근피로가 교근 부위의 감각역치 및 교근 휴지기에 미치는 영향
Effect of Muscle Fatigue on Sensory Thresholds of Masseteric Area and Silent Period of Masseter Muscle
김만수, 최경옥, 신은미,
소속 상세정보
김만수 ( ) - 강릉대학교 치과대학 구강내과.진단학
최경옥 ( ) - 강릉대학교 치과대학 구강내과.진단학
신은미 ( ) - 강릉대학교 치과대학 구강내과.진단학
KMID : 0355220020270010107
Abstract
This study was performed to investigate the effect of experimentally induced muscle fatigue on pressure pain threshold(PPT). current perception threshold(CPT), and silent period(SP). Eight healthy volunteers(24.9+0.6 yrs old) without past history of present symptoms of orofacial pain were participated. PPTs and CPTs of masseteric area, and SPs of masseter muscle were recorded before and after sustained isometric contraction at 60% level of maximum voluntary contraction of electromyographic activity. SPs were measured under controlled muscle contraction level (0.6mV) and constant current stimulation (15mA). After the sustained isometric contraction, PPTs were significantly decreased (p<0.01), but CPTs and SPs were not significantly different. These results suggest that fatigue of masseter muscle affects locally on the muscle and its neuromuscular junction area, but does not affect nociceptive reflex of masseter muscle and current perception thresholds of masseteric area.
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