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Comparative physiological study demonstrates that sinusoidal ankle rotation quantifies muscle tone and hyperreflexia in spastic patients, indicating strong correlation with clinical severity.
Sinusoidally modulated torque was applied to rotate the ankle joint of normal subjects and clinically spastic patients. Measurements were made of the effective joint compliance and of the evoked EMG activity. These procedures provide a well-quantified and reliable measure of muscle tone and hyperreflexia which is well correlated with the patient's clinical status.
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Gottlieb et al. (1978) studied this question.
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