Title :
Pulse train frequency demodulation by a muscle-load system
Author :
Stiles, R.N. ; Hahs, D.W.
Author_Institution :
Dept. Physiol. & Biophys., Tennessee Univ., Memphis, TN, USA
Abstract :
An important question in motor control is how low-pass filtering by a muscle-load system is divided between the active state process and muscle-load mechanics. The authors obtained the frequency response of a muscle-load system (treated as a single motor unit) using a low-rate pulse-train stimulus. Load acceleration twitches were detected and RMS displacements calculated from power spectra. Frequency response and other mechanical data indicate third-order, linear mechanics, in combination with active state pulses of about 20-ms duration. Comparable results were obtained for an intact muscle-limb system of man, using RMS displacements and surface EMG amplitude ratios obtained at different frequencies of voluntary oscillation.<>
Keywords :
biomechanics; muscle; RMS displacements; active state process; frequency response; intact muscle-limb system; load acceleration twitches; low-pass filtering; low-rate pulse-train stimulus; man; motor control; muscle-load mechanics; muscle-load system; power spectra; pulse train frequency demodulation; surface EMG amplitude ratios; third-order linear mechanics; voluntary oscillation;
Conference_Titel :
Engineering in Medicine and Biology Society, 1988. Proceedings of the Annual International Conference of the IEEE
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-7803-0785-2
DOI :
10.1109/IEMBS.1988.94848
