Division of Exercise and Sport Science, Institute of Food, Nutrition and Human Health, Massey University Albany, Private Bag 102-904, Auckland, New Zealand.
J Physiol Sci. 2011 Jan;61(1):31-6. doi: 10.1007/s12576-010-0118-7. Epub 2010 Nov 16.
Following eccentric exercise, increases in muscle length alter the length-tension relation of skeletal muscle. However, its unclear if this change occurs during eccentric exercise. Therefore, 70 eccentric actions of the knee extensors of one leg (with superimposed electrical stimulation) were performed at 100°/s, from full extension to full flexion. Angle-specific eccentric force was recorded throughout. Force decreased at all angles although this was non-uniform. At 70°, force decreased by 25%, whereas at 130°, force decreased by 41%. Initial peak force was recorded at 100° (590 ± 232 N); the exercise bout induced a 21% decrease in peak force and a 10° shift in the position of peak force production to 90°. The rightward shift in the muscle length-tension relation thus occurred during eccentric exercise, where greater force loss at short muscle lengths suggested an eccentric-induced over-stretching of sarcomeres.
在进行离心运动后，肌肉长度的增加会改变骨骼肌的长度-张力关系。然而，目前尚不清楚这种变化是否发生在离心运动过程中。因此，我们对一条腿的伸肌进行了 70 次 100°/s 的离心运动（同时施加电刺激），从完全伸展到完全弯曲。整个过程中记录了特定角度的离心力。尽管这种变化不均匀，但所有角度的力都减小了。在 70°时，力减少了 25%，而在 130°时，力减少了 41%。在 100°时记录到初始峰值力（590±232N）；运动过程导致峰值力下降 21%，峰值力产生的位置向 90°移动 10°。因此，肌肉长度-张力关系发生了右移，在离心运动中，较短肌肉长度下的较大力损失表明肌节受到了离心诱导的过度拉伸。
