Abstract
This paper deals with our analysis and examination of the standing posture.1. Romberg, Mann, and one-leg tests were useful not only to demonstrate the degree of equilibrium disturbance but also to differentiate labyrinthine equilibrium disturbance from cerebellar ataxia.2. Stabilometry with computer analysis of the sway of the body's center of gravity was useful to record sway in the standing posture and to demonstrate peculiarities of equilibrium disturbances due to disorders of the labyrinth, cerebellum, basal ganglia, and cervical spinal cord.3. Analysis with a feedback model of interactions between sway of the head and the nuchal muscle activity (labyrinthine righting system) and between sway of the body's center of gravity and activity of the soleus muscle (proprioceptive righting system) was useful to demonstrate characteristics of the labyrinthine and proprioceptive controls which act to maintain the standing posture.4. Evoked electromyograms induced by the stimulation of the labyrinth appeared in the muscles of the gluteal and femoral regions and the legs. These muscle activities were varied with changes in head postition indicating that vestibulospinal reflexes are modulated by input from the neck proprioceptors.All kinds examinations related to standing posture are nesessary to clarify the mechanism of control of standing posture and to examine static equilibrium in clinical practice.
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