In short
The shape a body settles into is rarely a mistake. It is usually an answer to a question the nervous system believes is still open.
Put someone somewhere they feel unsafe and the body stiffens within seconds: less sway, tighter muscles, a narrower way of moving. That is a strategy, not a flaw.
Held long enough, the strategy stops being a response to a moment and becomes the way a person stands, sits and breathes all the time.
What follows is what can be measured about that shape, what it costs, and what it does not tell you about a person.
Is a held shape a fault, or a strategy?
A shape a body settles into is rarely a mistake it is making. It is usually an answer, a solution to a question the nervous system believes is still open.
Allan Adkin and Mark Carpenter showed how fast that answer gets composed. Reviewing research on height-induced postural threat, they found that standing people on a raised surface reliably produced what they call an ankle stiffening strategy: sway amplitude down, sway frequency up, electromyographic changes consistent with co-contraction of the lower-leg muscles. In every study they examined, people also leaned back, away from the edge, limiting movement in the direction of the perceived risk (Frontiers in Neurology, 2018). The floor had not changed. The estimate of consequence had, and posture reorganised around that estimate within seconds.
Kasia Kozlowska and colleagues, in Harvard Review of Psychiatry, place that reorganisation inside a longer sequence they call the defence cascade: innate, automatically activated states running in order, arousal, then flight or fight, then freezing, which they characterise as a flight-or-fight response put on hold (2015). Their most consequential observation is that humans frequently remain caught in trauma-linked response patterns long after the danger has gone.
Strategy is the right word, then, and so is outdated. A shape can be an accurate answer to a question nobody is asking any more.
What can surface electromyography actually see?
Surface electromyography is the plainest instrument in this story, and it is worth being precise about what it does. Electrodes sit on the skin over a muscle and record the electrical traffic arriving at the fibres beneath. It reads no emotion, recovers no history and diagnoses nothing. The question it answers is narrower: is a muscle with no job to do nevertheless being asked to work?
Ulf Lundberg and colleagues put that question to 62 women across mental arithmetic, the Stroop colour-word test and a cold pressor task. Against baseline, the stress sessions lifted blood pressure, heart rate, catecholamines, cortisol and self-reported stress, and the mental tests, on their own, raised trapezius activity (International Journal of Behavioral Medicine, 1994). Mental load, with nothing lifted, reaches the muscle.
Rolf Westgaard’s group then asked what happens when the stress stops. Recording 26 women with fibromyalgia and 25 healthy controls, they found trapezius activity significantly higher in the pain group during sympathetic activation, during mental stress and during instructed rest, yet similar to controls during arm movement and during an unrestrained evening (BMC Musculoskeletal Disorders, 2013). Read that middle finding twice. The clearest difference appeared when the muscle was told it could stop.
And what can it not see?
An instrument that can watch a muscle refuse to stand down still cannot tell you how that feels, and the gap is wider than intuition allows.
Dagfinn Bansevicius, Rolf Westgaard and Christian Jensen had 36 pain-free people perform a demanding reaction-time task for an hour. Pain did develop, most of it in the shoulder and neck, yet its correlation with trapezius activity was weak, and perceived tension was strongly related to fatigue and unrelated to the electromyographic measures at all (Headache, 1997). People felt tension the electrodes did not corroborate, and carried activity they never felt.
Reviewing the literature on generalised anxiety disorder, Michael Pluess, Andreas Conrad and Frank Wilhelm reached a similarly deflating conclusion: baseline measures do not reliably separate people with the disorder from those without, and experimental findings refute a simple direct relationship between anxiety and muscle tension (Journal of Anxiety Disorders, 2009).
So there are two accounts of the same shoulder, what is recorded and what is experienced, and neither is the truth the other is failing at. A number with nobody attached to it explains little; a felt sense with no measure beside it is hard to follow over time. Which is why a third reading is needed, and why it deserves naming honestly: interpretation.
Does the shape itself cause the pain?
Here the field turns humbling, and honesty is worth more than a tidy story.
Kelly Richards and colleagues photographed the sitting posture of 1,108 Australian seventeen-year-olds and sorted them by cluster analysis into four groups, from upright to slumped thorax with forward head. The odds of persistent neck pain did not differ between clusters (P = .773), nor did headaches or neck pain provoked by sitting (Physical Therapy, 2016). The same team followed 686 of them to age 22. Female sex and existing neck pain at 17 predicted persistent neck pain at 22; posture subgroup did not, and among the young women the more relaxed postures were, if anything, associated with slightly lower risk than upright sitting (Physical Therapy, 2021).
Zoom out and it holds. Christopher Swain and colleagues reviewed 41 systematic reviews of spinal posture, physical exposure and low back pain and found no consensus on causality: association has been documented, and association does not supply a causal explanation (Journal of Biomechanics, 2020). Where posture does track with pain the effect is modest and age-dependent, a meta-analysis by Nesreen Mahmoud and colleagues found greater forward head posture in adults with neck pain, with almost no such relationship in adolescents (Current Reviews in Musculoskeletal Medicine, 2019).
