Influence of hip and knee positions on gluteus maximus and hamstrings contributions to hip extension torque production

作者：Jia Liu, Hsiang‐Ling Teng, David M. Selkowitz, Skulpan Asavasopon, Christopher M. Powers · 发表于：Physiotherapy Theory and Practice · 年份：2021 · DOI：10.1080/09593985.2021.1975338 · 被引用次数：5 · 研究领域：Knee injuries and reconstruction techniques、Sports injuries and prevention、Lower Extremity Biomechanics and Pathologies

BACKGROUND: Diminished gluteus maximus muscle strength has been proposed to be contributory to various lower-limb injuries. As such, it is of clinical importance to perform hip extensor strength testing in a position that biases torque contribution of the gluteus maximus relative to the other hip extensors (i.e. hamstrings). OBJECTIVES: To determine the relative torque contributions of the gluteus maximus and hamstring muscles in various hip extensor strength testing positions. METHODS: 13 Young, healthy participants performed maximum isometric hip extension on a dynamometer in 4 different positions that varied in terms of hip and knee flexion. Surface electromyography (EMG) was used to assess activation of gluteus maximus and hamstrings during the maximum isometric contractions. Normalized EMG data were used as an input to determine individual muscle contribution to hip extension torque production using SIMM modeling software. The gluteus maximus/hamstring torque contribution ratio was compared across the 4 positions using a one-way repeated-measures ANOVA. RESULTS: The highest gluteus maximus torque contribution value occurred in positions where the hip was flexed to 45°, while the highest hamstring torque contribution occurred in positions in which the knee was fully extended. The gluteus maximus/hamstring torque contribution ratio was highest at 0° of hip extension and 90° of knee flexion. CONCLUSION: Testing isometric hip extensor strength at 0° of hip extension and 90° ...