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Isometric Contraction | Open Access Journals
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Journal of Physiotherapy & Physical Rehabilitation

ISSN: 2573-0312

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Isometric Contraction

An isometric contraction is a muscle contraction without movement. Isometric contractions are used to stabilize a joint, for example when a weight is held at the waist without lifting or lowering it. Dynamic contractions are muscle contractions with a fixed weight. They are divided into concentric and eccentric contractions. A concentric contraction occurs when the muscle length is shortened during a contraction, for example, a bicep curl. An eccentric contraction occurs when the muscle length is increased during the contraction, ie the "negative" contraction. Eccentric contractions are used to slow or control movement. Isokinetic contractions are activated at a constant speed and are created artificially by types of exercise equipment. The measurements of these contractions are often used in research circles, but little relevance has been proven under real conditions. Plyometrics refers to a contraction sequence when a rapid eccentric contraction precedes a concentric contraction such as when jumping. An example is a jumper lowering the body and eccentrically loading the gluteal muscles before the jump, which then requires contraction of the concentric gluteal muscles. Plyometric training can be particularly useful in sports rehabilitation. Force is the maximum force generated during a single contraction while power is the amount of force generated per unit of time.

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