活动范围的减小可以增加人体膝关节伸肌的最大自主偏心力。

H M Holder-Powell, O M Rutherford
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引用次数: 12

摘要

本研究的第一部分使用KinCom 500H等速测力仪测量了4名受试者双腿人体膝关节伸肌在-1.57(偏心)和3.67(同心)rad x s(-1)(-90和210度s(1))之间的力-速度关系曲线特征。与最大自主等距力相比,在0.52 rads x s(-1)(30°s(-1))时,偏心活动的力产生显著增加,而在1.57 rads x s(-1)(90°s(-1))时则没有显著增加(P < 0.005)。然而,这一增加比经典的力-速度关系所预期的要低。研究的第二部分考察了限制运动范围是否能够进一步增加偏心力。在另外6名受试者中,在80度(15-95度屈曲)和50度(45-95度屈曲)的运动范围内重复偏心收缩。在较短的运动范围内,力的显著增加为0.52 rad x s(-1)(30°s(-1)) (P = 0.006)和1.57 rad x s(-1)(90°s(-1)) (P < 0.001)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reduction in range of movement can increase maximum voluntary eccentric forces for the human knee extensor muscles.

Using the KinCom 500H isokinetic dynamometer the first part of this study measured the characteristics of the force velocity relationship curve for the human knee extensors between -1.57 (eccentric) and 3.67 (concentric) rads x s(-1) (-90 and 210 degrees s(1)) for both legs in 4 subjects. A significant increase in force generation was seen in eccentric activity at 0.52 rads x s(-1) (30 degrees s(-1)) but not at 1.57 rads x s(-1) (90 degrees s(-1)) compared to maximum voluntary isometric force (P < 0.005). This increase was, however, lower than would be expected from the classical force-velocity relationship. The second part of the study examined whether restricting the range of movement was able to further increase the eccentric forces. In a further 6 subjects, the eccentric contractions were repeated during either an 80 degrees (15-95 degrees flexion) and a 50 degrees (45-95 degrees flexion) range of movement. Significant increases in force were seen over the shorter range of movement at 0.52 rads x s(-1) (30 degrees s(-1)) (P = 0.006) and 1.57 rads x s(-1) (90 degrees s(-1)) (P < 0.001).

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