ergonomics, no escape from the family, lack of nonverbal cues used to communicate, less informal sharing at the water cooler, increased multitasking by working and having to take care of the children).
A major challenge is having a comfortable work space in your home. This may mean finding a place to put the computer, keyboard and screen. For some it is the kitchen table, desk in the corner of the bedroom, or coffee table while other it is in a totally separate room.
Incorrect ergonomic arrangement and stressed work style often increases neck, shoulder discomfort and aggravates eye strain and tiredness. Regardless how your digital work space is organized, implement the following life and work style suggestions and ergonomics recommendations to promote health.
LIFE AND WORK STYLE SUGGESTIONS
Take many, many, many breaks. Movement breaks will reduce the covert static tension that builds up as we sit in static positions and work at the computer.
- Every few minutes take a small break such as stand up and wiggle or role your shoulders. When performing the movements, stop looking at the screen and look around the room or out the window.
- Every 30 minutes get up walk around for and move your body. Use timers to notify you every 30 minutes to take a break (e.g., cellphone alarms or personal digital assistants such as Hey Google, Siri, or Alexa).
- Take vision breaks to reduce eye fatigue.
- Every few minutes look away from the screen and into the far distance and blink. If at all possible look outside at green plants which relaxes the near vision induced tension.
- Blink and blink again. When working at the computer we reduce our blinking rate. Thus, blink each time you click on a new link, finishing entering a column of numbers, etc.
- Close your eyes by letting the eye lids drop down as you also relax your jaw. Imagine a hook on top of your head which is pulling your head upward and at the same time drop your shoulders.
- Reduce glare and bright backgrounds
- Arrange your computer screen at 90 degrees to the brightest light source.
- Have a darker background behind you when participating in video conferencing (e.g., Zoom, Skype, GoToMeeting, WhatsApp, FaceTime). Your face will be visible.
- When stressed remember to breathe. As you inhale let your stomach expand as you exhale let the air flow out slowly.
- Stop watching and listening to the negative news (check the news no more than once a day). Watch positive and humorous movies.
- Get fresh air, go for a walk, and be in the sun
- Reconnect with friends and share positive experiences.
- Remind yourself, that this too shall pass.
ERGONOMIC RECOMMENDATIONS: MAKE THE WORLD YOURS
Good ergonomics means adapting the equipment and environment to you and not the other way around. Optimizes the arrangement of the chair, desk, keyboard, mouse, camera, screen and yourself as shown in Figure 1.
Figure 1. Recommended arrangement for working at the computer.
Arrange the laptop
The laptop is challenging because if your hands are at the right height for data entry on the keyboard, then you must look down to see the screen. If the screen at the right height, then you have to raise your hands to reach the keyboard. There are two solutions for this challenge.
- Use an external keyboard and mouse, then raise the laptop so that the top of the screen is at eye level. Use a laptop stand or a stack of books to raise the lap top.
- Use an external monitor for display, then use the laptop as your keyboard.
If these solutions are not possible, take many, many, many breaks to reduce the neck and shoulder stress.
Arrange the computer workstation
- Adjust the chair so that your forearms can rest on the table without raising your shoulders. This may mean sitting on a pillow. If the chair is then too high and your legs dangle, create a foot stool on which you can rest your feet.
- Adjust the monitor so that the top of the screen is at eye level. If the monitor is too low, raise it by putting some books underneath it.
- If possible, alternate standing and sitting while working.
Tech Stress: How Technology Is Hijacking Our Lives, Strategies for Coping, and Pragmatic Ergonomics provides insight in how discomfort, symptoms and media addiction develops and what you can do about it. It incorporates the role of evolutionary traps, how biofeedback makes the unaware aware, experiential physical and cognitive practices, and ergonomic recommendations to optimize health and productivity. A must book for anyone using digital devices. Peper, E., Harvey, R., & Faass, (2020). Tech Stress: How Technology Is Hijacking Our Lives, Strategies for Coping, and Pragmatic Ergonomics. Berkeley: North Atlantic Books.
Ergonomic suggestions for working at the computer and laptop.
