The relation between physiological tremor and the 13-Hz oscillations of the arm muscles.

In a previous article the author has demonstrated regular 13-Hz oscillations of the bellies of the arm muscles during isometric contractions. In this research these experiments were extended with the study of physiological tremor by application of an accelerometer on the wrist. During repeated isometric and faradic contractions of the arm muscles, an harmonic relation between this physiological tremor and the 13-Hz oscillations was proved. Also it is plausible to consider these 13-Hz oscillations as the primary origin of the physiological tremor.