Does the load accumulate?
Load accumulates, and the biology has a name. Writing in the New England Journal of Medicine, Bruce McEwen set out allostatic load: the mediators that protect the body during a stress response, the very ones that mobilise energy and sharpen attention, exact a cost when the response is switched on too often or not switched off cleanly (1998). Protection and damage are one system, differently timed.
Harvard’s Center on the Developing Child adds the variable that decides which way early load goes: supportive, responsive relationships, as early in life as possible, can help prevent or reverse the effects of prolonged activation. Where adverse childhood experiences have been pooled across 253,719 adults, raised risk appears across a wide range of outcomes, very unevenly: weakly for physical inactivity, obesity and diabetes, more strongly for mental illness (Hughes and colleagues, The Lancet Public Health, 2017). Those figures describe risk across very large groups and say nothing about an individual’s fate. A high count is not a diagnosis, a prophecy or a fault, and a great many people with high exposure never develop the outcomes counted.
What helps a body organised around defence?
The levers are modest and all aim at one thing: giving a system that has been holding ready some permission to stop.
Lengthen the exhale. Ikuo Homma and Yuri Masaoka’s review in Experimental Physiology explains why breath is the accessible channel: respiration is governed in the brainstem for metabolic need and simultaneously shaped by limbic and cortical structures, so sadness, anxiety and fear all alter the rhythm (2008). It runs in both directions, which is what makes a longer out-breath a lever rather than a distraction.
Notice what holds when nothing is being asked of it. Alessandro Zani, Daniele Manfredini and colleagues alerted 153 healthy young adults twenty times a day for a week to report what the jaw was doing at that instant: muscles were genuinely relaxed only 76.4% of the time (Journal of Oral Rehabilitation, 2021). Sustained low-level activity, not heavy effort, is what the occupational research keeps associating with persistent neck and shoulder pain.
How does Diskin Life approach the shape sustained stress leaves?
The boundary first, plainly. Dr Ari practises as a Chiropractor, not as a psychologist. What is offered at the Centre in Fitzroy works with the physical side of what you have lived through: the holding, the guarding, the shape it left. The story itself is yours, and where you want it held professionally it belongs with a psychologist or your GP. What is attended to is narrower and entirely physical: the pattern of defence a life has left in how a body holds and moves now.
The three readings this article has been circling are the three the Centre works from. Measurement comes first: the Life Assessment brings careful baseline testing plus seven extraordinary measures, surface EMG among them. Your own perception comes second, weighed in the context of what you value: where a day tightens you, and what a less defended body would let you get on with. Interpretation comes third, informed by 40+ years and 25,000+ clients: what a measure and an experience mean when they agree, and what to make of them when they do not.
Care itself is gentle Nervous System Adjustments, light, precise contacts that cue the nervous system to reorganise how it runs you rather than forcing it, with the body doing the work, held inside the 3 Pulse Integration Process, whose Life Assessment, Life Upgrade and Life Momentum are interdependent, each strengthening the others. Everyone begins with a free, no-obligation Discovery Session: a conversation with Dr Ari, and nothing else.
An honest limitation
The evidence here is thinner than the story wants it to be. The electromyographic work is largely observational and drawn from particular occupational groups, mostly women in computer, service and healthcare roles; laboratory stress is not a life. It cannot establish that raised resting activity causes pain rather than accompanying it, and surface EMG serves far better as a group-level research measure than as an individual verdict.
Posture research does not support the claim that a particular alignment causes pain. The adverse childhood experience literature describes risk and dose across very large populations, relies mostly on retrospective self-report, and says nothing about any individual: a high count is not a diagnosis or a prophecy.
Chiropractic care is not psychological therapy, and no claim is made here that it treats trauma as a diagnosed condition. The psychological approaches named above were developed and tested as psychological therapies, in populations recruited for post-traumatic stress; that evidence belongs to them. If load is affecting your days, your relationships or your sleep, please speak with your GP or a psychologist.
Worth remembering
Mental load reaches muscle. In laboratory work, mental arithmetic and the Stroop test alone raised trapezius activity, with nothing lifted.
The tell is rest, not effort. The clearest difference between a chronic pain group and controls appeared during instructed rest.
Surface EMG records activity, not experience. Perceived tension has tracked poorly with the electrical record, which is why measurement, felt sense and interpretation are three readings rather than one.
A held shape is a strategy, not a fault, and prospective research does not show that upright sitting protects the neck.
Adverse childhood experience research describes risk across very large groups, never an individual’s fate. A high count is not a diagnosis, a prophecy or a fault.
General information only, not a diagnosis or personal health advice. For what you have lived through, a psychologist or your GP is the right conversation.