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Individual differences |
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Human tonic musclesEdit
It can specifically refer to a muscle which is composed mainly of slow muscle fibers. As these types of muscles (trapezius, calves, jaw) tend to be toned, they tend to shorten and be relatively inflexible and therefore tend to be short in humans.
Typical tonic muscles include muscles which are used to protect and prepare the body under fight or flight situations, a reaction to the hormones epinephrine (adrenaline) and cortisol and other innate autonomic nervous system reactions.
- ↑ "Back to the Basics for the New Year", by Paul Chek
- ↑ "Posture: Alternatives to The Prevailing Paradigm, Part One. Traditional Approaches to Postural And Musculoskeletal Dysfunction" by Steven Goldstein.
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