title: [Muscle tonus in rigidity and spasticity].
abstract: The results of the examination of the muscle tone by passive movement of the extremity at a low and high rate in patients with spasticity are discussed. In parkinsonism high resistance was noted to passive movements of the extremity at a low rate (with a period of oscillatory movement of 100 s and more) as well as in the first cycles of rapid sinusoidal movement (with a period of 1 s) if the extremity had been at rest for a lengthy period of time. In spasticity of other etiology, there was a gradual increase of the amplitude on the mechanomyogram in high rates of passive movements, which was evidently due to growth of stimulation in the stretch-reflex arc from cycle to cycle as the result of sumation with trace stimulation from the preceding cycles. The shape of the spectromechanomyogram, which is marked by a rise in the region of the high rates, is considered to be a sign of spasticity, whereas the size of this rise is accepted as a quantitative index of the spastic component of the muscle tone.
mesh_terms: D004576:Electromyography; D006429:Hemiplegia / Q000503:physiopathology*; D006801:Humans; D009127:Muscle Rigidity / Q000503:physiopathology*; D009128:Muscle Spasticity / Q000503:physiopathology*; D009129:Muscle Tonus; D010300:Parkinson Disease / Q000503:physiopathology*
vernacular_title: Osobennosti myshechnogo tonusa pri rigidnosti i spastichnosti.