11 tips for working at home
How our digital world activates evolutionary response patterns.
How posture affects health
“Although I knew I slouched and often corrected myself, I never realized how often and how long I slouched until the vibratory posture feedback from the UpRight Go 2™ cued me to sit up (see Figure 1).” -Erik Peper
Figure 1. Wearing an UpRight Go 2™ to increase awareness of slouching and as a reminder to change position.
For thousands of years we sat and stood erect. In those earlier times, we looked down to identify specific plants or animal track and then looked up and around to search for possible food sources, identify friends, and avoid predators. The upright, not slouched posture body posture, is innate and optimizes body movement as illustrated in Figure 2 (for more information, see Gokhale, 2013).
Figure 2. The normal aligned spine of a toddler and the aligned posture of a man carrying a heavy load.
Being tall and erect allows the head to freely rotate. Head rotation is reduced when we look down at our cell phones, tablets or laptops (Harvey, Peper, Booiman, Heredia Cedillo, & Villagomez, 2018). Our digital world captures us as illustrated in Figure 3.
Figure 3. Captured by the screen with a head forward positions.
Looking down and focusing on the screen for long time periods is the opposite of what supported us to survive and thrive when we lived as hunters and gatherers. When we look down, we become more oblivious to our surroundings and unaware of the possible predators that would have been hunting us for food.
This slouched position increases back, neck, head and eye tension as well as affecting respiration and digestion (Devi, Lakshmi, & Devi, 2018; Peper, Lin, & Harvey, 2017). After looking at the screens for a long time, we may feel tired or exhausted and lack initiative to do something else. Our mood may turn more negative since it is easier to evoke hopeless, helpless and powerless thoughts and memories when looking down than when looking up (Wilson, & Peper, 2004; Peper, Lin, Harvey, & Perez, 2017). In the down position, our brain has to work harder to evoke positive thoughts and memories or perform cognitive tasks as compared to when the head is erect (Tsai, Peper, & Lin, 2016; Peper, Harvey, Mason, & Lin, 2018). By looking down and focusing at the screen, our eyes may begin to strain. To be able to see objects near us, the extraocular muscles of the eyes contract to converge the eyes and the cilia muscles around the lens contract to increase the curvature of the lens so that the reading material is in focus.
Become aware how nearby vision increases eye strain.
Hold your arm straight ahead of you at eye level with your thumb up. While focusing on your thumb, slowly bring your thumb closer and closer to your nose. Observe the increase in eyestrain as you bring your thumb closer to your nose.
Eyestrain tends to develop when we do not relax the eyes by periodically looking away from the screen. When we look at the horizon or trees in the far distance the ciliary muscles and the extraocular muscles relax (Schneider, 2016).
Head forward posture increases neck and back tension
When we look down and concentrate, our head moves significantly forward. The neck and back muscles have to work much harder to hold the head up when the neck is in this flexed position. As Dr. Kenneth Hansraj, Chief of Spine Surgery New York Spine Surgery & Rehabilitation Medicine reported, “The weight seen by the spine dramatically increases when flexing the head forward at varying degrees. An adult head weighs 10-12 pounds in the neutral position. As the head tilts forward the forces seen by the neck surges to 27 pounds at 15 degrees, 40 pounds at 30 degrees, 49 pounds at 45 degrees and 60 pounds at 60 degrees.” (Hansraj, 2014). Our head tends to tilt down when we look at the text, videos, emails, photos, or games and stay in this position for long time periods. We are captured by the digital display and are unaware of our tight overused neck and back muscles. Straightening up so that the back of the head is re-positioned over the spine and looking into the distance may help relax those muscles.
To reduce discomfort caused by slouching, we need to reintegrate our prehistoric life style pattern of alternating between looking down to being tall and looking at the distant scenery or across the room. The first step is awareness of knowing when slouching begins. Yet, we tend to be unaware until we experience discomfort or are reminded by others (e.g, “Don’t slouch! Sit up straight!”). If we could have immediate posture feedback when we begin to slouch, our awareness would increase and remind us to change our posture.
