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How Does Calf-muscle Fatigue and Age Affect Vibration-perturbed One-leg Stance?

This study investigated the effect of muscle fatigue on vibration-perturbed one-leg stance in healthy young and older women. Force-plate measurements were obtained before and up to 15 min after fatiguing exercise of one leg. The study indicates an immediate but short-lasting effect of fatiguing exercise on vibration-induced centre of pressure (CP) oscillations in terms of increased amplitude. It also indicates that the influence of fatiguing exercise on the CP movements over time differs between young persons (20-26 years of age) and older persons (50-60 years of age). The normal learning effect due to repeated one-leg stance was not disturbed by the fatiguing exercise in the group of older persons in our study regarding sagittal CP velocity and frontal amplitude which was the case in the group of young persons. These results raise questions regarding postural control strategies and interpretation of force-plate data. Fatiguing exercise did not influence the shift of CP caused by vibration thus indicating unchanged excitability of muscle spindles in fatigued muscles.