Oklahoma State University, Health and Human Performance, Stillwater, Oklahoma, USA.
Int J Sports Med. 2011 Dec;32(12):935-9. doi: 10.1055/s-0031-1283184. Epub 2011 Nov 17.
The purpose of the present study was to examine the effects of an acute bout of eccentric exercise on maximal isokinetic concentric peak torque (PT) of the leg flexors and extensors and the hamstrings-to-quadriceps (H:Q) strength ratio. Sixteen male (mean±SD: age=20.9±2 years; stature=177.0±4.4 cm; mass=76.8±10.0 kg) volunteers performed maximal, concentric isokinetic leg extension and flexion muscle actions at 60°·sec - 1 before and after (24-72 h) a bout of eccentric exercise. The eccentric exercise protocol consisted of 4 sets of 10 repetitions for the leg press, leg extension, and leg curl exercises at 120% of the concentric one repetition maximum (1-RM). The results indicated that the acute eccentric exercise protocol resulted in a significant (P<0.05) decrease in isokinetic leg flexion (13-19%) and leg extension (11-16%) PT 24-72 h post-exercise. However, the H:Q ratios were unaltered by the eccentric exercise protocol. These findings suggest that an acute bout of eccentric exercise utilizing both multi - and single - joint dynamic constant external resistance (DCER) exercises results in similar decreases in maximal isokinetic strength of the leg flexors and extensors, but does not alter the H:Q ratio.
本研究的目的是检验急性离心运动对腿部屈肌和伸肌最大等速向心峰力矩（PT）以及腘绳肌/四头肌（H:Q）强度比的影响。16 名男性（平均±标准差：年龄=20.9±2 岁；身高=177.0±4.4cm；体重=76.8±10.0kg）志愿者在进行离心运动前（24-72 小时）和后（24-72 小时）分别进行了最大、向心等速腿部伸展和弯曲肌肉动作，角速度为 60°·sec-1。离心运动方案包括 4 组 10 次重复的腿推、腿伸和腿弯练习，使用的是 1-RM 的 120%。结果表明，急性离心运动方案导致 24-72 小时后等速腿部弯曲（13-19%）和腿部伸展（11-16%）PT 显著降低（P<0.05）。然而，H:Q 比值不受离心运动方案的影响。这些发现表明，利用多关节和单关节动态恒外力（DCER）练习的急性离心运动导致腿部屈肌和伸肌最大等速力量相似的下降，但不会改变 H:Q 比值。