Posture feedback with UpRight Go
Simple posture feedback device such as an UpRight Go 2™ can provide vibratory feedback each time slouching starts as the neck as the head goes forward. The wearable feedback device consists of a small sensor that is attached to the back of the neck or back (see Figure 1). After being paired with a cellphone and calibrated for the upright position, the software algorithm detects changes in tilt and provides vibratory feedback each time the neck/back tilts forward.
In our initial exploration, employees, students and clients used the UpRight feedback devices at work, at school, at home, while driving, walking and other activities to identify situations that caused them to slouch. The most common triggers were:
- Ergonomic caused movement such as bring the head closer to the screen or looking down at their cell phone (for suggestions to improve ergonomics see recommendations at the end of the article)
- Negative self-critical/depressive thoughts
- Crossing the legs protectively, shallow breathing, and other factors
After having identified some of the factors that were associated with slouching, we compared the health outcome of students who used the device for a minimum for 15 minutes a day for four weeks as compared to a control group who did not use the device. The students who received the UpRight feedback were also encouraged to use the feedback to change their posture and behavior and implemented some of the following strategies.
- Head down when looking at their laptop, tablet or cellphone.
- Change the ergonomics such as using a laptop stand and an external keyboard so that they could be upright while looking at the screen.
- Take many movement breaks to interrupt the static tension.
- Feeling tired.
- Take a break or nap to regenerate.
- Do fun physical activity especially activities where you look upward to re-energize.
- Negative self-critical, powerless, self-critical and depressive thoughts and feelings.
- Reframe internal language to empowering thoughts.
- Change posture by wiggling and looking up to have a different point of view.
- Crossing the legs.
- Sit in power position and breathe diaphragmatically.
- Get up and do a few movements such as shoulder rolls, skipping, or arm swings.
- Other causes.
- Identify the trigger and explore strategies so that you can sit erect without effort.
- Wiggle, move and get up to interrupt static muscle tension.
- Stand up and look out of the window and the far distance while breathing slowly
Posture feedback improves health
After four weeks of using the feedback device and changing behavior, the treatment group reported significant improvements in physical and mental health as shown in Figure 4 & 5.
Figure 4. Using the posture feedback significantly improved the Physical Health and Mental Health Composite Scores for the treatment group as compared to the control group (reproduced from Mason, L., Joy, Peper, & Harvey, 2018).
Figure 5. Pre to post changes after using posture feedback (reproduced from Colombo, Joy, Mason, L., Peper, Harvey, & Booiman, 2017).
Slouched posture and head forward and down position usually occurs without awareness and often results in long-term discomfort. We recommend that practitioners integrate wearable biofeedback devices to facilitate home practice especially for people with neck, shoulder, back and eye discomfort as well as for those with low energy and depression (Mason et al., 2018). We observed that a small wearable posture feedback device helped participants improve posture and decreased symptoms. The vibratory posture feedback provided the person with the opportunity to identify the triggers associated with slouching and the option to change their posture, behavior and environment.
As one participant reported, “I have been using the Upright device for a few weeks now. I mostly use the device while studying at my desk and during class. I have found that it helps me stay focused at my desk for longer time. Knowing there is something monitoring my posture helps to keep me sitting longer because I want to see how long I can keep an upright posture. While studying, I have found whenever I become frustrated, tired, or when my mind begins to wander I slouch. The Upright then vibrates and I become aware of these feelings and thoughts, and can quickly correct them. This device has improved my posture, created awareness, and increased my overall study time.”
Suggestions to reduce slouching and improve ergonomics
How to arrange your computer and laptop: https://peperperspective.com/2014/09/30/cartoon-ergonomics-for-working-at-the-computer-and-laptop/
Relieve neck and shoulder stiffness: https://peperperspective.com/2019/05/21/relieve-and-prevent-neck-stiffness-and-pain/
Colombo, S., Joy, M., Mason, L., Peper, E., Harvey, R., & Booiman, A. (2017). Posture Change Feedback Training and its Effect on Health. Poster presented at the 48th Annual Meeting of the Association for Applied Psychophysiology and Biofeedback, Chicago, IL March, 2017. Abstract published in Applied Psychophysiology and Biofeedback.42(2), 147.
