Frequency stabilization in the motor centers of spinal cord and caudal brain stem

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Abstract
In man, cat, and dog the frequency of discharge of the single motor unit is almost completely independent of the mechanical tension developed. The stabilized frequency is significantly different according to the position of the motor nuclei along the cerebrospinal axis, increasing from the caudal to the cranial end. This frequency gradient appears to be inborn. The recurrent inhibition and the silent period have different durations in the various muscle groups. A correspondence has been found between the frequency of discharge of the motor unit and the reciprocal of recurrent inhibition. It is concluded that the stabilization in frequency is characteristic for all motor units and may depend on a negative feedback mechanism based on recurrent inhibition.

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