Abstract
The human arm is a system of coupled mechanical oscillators. Its lowest resonance frequency coincides with the frequency of Parkinsonian tremor. In patients with Parkinson’s disease the pulse pattern of the nervous signal stimulating the muscles is pathologically shifted from 10 Hz in normals to lower frequencies and coincides then with the lowest and most dominant resonance frequency of the arm. The properties of the active muscular contraction add to the resonance effect of the passive arm mechanics. Both effects make the arm very sensitive to stimulations of about 5 Hz, thus leading to the high tremor amplitudes which characterize Parkinson’s disease.
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