Godfrey K E, Kindig L E, Windell E J
Arch Phys Med Rehabil. 1977 Mar;58(3):132-5.
The external oblique, rectus abdominis, and rectus femoris muscles of 17 college women were studied electromyographically in 8 sit-up variations to determine the best variation for maximizing abdominal muscle activity and minimizing hip flexor activity. Integrated action potentials and movement phases of each variation were recorded simultaneously. The duration of muscle activity within the movement phases was analyzed. The variables of hook-lying/long-lying, feet supported/feet unsupported, and slow/fast speed of performance were examined. The hook-lying unsupported slow and fast variations were best for maximizing abdominal muscle duration of activity and for minimizing rectus femoris muscle duration of activity. Greatest duration of activity for all muscles occurred in the long-lying supported fast variation. Supporting the feet in both hook and long-lying fast variations was more effective for increasing activity duration of all muscles than the slow supported variations. Speed of performance seemed to be as important as support of the feet or leg position in increasing duration of muscle activity.
对17名大学女生的腹外斜肌、腹直肌和股直肌进行了肌电图研究，涉及8种仰卧起坐变体动作，以确定能使腹部肌肉活动最大化且髋屈肌活动最小化的最佳变体动作。同时记录每种变体动作的积分动作电位和运动阶段。分析了运动阶段内肌肉活动的持续时间。研究了钩卧/长卧、双脚支撑/无双脚支撑以及慢速/快速执行速度等变量。钩卧无支撑慢速和快速变体动作最有利于使腹部肌肉活动持续时间最大化，并使股直肌肌肉活动持续时间最小化。所有肌肉活动持续时间最长的情况出现在长卧支撑快速变体动作中。在钩卧和长卧快速变体动作中支撑双脚，比慢速支撑变体动作在增加所有肌肉的活动持续时间方面更有效。在增加肌肉活动持续时间方面，执行速度似乎与双脚支撑或腿部位置同样重要。
