Hefzy M S, al Khazim M, Harrison L
Department of Biological & Medical Research, King Faisal Specialist Hospital and Research Center, Riyadh, Kingdom of Saudi Arabia.
Biomed Sci Instrum. 1997;33:360-5.
The anterior lunge exercise is a closed chain kinetic exercise that has been developed to improve the function of the lower limb and to strengthen the hamstrings and quadriceps, simultaneously. In this study, a three-dimensional biomechanical analysis of this exercise was conducted in order to understand the mechanics of this rehabilitation activity. Experimental conditions were recorded using an active optoelectronic kinematic data capture system (OPTOTRAK), two force plates (AMTI) and electromyography (EMG). Data were collected from healthy male subjects while performing several lunges. When the distance between the toe of the rear leg and the heel of the front leg (lunging distance) was maximum, a large net flexion moment was predicted in the front leg in the extented position. This moment was reversed to a large net extension moment in the flexed position. A large increase in the net extension moment in the rear leg was also predicted as the front knee was bent from 5 degrees to 90 degrees of flexion. These data suggest that quadriceps and hamstring muscles co-contraction occur during a maximum lunge in the front leg when it is in the flexed position.
前弓步练习是一种闭链动力练习，其目的在于同时改善下肢功能并强化腘绳肌和股四头肌。在本研究中，为了解该康复活动的力学原理，对该练习进行了三维生物力学分析。使用主动式光电运动学数据采集系统（OPTOTRAK）、两个测力板（AMTI）和肌电图（EMG）记录实验条件。在健康男性受试者进行多次弓步动作时收集数据。当后腿脚趾与前腿脚跟之间的距离（弓步距离）最大时，预测处于伸展位置的前腿会出现较大的净屈曲力矩。该力矩在屈曲位置时转变为较大的净伸展力矩。当在前膝从5度屈曲至90度时，预测后腿的净伸展力矩也会大幅增加。这些数据表明，在前腿处于屈曲位置进行最大幅度弓步时，股四头肌和腘绳肌会共同收缩。
