College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What defines an isometric contraction of a muscle?

  1. The angle of the joint remains the same while muscle exerts force

  2. The muscle shortens while exerting force

  3. The muscle lengthens while exerting force

  4. The muscle is stretched without exerting any force

The correct answer is: The angle of the joint remains the same while muscle exerts force

An isometric contraction of a muscle is characterized by the fact that the angle of the joint remains the same while the muscle exerts force. In this type of contraction, the muscle generates tension without changing its length, meaning that it does not shorten or lengthen. This occurs when a muscle is activated and is working against a resistance that matches the force being generated, leading to stabilization of the joint without any movement occurring. This concept is important in therapeutic and rehabilitation contexts, as isometric exercises can help maintain muscle strength and endurance without placing additional stress on the joints. Understanding the mechanics of isometric contractions aids massage therapists in developing appropriate treatments and exercises for clients recovering from injuries or those who need to build stability without excessive movement.

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