目的 分析健康人群躯干屈肌和伸肌在等速运动中的力学变化。 方法 2018年3月至9月，选取27例健康受试者，收集其在30°/s、60°/s和90°/s角速度下躯干屈伸肌群的峰力矩。 结果 受试者躯干屈曲和伸展峰力矩随着速度的增大略微减小，但无显著性差异(F < 2.070, P > 0.05)。30°/s和60°/s时，伸展峰力矩明显大于屈曲(t > 3.138, P < 0.01)；90°/s时，屈曲与伸展峰力矩无显著性差异(t = -0.946, P > 0.05)。屈曲和伸展峰力矩在30°/s和60°/s时比值均约为0.79∶1。相同速度下第2次和第10次收缩时峰力矩比较，屈曲峰力矩均下降，但只有30°/s时有非常显著性差异(t = 5.159, P < 0.01)；伸展峰力矩均增加，但只有60°/s时有显著性差异(t = -2.142, P < 0.05)。 结论 等速运动角速度在60°/s以下时，躯干屈肌和伸肌肌力存在差异，且在30°/s和60°/s角速度下，两者比值约相等。
Objective To study the presentation and changes of trunk flexors and extensors in isokinetic training at different velocities. Methods From March to September, 2018, 27 health volunteers were enrolled. Their peak torques of trunk flexors and extensors at 30°/s, 60°/s, and 90°/s were collected. Results The peak torques of trunk flexors and extensors slightly decreased with the increasing of velocities, but no significant difference was found (F < 2.070, P > 0.05). At 30°/s and 60°/s, the peak torque of extensors was higher than that of flexors (t > 3.138, P < 0.01); at 90°/s, no significant difference was found in the peak torque between flexors and extensors (t = -0.946, P > 0.05). The ratios of the peak torque of flexors to extensors were 0.79∶1 both at 30°/s and 60°/s. The peak torque of flexors decreased in the tenth contraction compared with the second contraction at all the angular velocities, however, it was significantly different only at 30°/s (t = 5.159, P < 0.01); meanwhile, the peak torque of extensors increased with significance only at 60°/s (t = -2.142, P < 0.05). Conclusion At 30°/s and 60°/s, there might be a linear relation between trunk flexors and extensors, and the peak torque ratios of trunk flexors to extensors were approximately the same.
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