Leg Crossing-Induced Asymmetrical Trunk Muscle Activity During Seated Computer Work

• 발행기관: 한국전문물리치료학회
• 저자명: Yeon-gil Chung Yong-wook Kim Jong-hyuck Woen Chung-hwi Yi Hye-seon Jeon Oh-yun Kwon
• 간행물 정보: 『한국전문물리치료학회지』한국전문물리치료학회지 제15권 제4호, 80~86쪽, 전체 7쪽
• 주제분류: 의약학 > 의학일반
• 파일형태: PDF
• 발행일자: 2008.11.30

영문 초록

Cross-legged sitting postures are commonly assumed during computer work. The purpose of this study was to determine the effects of leg crossing on trunk muscle activity while typing at a computer. Trunk muscle activity was measured in three 8 different sitting postures, in random order. These posture were: mormal sitting with a straight trunk and both feet on the floor (NS), upper leg crossing (ULC), and ankle on knee (AOK). The right leg was crossed onto the left leg in both cross-legged postures. Twenty able-bodied male volunteers participated in this study. Subjects typed on a computer keyboard for one minute. Surface electromyography (EMG) was used to record bilateral muscle activity in the external oblique (EO), internal oblique (IO), and rectus abdominis (RA). The EMG activity of each muscle in the NS posture was used as a reference (100% EMG activity) in relation to the two cross-legged postures. Muscle activity in the right EO, right IO, and left IO was significantly lower in the ULC posture than in the NS posture. In contrast, muscle activity in the right RA was significantly higher in the ULC posture than in the NS posture. Muscle activity in the right RA was significantly higher in the AOK posture, as compared to the NS posture, whereas activity in the left Io was significantly lower in the AOK posture, as compared to the NS posture. The right-left muscle activity ratios in the EO and IO showed significantly different patterns in the cross-legged postures, suggesting that asymmetrical right-left oblique muscle activity gad occurred.

키워드

Computer work Cross-legged sitting postures Electromyography Trunk muscle