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I read on http://www.spine-health.com/glossary/muscle-tension:

Muscle tension refers to the condition in which muscles of the body remain semi-contracted for an extended period.

What is the difference between a "semi-contracted" muscle and a "contracted" muscle?

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If you consider the length of a muscle can vary from resting length to shortest length, my guess is that semi-contracted is somewhere in between. I believe that spine-health.com isn't being entirely clear with their definitions.

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  • $\begingroup$ I think they're refering to rate coding and motor unit recruitment. $\endgroup$
    – pbond
    Commented Nov 27, 2016 at 23:41

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