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contraction - the act of decreasing (something) in size or volume or quantity or scope. reduction, step-down, diminution, decrease - the act of decreasing or reducing something. enlargement, expansion - the act of increasing (something) in size or volume or quantity or scope.
(concentric action) the 'true' form of contraction of a muscle in which it shortens against a load (which may be only that of gravity on the relevant body part), and so does positive work. Hence concentric exercise: that in which the principal agonists act concentrically.See also muscle contraction.alled also shortening contraction. Dupuytren's contraction Dupuytren's contracture. eccentric contraction contraction in the presence of a resistive force that results in elongation of a muscle, used to perform negative work or to decelerate a body part.