Modulation of soleus H reflex by lateral tilting in man

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Abstract
Static vestibular infuences on extensor tone of the lower limbs in man were studied by analyzing the changes in right soleus H‐reflex (RSHR) area in relation to lateral titings. Eight normal asult volunteers were tested in an experimental situation designed to minimize all afferent inputs, except the vestibular ones. Each subject was seated on a chair which could be tited laterally from the vertical to both sieds. Lateral titings were applied at a random order from the vertical (0° control position) to 4°, 8°, 12°, 16°, and 20°, of both sides (test positions). The results showed inhibtion in SHR area of the leg ipsilateral to the titing and facilitation of the contralateral SHR. These data indicate that, in man as in the decerebrate cat, tonic labyrinth reflexes act asymmetrically and that, in static condition, the vestibular syseral perturbation of upright position.