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ACSM Personal Trainer

Category - Exercise Programming and Implementation

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Which muscle action produces force without changing the muscle’s physical length?

Concentric muscle action
Contraction
Eccentric muscle action
Isometric muscle action

Explanation

Answer: D - The concentric muscle action, also called a contraction, is the event where a muscle produces enough force to overcome an external load and shorten itself. Eccentric muscle action produces force while the muscle lengthens.

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