(physiology) Of or involving muscular contraction against resistance in which the length of the muscle changes and the tension differs due to an increasing load or difference in leverage.
(physiology, of a motion) Against or in the opposite direction of contraction of a muscle (such as results from flexion of the lower arm (bending of the elbow joint) by an external force while contracting the triceps and other elbow extensor muscles to control that movement; opening of the jaw while flexing the masseter).
(neurology) A neurobehavioral disorder that involves patients grabbing objects in view and starting the appropriate behavior associated with it at an inappropriate time.
(physiology) Of or involving muscular contraction against resistance in which the length of the muscle changes. Antonym is isometric. Isotonic movements are either concentric (working muscle shortens) or eccentric (working muscle lengthens). See also Wikipedia:Isotonic (exercise physiology)
(physiology, countable) A state of muscle tension caused by sustained contraction arising from a rapid series of nerve impulses which do not allow the muscle to relax.
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