Weir J P, Evans S A, Housh M L
Program in Physical Therapy, University of Osteopathic Medicine and Health Sciences, Des Moines, IA 50312, USA.
J Orthop Sports Phys Ther. 1996 May;23(5):302-8. doi: 10.2519/jospt.1996.23.5.302.
During isokinetic knee testing, some subjects flex the trunk and contralateral knee during knee extension and the trunk and contralateral knee during knee flexion. This investigation assessed the effect of these extraneous movements on peak and constant joint angle torque (15 degrees below horizontal). Twenty-one subjects performed isokinetic knee extensions and flexions at 60, 180, and 300 degrees/sec under stabilized and nonstabilized conditions. The nonstabilized testing was performed with intentional trunk and contralateral leg movements. The stabilized condition resulted in greater torque values than the nonstabilized condition for extension and flexion for both peak torque and constant joint angle torque. The angle at which flexion peak torque occurred was further from full extension at 60 and 180 degrees/sec under the nonstabilized condition, while no differences were found for extension. These results indicate that extraneous movements can decrease torque output, which may be due to changes in muscle length caused by the extraneous movements.
在等速膝关节测试期间，一些受试者在膝关节伸展时会屈曲躯干和对侧膝关节，在膝关节屈曲时也会屈曲躯干和对侧膝关节。本研究评估了这些额外动作对峰值和恒定关节角度扭矩（低于水平15度）的影响。21名受试者在稳定和不稳定条件下，以60、180和300度/秒的速度进行等速膝关节伸展和屈曲。不稳定测试是在有意的躯干和对侧腿部动作下进行的。对于峰值扭矩和恒定关节角度扭矩，稳定条件下伸展和屈曲的扭矩值均高于不稳定条件。在不稳定条件下，60和180度/秒时屈曲峰值扭矩出现的角度离完全伸展更远，而伸展时未发现差异。这些结果表明，额外动作会降低扭矩输出，这可能是由于额外动作导致肌肉长度发生变化所致。
