Tis L L, Perrin D H, Weltman A, Ball D W, Gieck J H
Department of Kinesiology and Health, Georgia State University, Atlanta 30303.
Med Sci Sports Exerc. 1993 Sep;25(9):1038-43.
The purposes of this study were to compare the effects of two preload settings (0 N, 75 N) and two ranges of motion (5-90 degrees ROM, 25-70 degrees ROM) on torque output of the knee musculature. Twenty females were randomly assessed for isokinetic concentric (CON) and eccentric (ECC) torque of the knee extensor (EXT) and flexor (FLEX) musculature at a velocity of 1.62 rads.s-1. Two four-way ANOVAs (muscle x mode x range of motion x preload) revealed significant differences in average torque between the preload and range of motion conditions (CONEXT: 5-90 degrees ROM, 75 N = 74.3 +/- 17.2 Nm; 5-90 degrees ROM, 0 N = 68.3 +/- 17.2 Nm; 25-70 degrees ROM, 75 N = 79.0 +/- 13.0 Nm; 25-70 degrees ROM, 0 N = 71.5 +/- 20.8 Nm) (ECCEXT: 5-90 degrees ROM, 75 N = 85.6 +/- 28.6 Nm; 5-90 degrees ROM, 0 N = 82.8 +/- 27.8 Nm; 25-70 degrees ROM, 75 N = 97.7 +/- 23.4 Nm; 25-70 degrees ROM, 0 N = 93.6 +/- 26.5 Nm) (CONFLEX: 5-90 degrees ROM, 75 N = 43.5 +/- 9.2 Nm; 5-90 degrees ROM, 0 N = 43.1 +/- 5.6 Nm; 25-70 degrees ROM, 75 N = 44.2 +/- 8.9 Nm; 25-70 degrees ROM, 0 N = 41.2 +/- 8.9 Nm) (ECCFLEX: 5-90 degrees ROM, 75 N = 56.7 +/- 16.3 Nm; 5-90 degrees ROM, 0 N = 55.6 +/- 17.8 Nm; 25-70 degrees ROM, 75 N = 57.3 +/- 14.0 Nm; 25-70 degrees ROM, 0 N = 51.8 +/- 14.0 Nm) (P < 0.05). No differences in peak torque values were observed. Based on the findings of this study, preload and range of motion should remain constant between and among subjects if average torque is used as a criterion measure.
本研究的目的是比较两种预负荷设置（0 N、75 N）和两个运动范围（5 - 90度活动度、25 - 70度活动度）对膝关节肌肉扭矩输出的影响。随机选取20名女性，以1.62弧度·秒⁻¹的速度对其膝关节伸肌（EXT）和屈肌（FLEX）肌肉进行等速向心（CON）和离心（ECC）扭矩评估。两项四因素方差分析（肌肉×模式×运动范围×预负荷）显示，预负荷和运动范围条件之间的平均扭矩存在显著差异（向心伸肌：5 - 90度活动度，75 N = 74.3 ± 17.2 N·m；5 - 90度活动度，0 N = 68.3 ± 17.2 N·m；25 - 70度活动度，75 N = 79.0 ± 13.0 N·m；25 - 70度活动度，0 N = 71.5 ± 20.8 N·m）（离心伸肌：5 - 90度活动度，75 N = 85.6 ± 28.6 N·m；5 - 90度活动度，0 N = 82.8 ± 27.8 N·m；25 - 70度活动度，75 N = 97.7 ± 23.4 N·m；25 - 70度活动度，0 N = 93.6 ± 26.5 N·m）（向心屈肌：5 - 90度活动度，75 N = 43.5 ± 9.2 N·m；5 - 90度活动度，0 N = 43.1 ± 5.6 N·m；25 - 70度活动度，75 N = 44.2 ± 8.9 N·m；25 - 70度活动度，0 N = 41.2 ± 8.9 N·m）（离心屈肌：5 - 90度活动度，75 N = 56.7 ± 16.3 N·m；5 - 90度活动度，0 N = 55.6 ± 17.8 N·m；25 - 70度活动度，75 N = 57.3 ± 14.0 N·m；25 - 70度活动度，0 N = 51.8 ± 14.0 N·m）（P < 0.05）。未观察到峰值扭矩值存在差异。基于本研究的结果，如果将平均扭矩用作标准测量指标，则受试者之间及内部的预负荷和运动范围应保持恒定。
