Abstract
The sensory input of the foot has an important influence on balance. In patients with Morbus Parkinson (PD-patients) balance control is often impaired. Therefore, the aim of this study was to quantify the sensitivity of the plantar foot in PD-patients. Five sites of the plantar foot were examined in 24 PD-patients and in 20 controls using Semmes-Weinstein Monofilaments for touch pressure and a vibration-exciter (30 Hz) for vibration. The results show significantly higher thresholds in PD-patients. For each tested location (except the heel) the thresholds are at least twice as high as in controls. Moreover, this study proved the correlation between motor and somatosensory systems: the stronger the motor deficiencies in PD-patients (Unified Parkinson's Disease Rating System score) the higher the sensitivity thresholds for vibration. In conclusion, reduced sensitivity of the plantar foot may contribute to impaired balance control.
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