eli5 why do muscles get tired after holding the same position for an extended period of time?
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Think of it like a pneumatic piston holding up a weight, except the piston is a bit leaky so you need to pump in air continuously to maintain the position. The chemical reactions in muscles need to occur continuously to keep the muscle pulling. (A similar analogy is, you need to keep applying an electric current to an electromagnet to sustain the magnetic field).
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