![]() ![]() Although the term contraction implies shortening, when referring to the muscular system, it means muscle fibers generating tension with the help of motor neurons. While under tension, the muscle may lengthen, shorten, or remain the same. Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. (E.g., flexion of the lower arm (bending of the elbow joint) by an external force while contracting the triceps and other elbow extensor muscles to control that movement.Īn example of this in the context of a bench press would be that a yielding isometric would be holding the bar at a given place even though it could be pressed higher, and an overcoming would be pressing the bar up into the safety guards of a squat cage that prevent pushing the bar any higher. (E.g., extension of the lower arm via the elbow joint while contracting the triceps and other elbow extensor muscles.Įccentric: Against or in the opposite direction of contraction of a muscle. Isotonic movements are either concentric (working muscle shortens) or eccentric (working muscle lengthens).Ĭoncentric: (Of a motion), in the direction of contraction of a muscle. Isotonic: Of or involving muscular contraction against resistance in which the length of the muscle changes. ![]() Isometric: Of or involving muscular contraction against resistance in which the length of the muscle remains the same. Isometric contractions generate force without changing the length of the muscle.Eccentric contractions cause muscles to elongate in response to a greater opposing force.A concentric contraction causes muscles to shorten, thereby generating force.Isotonic contractions generate force by changing the length of the muscle and can be concentric contractions or eccentric contractions. ![]()
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