Devi, R. R., Lakshmi, V.V., & Devi, M.G. (2018). Prevalence of discomfort and visual strain due to the use of laptops among college going students in Hyderabad. Journal of Scientific Research & Reports, 20(4), 1-5.
Harvey, R., Peper, E., Booiman, A., Heredia Cedillo, A., & Villagomez, E. (2018). The effect of head and neck position on head rotation, cervical muscle tension and symptoms. Biofeedback. 46(3), 65–71.
Mason, L., Joy, M., Peper, E., & Harvey, R. (2018).Wearable Posture Feedback Training: Effects on Health. Poster presented at the 2018 meeting of the 49th Annual Meeting of the Association for Applied Psychophysiology and Biofeedback, Orlando, FL. April 11-14.
Mason, L., Joy, M., Colombo, S., Peper, E., & Harvey, R. (2017). Biofeedback Strategies to Increase Social Justice and Health Equity: A wearable device to teach awareness of posture and improve self-care. Presented at the 19th Annual meeting of the Biofeedback Federation of Europe, Aveiro, Portugal, April 24-29th, 2017. Abstract in Applied Psychophysiology and Biofeedback,43(1), 93
“I am doing very well, and I am very healthy. The vulvodynia symptoms have never come back. Also,my stomach (gastrointestinal discomfort) has gotten much, much better. I don’t really have random pain anymore, now I just have to be watchful and careful of my diet and my exercise, which are all great things!” —A five-year follow-up report from a 28-year-old woman who had previously suffered from severe vulvodynia (pelvic floor pain).
Numerous clients and students have reported that implementing self-healing strategies–common sense suggestions often known as “grandmother’s therapy”—significantly improves their health and find that their symptoms decreased or disappeared (Peper et al, 2014). These educational self-healing approaches are based upon a holistic perspective aimed to reduce physical, emotional and lifestyle patterns that interfere with healing and to increase those life patterns that support healing. This may mean learning diaphragmatic breathing, doing work that give you meaning and energy, alternating between excitation and regeneration, and living a life congruent with our evolutionary past.
If you experience discomfort/symptoms and worry about your health/well-being, do the following:
- See your health professional for diagnosis and treatment suggestions.
- Ask what are the benefits and risks of treatment.
- Ask what would happen if you if you first implemented self-healing strategies before beginning the recommended and sometimes invasive treatment?
- Investigate how you could be affecting your self-healing potential such as:
- Lack of sleep
- Too much sugar, processed foods, coffee, alcohol, etc.
- Lack of exercise
- Limited social support
- Ongoing anger, resentment, frustration, and worry
- Lack of hope and purpose
- Implement self-healing strategies and lifestyle changes to support your healing response. In many cases, you may experience positive changes within three weeks. Obviously, if you feel worse, stop and reassess. Keep a log and monitor what you do so that you can record changes.
This self-healing process has often been labeled or dismissed as the “placebo effect;” however, the placebo effect is the body’s natural self-healing response (Peper & Harvey, 2017). It is impressive that many people report feeling better when they take charge and become active participants in their own healing process. A process that empowers and supports hope and healing. When participants change their life patterns, they often feel better. Their health worries and concerns become reminders/cues to initiate positive action such as:
- Practicing self-healing techniques throughout the day (e.g., diaphragmatic breathing, self-healing imagery, meditation, and relaxation)
- Eating organic foods and eliminating processed foods
- Incorporating daily exercise and movement activities
- Accepting what is and resolving resentment, anger and fear
- Taking time to regenerate
- Resolving stress
- Focusing on what you like to do
- Be loving to yourself and others
For suggestions of what to do, explore some of the following blogs that describe self-healing practices that participants implemented to improve or eliminate their symptoms.
