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Is the Autonomic Nervous System Ever Truly "In Balance"?
If you have been reading about the autonomic nervous system — perhaps because you live with a spinal cord injury, or you work with people who do — you will almost certainly have encountered the idea of "autonomic balance." The image is seductive: sympathetic on one side, parasympathetic on the other, and health is achieved when the two sit neatly level, like a set of scales in equilibrium.
It is a useful teaching shorthand. It is also, as modern physiology has demonstrated over the past three decades, an oversimplification that can actually mislead both clinicians and patients.
The fundamental question is this: does the autonomic nervous system ever truly achieve "balance" — and if not, what should we be aiming for instead? The answer has direct implications for how we think about autonomic dysfunction after spinal cord injury and for emerging interventions such as transcutaneous vagus nerve stimulation (tVNS) that aim to improve autonomic regulation.