Department of Exercise and Sport Science, The University of Utah, 250 S. 1850 E. Room 241, Salt Lake City, UT 84112-0920, USA.
Eur J Appl Physiol. 2010 Dec;110(6):1225-33. doi: 10.1007/s00421-010-1619-z. Epub 2010 Aug 25.
Previous investigators have reported velocity-dependent strength loss for single-joint actions following acute eccentric exercise. The extent to which velocity influences recovery of multi-joint function is not well documented. Our main purpose was to compare alterations in maximal cycling power produced across a range of pedaling rates following eccentric exercise. An additional purpose was to determine the extent to which changes in rating of perceived exertion (RPE) associated with submaximal cycling reflect changes in maximal cycling power. Eighteen cyclists performed baseline trials of maximal and submaximal single-leg concentric cycling immediately before and 24 and 48 h after acute submaximal single-leg eccentric (151 ± 32 W, 487 ± 107 s) and concentric (148 ± 21 W, 488 ± 79 s) cycling trials. Maximum cycling power (apex of power-pedaling rate relationship; P (max)) was assessed using inertial-load cycling, and powers produced at 65, 110 and 155 rpm were also analyzed. Compared to baseline, P (max) was reduced (11-13%) at 24-48 h in the eccentric leg (P < 0.001). Power produced at 65, 110 and 155 rpm was reduced by similar relative magnitudes (11-15%) at 24-48 h in the eccentric leg. RPE increased (15-18%) at 24-48 h in the eccentric leg (P < 0.001). Magnitudes of relative changes in RPE did not differ from those for P (max). There were no alterations in the concentric leg. Our results indicated a global, rather than velocity-specific, reduction in neuromuscular function. Such a global reduction does not support the notion of fiber-type specific damage from eccentric exercise. The similar relative changes in RPE and P (max) suggest that increased exertion may reflect the need to recruit additional motor units to produce the same submaximal power.
先前的研究人员已经报告了在急性离心运动后进行单关节动作时，速度依赖性力量损失的情况。但是，速度对多关节功能恢复的影响程度尚未得到很好的记录。我们的主要目的是比较在离心运动后，在一系列踏频下产生的最大骑行功率的变化。另一个目的是确定与亚最大骑行相关的感知用力评级（RPE）变化与最大骑行功率变化的程度。18 名自行车手在急性单腿离心（151±32 W，487±107 s）和单腿向心（148±21 W，488±79 s）运动前后的基线试验中，分别进行了最大和亚最大单腿向心骑行的试验。使用惯性负荷骑行评估最大骑行功率（功率-踏频关系的峰值；P（max）），并分析在 65、110 和 155 rpm 时产生的功率。与基线相比，离心腿在 24-48 小时时 P（max）降低了 11-13%（P<0.001）。在 24-48 小时时，离心腿在 65、110 和 155 rpm 时产生的功率降低了相似的相对幅度（11-15%）。在离心腿中，RPE 在 24-48 小时时增加了 15-18%（P<0.001）。离心腿中 RPE 和 P（max）的相对变化幅度没有差异。在向心腿中没有变化。我们的结果表明，神经肌肉功能的降低是全身性的，而不是速度特异性的。这种全身性的降低并不支持离心运动导致纤维类型特异性损伤的观点。RPE 和 P（max）的相对变化相似，这表明增加的用力可能反映了需要招募更多的运动单位来产生相同的亚最大功率。
