论文信息 - Acoustic- And Surface Electro-myography Of Human Jaw Elevator Muscles

Acoustic- And Surface Electro-myography Of Human Jaw Elevator Muscles

The acoustic myogram (AMG) was obtained from four jaw closer muscles at different levels of incisor bite force for 13 human subjects. AMGs and surface EMGs were obtained from anterior temporalis (bilateral) and masseter (bilateral) muscles at six levels of incisor bite force (0-30% Maximum voluntary contraction, or MVC). Each force level was maintained for 4 s; digitization occurred at 256/s. There was a nearly linear, or slightly curvilinear, positive relation between rms EMG and bite force. AMG amplitude (rms) increased to a maximum at a low force level and remained constant or decreased for higher forces. The AMG-tension relation for a muscle may depend upon the ratio of recruitment to firing rate control of tension.

R. N. Stiles | D. Pham

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