코어운동 Bolster의 적용자세와 움직임에 따른 체간 심부근과 운동근의 근전도 반응
EMG Responses of Trunk Deep Stabilizing and Mobilizing Muscles by Several Position and Movement Using Core Exercise Bolster
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[서론] 본 연구의 목적은 와위와 좌위의 자세에서 코어운동 도구인 불안정 Bolster를 적용하거나 이용하여 움직임을 수행하는 동안 체간 심부근과 운동근의 근전도 반응을 측정하여 불안정 운동 도구의 효과는 분석하는 데 있다. [방법] 본 연구에서는 남자 대학 생 15명(23.0±2.5yrs, 176.4±5.4cm, 73.1±11.0kg)을 연구대상으로 하여, 와위 평지 1가지, on-Bolster 5가지, 좌위 평지 1가지, on-Bolster 4가지 조건에 대해 각각 20초씩 무선할당하여 근전도를 측정하였다. 체간 심부근은 복횡근-내복사근과 중둔근을, 운동근은 복직근과 대퇴직근을 대상으로 표면전극을 이용하여 근활성도를 RMS로 측정하였다(LXM3208-RF, LAXTHA, Korea). 기준 수축(RVC)을 측정하고 표준화하여 분석하였다. 일원변량분석(Oneway ANOVA)을 실시하였고 post hoc을 실시하였다. [결과] 와위에서 6가지 자세 및 움직임에 대한 근전도를 비교한 결과, 4가지 근육의 RMS는 동작간 유의한 차이가 나타났다(p<0.01). 대부분의 근육에서 와위 non-Bolster stable보다 on-Bolster stable과 on-Bolster tiny rocking에서 RMS가 높게 나타났다. 좌위 5가지 자세를 비교한 결과, 복횡근-내복사근, 중둔근 및 대퇴직근에서 유의한 차이가 나타났다(p<0.05, p<0.01). non-Bolster stable보다 tiny rocking과 rolling에서의 RMS가 다소 높게 나타났다. [결론] 와위에서는 4가지 근육 모두에서, 좌위에서는 3가지 근육에서 자세와 동작 간에 RMS에 유의한 차이가 나타났다. 와위에서는 4가지 supine non-Bolster posture보다 tiny movement에서 체간 심부근은 운동근보다 상대적으로 근활성도가 더 증가하나, 운동근 중 복직근은 Bolster rolling buttocks에서 현저한 근활성도 증가가 나타났다. Bolster를 이용하여 좌위에서 미동이나 운동 동작을 수행하는 경우, 체간 심부근과 운동근의 RMS가 약 10~40% 정도 증가하였다. 향후 연구에서는 남녀 모두와 다양한 연령층을 대상으로 하여 상체와 하체의 여러 가지 자세와 동작이 다양한 체간 심부근과 운동군 등에 미치는 영향, 근관절 질환자 등을 위한 효과 등으로 적용할 수 있겠다.
Abstract
[INTRODUCTION] The purposes of this study were to measure EMG responses of trunk deep stabilizing and mobilizing muscles by several posture and movement using unstable Bolster, and to analyze the effects of the unstable exercise instrument. [METHOD] The subjects were 15 college men. The subjects were participated supine 6 posture and movements, sitting 5 posture and movements for 20 seconds each by random order. EMG responses were measured by RMS(root mean square) on trunk deep stabilizing muscles(transversus abdominis & obliques abdominis internus, and gluteus medius), and mobilizing muscles(rectus abdominis, and rectus femoris) with surface electrode. RVS(reference voluntary contraction) were measured and analysed after standardization. Oneway ANOVA and post hoc were applied. [RESULTS] As the results of comparison about EMG responses on unstable Bolster posture and movements, there were significant difference on RMS of 4 muscles(p<0.01). RMS of supine unstable Bolster posture and Bolster movements were higher than that of non-Bolster posture on almost of muscles. On comparison among 5 sitting unstable Bolster posture and movements, there were significant difference on 3 muscles(p<0.05, p<0.01). RMS of sitting unstable Bolster tiny movements were some higher than that of non-Bolster posture on 3 muscles. [CONCLUSION] On all of 4 muscles on supine positions, and 3 muscles on sitting positions, there were significants difference on RMS of postures and movements. On supine conditions, RMS of trunk deep stabilizing muscles were relatively higher than those of mobilizing muscles on tiny movement rather than supine non-Bolster posture, but those of rectus abdominis were very higher on Bolster rolling buttocks. In case of tiny movements and exercise movements using unstable Bolster, RMS of trunk deep stabilizing and mobilizing muscles were increased about 10~40%. The future researches may include that the effects of variety posture and movements of upper and lower body to trunk deep stabilizing and mobilizing muscles, and the effects for muscloskeletal disease.
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