Hot flashes and premenstrual symptoms https://peperperspective.com/2015/02/18/reduce-hot-flashes-and-premenstrual-symptoms-with-breathing/
Internet addiction https://peperperspective.com/2018/02/10/digital-addiction/
Irritable bowel syndrome (IBS) https://peperperspective.com/2017/06/23/healing-irritable-bowel-syndrome-with-diaphragmatic-breathing/
Math and test anxiety https://peperperspective.com/2018/07/03/do-better-in-math-dont-slouch-be-tall/
Trichotillomania (hair pulling) https://peperperspective.com/2015/03/07/interrupt-chained-behaviors-overcome-smoking-eczema-and-hair-pulling/
Peper, E., Lin, I-M, Harvey, R., Gilbert, M., Gubbala, P., Ratkovich, A., & Fletcher, F. (2014). Transforming chained behaviors: Case studies of overcoming smoking, eczema and hair pulling (trichotillomania). Biofeedback, 42(4), 154-160.
Is your neck stiff, uncomfortable and painful?
When driving is it more difficult to turn your head?
Neck and shoulder pain affect more than 30% of people (Fejer et al, 2006; Cohen, 2015). This blog explores some strategies to reduce or prevent neck stiffness and discomfort and suggests practices to reduce discomfort and increase flexibility if you already are uncomfortable.
Shifts in posture may optimize neck flexibility
In our modern world, we frequently engage in a forward head position while looking at electronic devices or typing on computers. Prolonged smart phone usage has the potential to negatively impact posture and breathing functions (Jung et al., 2016) since we tilt our head down to look at the screen. Holding the head in a forward position, as displayed in Figure 1, can result in muscle tension in the spine, neck, and shoulders.
Fig 1. Forward head and neck posture in comparison to a neutral spine. Source: https://losethebackpain.com/conditions/forward-head-posture/
Whenever you bring your head forward to look at the screen or tilt it down to look at your cellphone, your neck and shoulder muscles tighten and your breathing pattern become more shallowly. The more the head is forward, the more difficulty is it to rotate your head as is describe in the blog, Head position, it matters! (Harvey et al, 2018). Over time, the head forward position may lead to symptoms such as headaches and backpain. On the other hand, when we shift to an aligned upright position throughout the day, we create an opportunity to relieve this tension as shown in Figure 2.
Figure 2. EMG and respiration recording from a subject sitting with a forward head position and a neutral, aligned head position. The neck and shoulder muscle tension was recorded from the right trapezius and left scalene muscles (Mason et all, unpublished). .
The muscle tension recorded from scalene and trapezius muscles (neck and shoulder) in Figure 2 shows that as the head goes forward or tilts down, the muscle tension significantly increases. In most cases participants are totally unware that their neck tightens. It is only after looking at the screen or focus our eyes until the whole day that we notice discomfort in the late afternoon.
Experience this covert muscle tension pattern in the following video, Sensing neck muscle tension-The eye, head, and neck connection.
Interrupt constant muscle tension
One possible reason why we develop the stiffness and discomfort is that we hold the muscles contracted for long time in static positions. If the muscle can relax frequently, it would significantly reduce the probability of developing discomfort. Experience this concept of interrupting tension practice by practicing the following:
- Sit on a chair and lift your right foot up one inch up from the floor. Keep holding it up? For some people, as soon as five seconds, they will experience tightening and the onset of discomfort and pain in the upper thigh and hip.
How long could you hold your foot slight up from the floor? Obviously, it depends on your motivation, but most people after one minute want to put the foot down as the discomfort become more intense. Put the foot down and relax. Notice the change is sensation and for some it takes a while for the discomfort to fade out.
- The reason for the discomfort is that the function of muscle is to move a joint and then relax. If tightening and relaxation occurs frequently, then there is no problem
- Repeat the same practice except lift the foot, relax and drop it down and repeat and repeat. Many people can easily do this for hours when walking.
What to do to prevent neck and shoulder stiffness.
Interrupt static muscle neck tension by moving your head neck and shoulder frequently while looking at the screen or performing tasks. Explore some of the following:
- Look away from the screen, take a breath and as you exhale, wiggle your head light heartedly as if there is a pencil at reaching from the top of your head to the ceiling and you are drawing random patterns on the ceiling. Keep breathing make the lines in all directions.
