eli5 why do muscles get tired after holding the same position for an extended period of time?
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It’s because your muscles contract chemically and are held in place chemically, but the mechanical force from holding something is constantly breaking those chemical bonds. It takes energy to reset the muscle position and re-establish the chemical bonds. You’re never technically holding something perfectly still because what’s really happening is a constant release and contraction due to those bonds breaking and reforming.
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