The effects of muscle vibration in spasticity, rigidity, and cerebellar disorders.
نویسندگان
چکیده
The development of the muscle vibration technique in humans provides a new means for studying the role played by muscle afferents in motor control and, furthermore, the technique seems to have diagnostic as well as therapeutic applications. It is now well documented that high frequency mechanical vibration applied to any skeletal muscle in man tends to induce the following reflex response: sustained contraction of the muscle vibrated and simultaneous relaxation of its prime antagonists (Eklund and Hagbarth, 1965, 1966; Hagbarth and Eklund, 1966a; de Gail, Lance, and Neilson, 1966; Lance, de Gail, and Neilson, 1966; Rushworth and Young, 1966). This response has been named TVR (tonic vibration reflex, Eklund and Hagbarth, 1966). Only one kind of muscle afferent unit is known, which, in addition to being sensitive to high frequency vibration, can induce this particular reflex pattern-that is the Ia afferent of the muscle spindles (primary ending), supplying nuclear bag as well as nuclear chain fibres and mediating the phasic as well as the tonic stretch reflex (for references see Jansen, 1962; Granit, 1964; Matthews, 1964; Rushworth, 1964; Eldred and Buchwald, 1967).2 There is little doubt that high frequency vibration preferentially excites spindle receptor organs with dynamic properties but the resulting sustained activity in the Ia afferents may to the centres 'resemble' a discharge from spindle organs of the static type. It is still unknown to what extent the vibration reflex in man utilizes the monosynaptic path of the phasic stretch reflex (tendon jerk) or to what extent the same motoneurones are involved in the mediation of the two reflexes (for references see Lang and Vallbo, 1967). However, there is often a striking lack of correspondence between the strength
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ورودعنوان ژورنال:
- Journal of neurology, neurosurgery, and psychiatry
دوره 31 3 شماره
صفحات -
تاریخ انتشار 1968