EMG 지표로 설정된 등척성 운동강도에 따른 중대뇌동맥 혈류속도 변화 (The Changes of Middle Cerebral Artery Blood Flow Velocity according to the EMG-based Intensity of Maximal Voluntary Contraction (MVCEMG))

서지정보

· 발행기관 : 한국사회체육학회
· 수록지 정보 : 한국사회체육학회지 / 74호 / 609 ~ 618페이지
· 저자명 : 이희혁, 김성대, 오명진, 정일규

초록

The purpose of this study is to evaluate the influence and adatpability as the intensity index of MVCEMG on middle cerebral velocity (MCA Vmean) during isometric strength type exercise. Fourteen healthy mael (24.1± 1.4yrs) were asked to perform the 45°knee extension isometric ocntraction for 60 seconds. In random o-r der, all participants performed three times the isometric exercise of 100%, 80% and 60% MVC determined by root mean square (RMS) of EMG at right rectus femoris muscle with a week interval. Each participant was asked to conduct and maintain the predetermined exact intensity of %M VCEMG confirming the figures on a monitor .
MCA Vmean was measured at rest, during exercise, immediately after exericse, 30 seconds recovery, 60 seconds recovery and 2 minutes recovery using transcranial-Dopple rsonography. All data were analyzed using two-way ANOVA (3 intensities x 6 times) with repeated measure sT. he results of this study are as follows. 1) MCA Vmean in 80% MVCEMG was significantly higher than MCA Vmean in 60% MVCEMG (110±19 vs. 89±19 cm/ s, p<.05) immediately after exercise. 2) MCA Vmean in 100% MVCEMG was significantly higher than MCA Vmeanat 60% MVCEMG in 30 second recovery (97±14 vs. 77±10cm/s, p<.05) and 60 seconds recovery (97±16 vs. 73 ±12cm/s, p<.05). 3) Heart rate in 100% MVCEMG was significantly higher than that in 80%, 60% MVCEMG at immediately after exercise (128±26 vs. 106±15, 97±10 beats/min, p<.01) and at 30 second recovery (102±18 vs. 87±12, 80±9 beats/min, p<.05). In this study, we found that isometric exercise intensit yup to ~ 80% o f MVCEMG might induce the elevation of MCAVmean during exertion and the increase of MCAVmean at 80% exercise intensity might be higher than that of the maximal isometric intensity.

영어초록

The purpose of this study is to evaluate the influence and adatpability as the intensity index of MVCEMG on middle cerebral velocity (MCA Vmean) during isometric strength type exercise. Fourteen healthy mael (24.1± 1.4yrs) were asked to perform the 45°knee extension isometric ocntraction for 60 seconds. In random o-r der, all participants performed three times the isometric exercise of 100%, 80% and 60% MVC determined by root mean square (RMS) of EMG at right rectus femoris muscle with a week interval. Each participant was asked to conduct and maintain the predetermined exact intensity of %M VCEMG confirming the figures on a monitor .
MCA Vmean was measured at rest, during exercise, immediately after exericse, 30 seconds recovery, 60 seconds recovery and 2 minutes recovery using transcranial-Dopple rsonography. All data were analyzed using two-way ANOVA (3 intensities x 6 times) with repeated measure sT. he results of this study are as follows. 1) MCA Vmean in 80% MVCEMG was significantly higher than MCA Vmean in 60% MVCEMG (110±19 vs. 89±19 cm/ s, p<.05) immediately after exercise. 2) MCA Vmean in 100% MVCEMG was significantly higher than MCA Vmeanat 60% MVCEMG in 30 second recovery (97±14 vs. 77±10cm/s, p<.05) and 60 seconds recovery (97±16 vs. 73 ±12cm/s, p<.05). 3) Heart rate in 100% MVCEMG was significantly higher than that in 80%, 60% MVCEMG at immediately after exercise (128±26 vs. 106±15, 97±10 beats/min, p<.01) and at 30 second recovery (102±18 vs. 87±12, 80±9 beats/min, p<.05). In this study, we found that isometric exercise intensit yup to ~ 80% o f MVCEMG might induce the elevation of MCAVmean during exertion and the increase of MCAVmean at 80% exercise intensity might be higher than that of the maximal isometric intensity.

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