NASM Muscle Action Spectrum
Terms in this set (9)
Eccentric Muscle Action
Occurs when a muscle develops tension while lengthening.
Concentric Muscle Action
When a muscle exerting force greater than the resistive force, resulting in shortening of the muscle.
Isometric Muscle Action
When a muscle exerting force equal to the force being placed on it leading to no visible change in the muscle length.
Isokinetic Muscle Action
When a muscle shortens at a constant speed over the full range of motion.
Force is produced, muscle tension is developed, and movement occurs through a given range of motion (constant muscle tension). Eccentric / Concentric.
Moving in the same direction as the resistance
Moving in the opposite direction of the force
No visible movement with or against resistance
The speed of movement is fixed, and resistance varies with the force exerted
(rehabilitation training equipment)
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