하지운동 시 등받이의 각도가 복근과 요부 신전근의 활성도에 미치는 영향

The Effects of Varying Degrees of Backrest on Abdominal Muscles and Back Extensor Activation During Lower Extremity Exercise

The purpose of this study was to investigate the effects of backrests of varying degrees (90°, 100°, 110°) on three abdominal muscles (upper rectus abdominis, external oblique, internal oblique) and back extensor activation during lower extremity exercise. The three different conditions during bilateral knee extention exercise were: (1) leaning on a chair with a 90° backrest, (2) leaning on a chair with a 100° backrest, (3) leaning on a chair with a 110° backrest. Fifteen healthy muscle subjects (mean age=24.2 years [SD=2.96], mean height=175.6 ㎝ [SD=7.46], mean weight=69.1 ㎏ [SD=7.36]) with no history of neuromusculoskeletal disease voluntarily participated in this study. Electromyography was used to collect muscle activation, and the muscle activation was expressed as a percentage of maximal voluntary isometric contraction (%MVIC). Repeated one-way analysis of variance (ANOVA) was used to determine the statistical significance. The results were as follows: (1) upper rectus abdominis, external oblique, internal oblique activation measured significantly lower. (2) measured significantly lower when lower degree.