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(Received IN HUMAN MOTOR Missouri â? Research Trust, Kirksville, for publication January 23, 1948) INTRODUCTION contraction in human limb muscles Lindsley (4) found the shortest interval between two successive responses to be 22 msec. This is in sharp contrast to the observations of Hoff and Grant (3) who found of single motor in the cat with intervals between successive beats as short as 2.5 msec., and to similar observations in our laboratory of in human muscle with intervals down to 3.5 msec. The present studies were undertaken since these imply excitation and recovery mechanisms which are quite different from the relatively slow single rhythms which are usually seen. METHODS IN MAXIMUM steady voluntary Needle electrodes, enameled except for a small bare area at the tip, were neighboring intradermal needles. Single motor in the muscles shown were activated by very mild steady voluntary contraction or, in the trapezius, scratches. Recording methods have been previously described (1). I I paired with in Table 1 by light pin SPâNA& EXTENS â tT2- w UNlTS . SINGLE DISCHARGE I5 TRAPEZIUS 81 CEP S TRICEPS GLUT#l GASTROCNEMIUS SPINAL EXTENSOR5 ($âLI 1 DISCHARGE 8 Table 1. See Text. RESULTS Criteria for identifying . A
Journal of Neurophysiology – The American Physiological Society
Published: May 1, 1948
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