Q:

What is an isotonic contraction?

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Quick Answer

According to Springfield Technical Community College, isotonic contraction occurs when a muscle length changes and causes movement of a body part. As Wikipedia explains, the name isotonic implies that the tension in the muscle during the movement remains unchanged.

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Full Answer

There are two types of isotonic contractions, according to Wikipedia: concentric and eccentric. During a concentric contraction, the external force applied is lesser than the force generated by the muscle, resulting in shortening. During an eccentric contraction, the external force is greater than the muscle force, causing the muscle to lengthen. Isotonic contractions are present in all lifting exercises and almost all physical activities, including eccentric tension-stimulated muscle strengthening.

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Related Questions

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    What are dynamic and static contractions?

    A:

    A static (or isometric) contraction occurs when a muscle generates force while the joint angle remains the same. An example would be what happens when a person pushes against a wall. The muscles contract but the joint remains unmoved. A dynamic (or isotonic) contraction occurs when the force generated by the muscle causes movement in the joint. Dynamic contractions occur during most physical activities.

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  • Q:

    How do muscles respond to exercise?

    A:

    According to MedicineNet, muscles respond to exercise through contraction and resistance, both of which eventually result in increased muscular strength. Neural impulses direct fibers to contract, resulting in voluntary exercise. There are three different types of muscles that are worked during exercise, including skeletal, smooth and cardiac muscle, and each one responds differently to physical exercise.

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    What are prime mover muscles?

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    Prime mover muscles are the muscles that initiate the source of movement during physical action. These muscles do not act alone. They act simultaneously with other muscles recruited to perform the specific action.

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    What are the four functions of muscles?

    A:

    The four functions of the muscular system are movement, maintenance of posture, joint stabilization, and heat generation, states Inner Body. The primary function of the muscles is to provide contraction in order to move the body as a whole or move materials through the body.

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