Froese E A, Houston M E
J Appl Physiol (1985). 1985 Aug;59(2):309-14. doi: 10.1152/jappl.1985.59.2.309.
The relationship between torque-velocity characteristics of the knee extensors during isokinetic contractions and muscle fiber type of the vastus lateralis, determined from two muscle biopsy samples, was investigated in 12 male and 18 female subjects. Peak torque, corrected for the effect of gravity and impact artifact, was classified as corrected peak torque. The torque measured 30 degrees from full extension and, corrected for gravity, was classified as corrected torque at 30 degrees. No significant correlations were found between the percentage of fast-twitch fibers (%FT) or the relative area of FT fibers (%FTA) and corrected peak torque values for any of the velocities tested or the knee angles where corrected peak torques were measured. However, significant inverse relationships were determined for corrected torque at 30 degrees at all but the fastest velocity (270 degrees/s) and both %FT and %FTA for the male subjects. These results reveal that muscle fiber type of the vastus lateralis, based on duplicate muscle samples, is not related to the peak torque actually generated by the knee extensors but may influence the shape of the torque output for maximal contractions sustained over the entire range of motion.
在12名男性和18名女性受试者中，研究了等速收缩期间膝伸肌的扭矩 - 速度特性与通过两块肌肉活检样本确定的股外侧肌肌肉纤维类型之间的关系。针对重力和冲击伪影的影响进行校正后的峰值扭矩被分类为校正峰值扭矩。在距完全伸展30度处测量的扭矩，并针对重力进行校正后，被分类为30度处的校正扭矩。对于任何测试速度或测量校正峰值扭矩的膝关节角度，快肌纤维百分比（%FT）或FT纤维相对面积（%FTA）与校正峰值扭矩值之间均未发现显著相关性。然而，除了最快速度（270度/秒）外，男性受试者在30度处的校正扭矩与%FT和%FTA之间均确定存在显著的负相关关系。这些结果表明，基于重复肌肉样本的股外侧肌肌肉纤维类型与膝伸肌实际产生的峰值扭矩无关，但可能会影响在整个运动范围内持续的最大收缩时扭矩输出的形状。
