보행 시 백팩 부하에 따른 시·공간 변인, 몸통과 어깨 근육의 활동성과 피로도
Effects of Backpack Load on Spatiotemporal Parameters, Trunk and Shoulder Muscles Activity and Fatigue
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[서론] 본 연구의 목적은 보행 수행 시 백팩 부하 변화(0, 10, 20, & 30% BodyWeight(BW))에 따른 몸통과 어깨 근육의 활동성과 피로도, 시․공간 보행 변인의 변화를 분석하고자 하였다. [방법] 건강한 성인 남성 10명(연령: 26.9±2.2세, 키: 179±5.73cm, 체중: 76.2±5.8kg)이 연구에 참여하였다. 시․공간 보행 변인을 얻기 위해 카메라, 마커, Visual 3D 프로그램이 사용되었고, 위등세모근, 아래등세모근, 배곧은근, 척주세움근의 활동성과 피로도 분석을 위해 무선근전도 시스템이 사용되었다. 백팩 부하 변화에 따른 변인의 변화를 분석하기 위해 one-way repeated measures ANOVA가 사용되었고, 사후분석 검정으로 LSD 를 사용하였다. [결과] 백팩 부하 변화에 따라 시․공간 보행 변인은 통계적으로 유의한 변화를 나타내지 않았고, 아래등세모근의 활동성이 백팩 부하 변화에 따라 유의하게 변화하였다. 배곧은근과 척주세움근의 피로도가 백팩 부하 20%BW에서부터 유의하게 변화하였다. [결론] 20%BW 이상의 백팩 부하는 어깨 근육 보다는 몸통 근육인 배곧은근과 척주세움근에 피로를 유발시키는 것으로 나타나 백팩 디자인 시 고려되어야할 사항으로 생각되며, 오랜 시간 20%BW 이상의 부하로 보행을 하는 여행자나 군인들에게 배곧은근과 척주세움근의 강화가 필요할 것으로 사료된다.
Abstract
[INTRODUCTION] The purpose of the study was to investigate how different load weights(0, 10, 20, & 30% BodyWeight(BW)) affect spatiotemporal parameters in gait, trunk and shoulder muscles activity and fatigue. [METHOD] Ten healthy male subjects(Age: 26.9±2.2yrs, Height: 179±5.73cm, Weight: 76.2±5.8kg) were participated in the study. In order to get the spatiotemporal parameters, cameras, markers and Visual 3D program were used. The activity and fatigue in four muscles(Upper Trapezius, Lower Trapezius, Rectus Abdominis, & Erector Spinae) were analyzed with using Wireless EMG System. One-way repeated measures ANOVA and LSD(Post-Hoc) were used to analyze the effects of different load weights on spatiotemporal parameters, trunk and shoulder muscles activity and fatigue. [RESULT] Spatiotemporal parameters(velocity, step length, & stride length) did not show any significant difference. Lower Trapezius muscle showed significant differences on different load weights. The fatigues in Rectus Abdominis and Erector Spinae showed significant differences at over 20%BW load weights. [CONCLUSION] The backpack load in over 20%BW caused more fatigues of trunk muscles than shoulder muscles. Therefore, it might be considered in backpack design.
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