렛 풀 다운 운동 시 그립너비와 그립방향이 상지의 근육활성도에 미치는 영향
Effects of grip width and hand orientation on muscle activities of upper body during the lat pull-down
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[목적] 본 연구는 렛 풀 다운 운동 시, 그립너비(어깨 넓이의 50%, 100%, 150%)와 그립방향(회내 그립, 회외 그립)이 8가지 상지 근육(넓은등근, 큰가슴근, 가시아래근, 위팔두갈래근, 위팔세갈래근, 배곧은근, 척추세움근, 중간등세모근)에 미치는 영향을 규명하는 것이다. [방법] 본 연구의 목적을 달성하기 위하여 12개월 이상 웨이트트레이닝을 경험한 S시 소재의 C대학교에 재학 중인 신체 건강한 20대 남자대학생 8명을 선정하였다. 연구대상자들은 6가지 그립 방법(회내 50%, 회내 100%, 회내 150%, 회외 50%, 회외 100%, 회외 150%)을 무작위로 선택하여 1RM의 70% 무게를 이용하여 5회 반복 시도하였다. 각 근육의 그립너비와 그립 방향(3×2)에 따른 차이 검증을 위해 반복측정 이원분산분석을 활용하였고, 사후 검정은 Tukey을 실시하였다. [결과] 넓은등근의 근 활성도에서 그립너비 50%에 비해 100%에서 유의하게 더 크게 나타났다. 큰가슴근과 배곧은근의 근 활성도에서 그립너비 50%는 150%에 비해, 100%는 150%에 비해 유의하게 더 크게 나타났다. 중간등세모근의 근 활성도에서 그립너비 50%에 비해 150%에서 유의하게 더 크게 나타났다. [결론] 렛 풀 다운 운동 시 몸통의 뒤쪽에 위치하고 있는 넓은등근과 중간등세모근은 그립너비를 넓게 잡았을 때 근 활성도가 더 높게 나타났고, 몸통의 앞쪽에 위치하고 있는 큰가슴근과 배곧은근은 그립을 좁게 잡았을 때 근 활성도가 더 높게 나타났다.
Abstract
[Purpose] The purpose of this study is to investigate the effects of grip width and hand orientation on muscle activities of upper body during the lat pull-down. [Methods] Eight healthy men performed the 6 grip variations (3 grip width × 2 hand orientation) using an experimentally determined load of 70% of 1 repetition maximum. Five trials were analyzed for each grip type. Participants maintained a cadence of 2-second concentric and 2-second eccentric phases. The grip widths were normalized for each individual by using their biacromial diameter (100%), and then set the grip width 50% of biacromial diameter and 150% of biacromial diameter. Surface EMG of the latissimus dorsi, pectoralis major, infraspinatus, biceps brachii, triceps brachii, rectus abdominis, erector spinae and middle trapezius was recorded, and the root mean square of the EMG was normalized, using a maximum isometric voluntary contraction. [Results] Latissimus dorsi showed higher muscle activities in 100% grip width than those of 50% grip width. Pectoralis major and rectus abdominis showed higher muscle activities in 50% and 100% grip width than those of 150% grip width. Middle trapezius showed higher muscle activities in 150% grip width than those of 50% grip width. [Conclusions] Two-way repeated measures ANOVA for each muscle revealed that latissimus dorsi and middle trapezius (the posterior muscles of trunk) showed higher muscle activities in wide grip, on the other hand, pectoralis major and rectus abdominis (the posterior muscles of trunk) showed higher muscle activities in narrow grip.
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