Why Stretching Alone Hasn't Fixed Your Posture

If you’ve ever been told “you just need to strengthen your core” or “your tight muscles are pulling you out of shape”, you’ve heard the most common explanation for poor posture: muscular imbalance. Some muscles are tight, some are weak, and the body follows.

There’s truth in that. But it’s an incomplete picture. Muscles don’t decide what to do. They follow instructions from the nervous system. If we only look at the muscles, we may be treating the symptom rather than the system that’s directing them.

In this article we’ll look at how posture is organised by the nervous system, how a stressed, sympathetically driven nervous system can show up in the way we stand, sit and breathe, and how chiropractic care may help with this.

Posture is something the brain does, not something the body has

Standing upright against gravity takes constant, mostly unconscious work. Dozens of muscles adjust many times a second, guided by input from your joints, your eyes, your inner ear and your skin, and coordinated largely below the level of conscious thought.

This is why posture changes when we’re tired, anxious, in pain or simply concentrating hard on a screen. The muscles haven’t suddenly become weak. The instructions they’re receiving have changed.

Sympathetic dominance and the postures we associate with it

The sympathetic nervous system is our “fight or flight” response. It’s essential and healthy in short bursts. Problems arise when the system stays switched on and recovery never fully arrives. In clinic, this is often described as “sympathetic dominance”. Due to our modern lifestyles of constant, low-level stress, this is something we are seeing ever more commonly.

It’s important to say that this is a descriptive phrase rather than a formal diagnosis, but certain postural and movement patterns are commonly associated with a nervous system that’s running in a protective, high-alert state:

• Forward head posture and protracted shoulders, the “guarding” or “screen” posture.

• Raised, tense shoulders and a neck that finds it hard to fully relax.

• Upper-chest breathing, with the ribcage lifting rather than expanding at the sides and back.

• A braced or “gripped” trunk, sometimes with breath-holding during effort.

• Increased rounding of the upper back, reducing ribcage movement and making deep breathing harder.

None of these is a fixed sign of anything on its own. But the research gives some interesting clues about why they may travel together.

What the research suggests

Stress increases muscle tension, especially in the neck and shoulders. Experimental studies show that mental stress raises activity in the upper trapezius, and that the same low-threshold motor units used for physical work stay active, even during rest. Lack of recovery may matter more than the size of the stress itself [1, 2]. This is why many people say they 'carry stress in their shoulders'.

Head posture and autonomic function appear to be linked. In a cross-sectional study of 160 adults, those with marked forward head posture showed measurable differences in skin sympathetic responses and neck sensorimotor control compared with matched controls [3]. A related study found that a more forward head position was associated with a heart rate variability pattern consistent with greater sympathetic and reduced parasympathetic influence [4]. A small pilot study also found that departures from a neutral trunk posture were associated with higher heart rate and relative sympathetic activation [5]. The connection runs both ways. A stressed nervous system can pull us into protective postures, and sustained postures can in turn change the sensory input going back to the brain. Many researchers now think of this as a loop rather than a one-way street. While this research requires further development and scrutiny, it gives way to a potential link between posture and autonomic function of bodily joints, muscles and organ systems.

What this means for how we approach posture

A nervous-system-informed view encourages a broader set of questions:

• How is the person breathing at rest and under effort?

• Are they able to relax, or is their system stuck in a protective pattern?

• How are pain, stress, sleep and workload contributing?

• How well do they coordinate movement and stability, not just how much strength they have?

At Tring Chiropractic we monitor posture as one of several indicators of how your body is regulating stress. We take computerised posture scans throughout care and blend the findings of these with our other tests and checks to formulate a chiropractic care plan suited to your needs. By identifying and addressing problems in the spine and nervous system we often notice positive changes to posture, symptoms and quality of life.

Found your posture has declined in recent years? Tried all the exercises to 'fix posture' but with no success? Or eager to optimise your posture and wellbeing? Book a consultation with Tring Chiropractic today.

(Disclaimer: Results and suitability vary on a case by case basis and no guarantees can be made)

References

1. Lundberg U, Forsman M, Zachau G, et al. Effects of experimentally induced mental and physical stress on motor unit recruitment in the trapezius muscle. Work & Stress. 2002;16(2):166–178.

2. Lundberg U. Psykologisk stress och muskuloskeletala besvär: psykobiologiska mekanismer. Läkartidningen. 2003;100(21):1892–1895. PMID: 12815874.

3. Moustafa IM, Youssef A, Ahbouch A, Tamim M, Harrison DE. Is forward head posture relevant to autonomic nervous system function and cervical sensorimotor control? Cross sectional study. Gait Posture. 2020;77:29–35. doi:10.1016/j.gaitpost.2020.01.004

4. Text neck and its association with cardiac autonomic function, smartphone addiction, and psychophysiological status in young adults. [PMC12104847]

5. Effects of trunk posture on cardiovascular and autonomic nervous systems: a pilot study. Front Physiol. 2022;13:1009806. doi:10.3389/fphys.2022.1009806