Postural Responses Evoked by Unilateral Vibration of Lower Limb Muscles in Standing Subjects
Integration of somatosensory information from different regions of the body is an important mechanism for maintaining upright posture, in which proprioceptive afferentation from the lower limb does not play a negligible role. Bilateral vibration of lower limb muscles, which activates muscle afferents in a specific way, is able to evoke body tilts or even a falling reaction of the subject (Eklund, 1972; Gurfinkel et al., 1977). Postural responses probably result from a change of general somesthetic information about body position evoked by muscle afferent activity. In the present work we have tested the possibility of inducing postural responses by vibration of a single muscle of the lower extremity and simultaneously, we tried to find whether the evoked afferent activity can influence the integration of somesthetic information about body position.
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