- Push the chair back from the desk, roll your right shoulder forward, up and back let it drop down and relax. Then roll you left shoulder forward up and back and drop down and relax. Again, be sure to keep breathing.
- Stand up and skip in place with your hands reaching to the ceiling so that when your right foot goes up you reach upward with your left hand toward the ceiling while looking at your left hand. Then, as your left foot goes up your reach upward to the ceiling with your right hand and look at your right hand. Smile as you are skipping in place.
- Install a break reminder program on your computer such as Stretch Break to remind you to stretch and move.
- Learn how to sit and stand aligned and how to use your body functionally such as with the Gokhale Method or the Alexander Technique (Gokhale, 2013; Peper et al, in press, Vineyard, 2007).
- Learn awareness and control neck and shoulder muscle tension with muscle biofeedback. For practitioners certified in biofeedback BCB, see https://certify.bcia.org/4dcgi/resctr/search.html
- Become aware of your collapsed and slouching wearing a posture feedback device such as UpRight Go on your upper back. This device provides vibratory feedback every time you slouch and reminds you to interrupt slouching and be upright and alighned.
Arrange your computer screen and keyboard so that the screen is at eye level instead of having to reach forward or look down. Similarly, hold your cell phone so that it is at eye level as shown in Figure 3 and 4.
Figure 3. Slouching forward to see the laptop screen can be avoided by using an external keyboard, mouse and desktop riser. Reproduced by permission from www.backshop.nl
Figure 4. Avoid the collapsed while looking down at a cell phone by resting the arms on a backpack or purse and keeping the spine and head alighned. Photo of upright position reproduced with permission from Imogen Ragone, https://imogenragone.com/
If you are squinting, bringing your nose to the screen, or if the letters are too small or blurry, have your eyes checked to see if you need computer glasses. Generally do not use bifocals or progressive glasses as they force you to tilt your head up or down to see the material at a specific focal length. Other options included changing the display size on screen by making the text and symbols larger may allow you see the screen without bending forward. Just as your muscle of your neck, your eyes need many vision breaks. Look away from the screen out of the window at a distant tree or for a moment close your eyes and breathe.
What to do if you have stiffness and discomfort
My neck was stiff and it hurt the moment I tried to look to the sides. I was totally surprised that I rapidly increased my flexibility and reduced the discomfort when I implemented the following two practices.
Begin by implementing the previous described preventative strategies. Most important is to interrupt static positions and do many small movement breaks. Get up and wiggle a lot. Look at the blog, Freeing the neck and shoulder, for additional practices.
Then, practice the following exercises numerous times during the day to release neck and shoulder tension and discomfort. While doing these practices exhale gently when you are stretching. If the discomfort increases, stop and see your health professional.
Cohen, S.P. (2015). Epidemiology, Diagnosis, and Treatment of Neck Pain. Mayo Clinic Proceedings, 90 (2), 284-299. https://doi.org/10.1016/j.mayocp.2014.09.008
Fejer, R., Kyvik, K.Ohm, & Hartvigesen, J. (2006). The prevalence of neck pain in the world population: a systematic critical review of the literature. European Spine Journal, 15(6), 834-848. https://doi.org/10.1007/s00586-004-0864-4
Gokhale, E. (2013). 8 Steps to a Pain-Free Back. Pendo Press.
Harvey, R., Peper, E., Booiman, A., Heredia Cedillo, A., & Villagomez, E. (2018). The effect of head and neck position on head rotation, cervical muscle tension and symptoms. Biofeedback. 46(3), 65–71.
Mason, L., Peper, E., Harvey, R., & Hernandez, W. (unpublished). Healing headaches. Does success sustain over time?
Peper, E., Krüger, B., Gokhale, E., & Harvey, R. (in press). Comparing Muscle Activity and Spine Shape in Various Sitting Styles. Biofeedback.
Vineyar, M. (2007). How You Stand, How You Move, How You Live: Learning the Alexander Technique to Explore Your Mind-Body Connection and Achieve Self-Mastery. Boston: Da Capo Lifelong Books.