Muscle tenderness and peak torque changes after downhill running following a prior bout of isokinetic eccentric exercise
Muscle tenderness and peak torque changes after downhill running following a prior bout of isokinetic eccentric exercise
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DOI：
10.1080/02640419608727714
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发表时间：
1996-08-01
影响因子：
3.4
通讯作者：
Baltzopoulos, V
中科院分区：
文献类型：
--
作者：
Eston, RG;Finney, S;Baltzopoulos, V
不习惯的运动（通常是偏心性质的）通常会导致延迟性肌肉酸痛（DOMS）。先前的研究已经发现，先前的离心活动产生了减少DOMS和形态变化的训练效果。本研究的目的是研究最大等速离心运动对下坡跑后DOMS，力量损失和血浆肌酸激酶（CK）变化的影响。10例男性受试者的平均值（+/- S.D.）年龄为22.5 ± 2.8岁，体重为62.67 ± 0.05 kg，身高为176 ± 3 cm，被分配到治疗组或对照组。治疗组在0.52 rad s（-1）的优势腿上进行100次膝伸肌最大离心激活。两周后，在电动跑步机上进行下坡跑。这包括以-10%梯度和对应于80%预测最大心率的速度进行5次8分钟的发作。未经训练的组如上所述进行下坡跑，但没有之前的等速训练。分别于实验前、实验后即刻、实验后2、4和7天记录伸膝肌在0.52和2.83 rad s（-1）时的张力、血浆CK活性、向心和离心等速扭矩。等速训练使治疗组在两种速度下的CK和压痛增加（P < 0.01），向心和离心扭矩减少（P < 0.05）。下坡跑后，在对照组中，在两种等速下，在偏心和同心模式下观察到峰值扭矩降低（P < 0.01）。对于治疗组，峰值扭矩的降低仅发生在更快的偏心速度下。除了更快的离心速度外，在所有运动后的等速力量测试中，对照组的峰值扭矩的减少量更大。训练组膝关节压痛明显少于对照组（P < 0.01）。峰值扭矩也恢复到下坡前的值较早的训练组。下坡跑后两组血浆CK活性均升高，但训练组明显低于对照组（P < 0.01）。结果表明，事先进行一轮等速离心训练可以减少肌肉损伤，减少力量损失量，并减少下坡跑后的DOMS感觉。
Unaccustomed exercise (usually of an eccentric nature) is often followed by delayed onset muscle soreness (DOMS). Previous studies have found that prior eccentric activity produces a training effect which reduces DOMS and morphological changes. The aim of this study was to examine the effects of a prior bout of maximal isokinetic eccentric exercise on DOMS, strength loss and plasma creatine kinase (CK) changes following a downhill run. Ten male subjects with a mean (+/- S.D.) age of 22.5 +/- 2.8 years, body mass of 62.67 +/- 0.05 kg and height of 176 +/- 3 cm were allocated to either a treatment group or a control group. The treatment group performed 100 maximal eccentric activations of the knee extensors in the dominant leg at 0.52 rad s(-1). Two weeks later, the downhill run was performed on a motor-driven treadmill. This consisted of five bouts of 8 min at a gradient of -10% at a speed corresponding to 80% of the predicted maximal heart rate. The untrained group performed the downhill run as above but without the prior isokinetic session. Tenderness measurements, plasma CK activity and concentric and eccentric isokinetic peak torque measurements of the knee extensors at 0.52 and 2.83 rad s(-1) were recorded prior to, immediately following and 2, 4 anti 7 days after each protocol. The isokinetic protocol caused an increase (P < 0.01) in CK and tenderness and a decrease (P < 0.05) in concentric and eccentric torque at both speeds in the treatment group. Following the downhill run, a reduction in peak torque (P < 0.01) was observed in the eccentric and concentric modes at both isokinetic speeds in the control group. For the treatment group, the decrease in peak torque occurred only at the faster eccentric speed. With the exception of the faster eccentric speed, the decrement in peak torque war; greater in the control group in all post-exercise isokinetic strength tests. There was less tenderness (P < 0.01) in the trained knee extensor muscle group. Peak torque also returned to pre-downhill values earlier for the trained group. Although plasma CK activity increased in both groups after downhill running, it was much lower (P < 0.01) in the trained group. The results suggest that a prior bout of isokinetic eccentric training reduces muscle damage, reduces the amount of strength loss and decreases the sensation of DOMS after downhill running.