Q:

What is an eccentric contraction?

A:

Quick Answer

An eccentric contraction is a muscle contraction that is caused by external force greater than the force of the muscle itself, causing the muscle to lengthen. During the movement, the tension in the muscle remains unchanged.

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About.com continues by explaining that common exercises that can cause this to occur are push-ups or pull-ups, lowering weights and running uphill. It can also happen during any sport that requires the individual to use controlled movements. About.com suggests that eccentric contractions are related to the early stages of delayed muscle soreness, where the muscles begin to feel painful a few days after the exercise has occurred.

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Related Questions

  • Q:

    Which type of muscular contraction is defined as a contraction which moves against a constant resistance?

    A:

    Boundless defines an isometric contraction as a contraction against a constant resistance. Basically, this means that the muscle is not changing in length or moving at the joints, but it is still contracting.

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  • Q:

    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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  • Q:

    What is an external force applied to an object?

    A:

    An external force is a force that originates from an object outside of a defined system. For example, if a system is defined as only the bob in a pendulum, both the rope and gravity exert an external force on the bob. If the bob and cord are the system, the force of gravity on the bob and the force the ceiling exerts on the bob are external forces.

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