The process of force-generation in the fibres of any class of muscle, by the interaction of myosin head-groups in the thick filaments with actin molecules in one of the immediately neighbouring thin filaments.
Full Definition of CONTRACTION. 1. a: the action or process of contracting: the state of being contracted b: the shortening and thickening of a functioning muscle or muscle fiber c: a reduction in business activity or growth.  noun. The definition of contraction is the lengthening or shortening of a muscle fiber or a word formed by combining the sounds of two longer words. 1  An example of a contraction is the action of the uterus during the birth process. 2  An example of a contraction is the word doesn't from does not The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state. Muscle contractions can be described based on two variables: length and tension. A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same. In contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same. Furthermore, if the muscle length shortens, the contraction is concentric Noun. 1. muscle contraction - (physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber). contraction, muscular contraction. shortening-act of decreasing in length; the dress needs shortening. Braxton-Hicks contraction, false labor-painless contractions of the muscles of the uterus that continue throughout pregnancy with increasing frequency. vaginismus-muscular contraction that causes the vagina to close; usually an anxiety reaction before coitus or pelvic examination. As the load the muscle is required to lift decreases, contraction velocity increases. This occurs until the muscle finally reaches its maximum contraction velocity, V max. By performing a series of constant velocity shortening contractions, a force-velocity relationship can be determined. Contractions that permit the muscle to shorten are referred to as concentric contractions. An example of a concentric contraction in the raising of a weight during a bicep curl. In concentric contractions, the force generated by the muscle is always less than the muscle's maximum (P o). muscle contraction. the process of force-generation in the fibres of any class of muscle, by the interaction of myosin head-groups in the thick filaments with actin molecules in one of the immediately neighbouring thin filaments. concentric muscle contraction acceleration force generated within contracting agonist muscle tissue, by actin/myosin interaction; agonist muscle force overcomes antagonist muscle resistance, creating a net reduction in length of agonist muscle (see entry above). Muscle contraction is the activation of tension-generating sites within muscle fibers. In physiology, muscle contraction does not mean muscle shortening because muscle tension can be produced without changes in muscle length such as holding a heavy book or a dumbbell at the same position. Muscle contractions can be described based on two variables: length and tension. A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same. muscle contraction - (physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber). Braxton-Hicks contraction, false labor-painless contractions of the muscles of the uterus that continue throughout pregnancy with increasing frequency. vaginismus-muscular contraction that causes the vagina to close; usually an anxiety reaction before coitus or pelvic examination.
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muscle contraction meaning