Cronin J B, McNair P J, Marshall R N
Sport Performance Centre, School of Physiotherapy, Auckland University of Technology, New Zealand.
Med Sci Sports Exerc. 2000 Oct;32(10):1763-9. doi: 10.1097/00005768-200010000-00016.
The influence of maximal strength, as measured by the maximal load lifted for one repetition (1RM), on power production in the initial 200 ms of the concentric phase for both rebound and nonrebound movements was investigated. We also investigated the effect of external load upon this relationship.
Twenty-seven male subjects (21.9 +/- 3.1 yr, 89.0 +/- 12.5 kg) were separated by previously determined bench press IRM into high (100.88 +/- 7.24 kg) and low (72 +/- 6.61 kg) RM groups. Concentric only bench presses and rebound bench presses were compared between and within groups to note the effect of RM across external loads of 40%, 60%, and 80% 1RM, on instantaneous, mean, and peak power output.
The results of this study clearly indicated the enhancement of concentric motion by prior eccentric muscle action (336-1332% enhancement in the first 20 ms). Possessing a high RM augmented power production in the initial 200 ms of stretch-shorten cycle activity, across all the external resistances tested (P < 0.05). The temporal characteristics of this enhancement, however, differed across loads. That is, 80% IRM loading showed a later time to peak enhancement (80 ms vs 20 ms). Interestingly, the influence of RM on concentric only motion in the initial 200 ms across the external resistances tested was found to be nonsignificant.
The results suggest that the role of maximal strength during initial power production between concentric and stretch-shorten cycle activity differs, which has important implications for the training of athletes.
研究通过一次重复最大负荷（1RM）测量的最大力量对向心阶段初始200毫秒内反弹和非反弹运动中功率产生的影响。我们还研究了外部负荷对这种关系的影响。
27名男性受试者（21.9±3.1岁，89.0±12.5千克）根据先前确定的卧推1RM分为高（100.88±7.24千克）和低（72±6.61千克）RM组。在组间和组内比较仅向心卧推和反弹卧推，以观察RM对40%、60%和80% 1RM外部负荷下瞬时、平均和峰值功率输出的影响。
本研究结果清楚地表明先前的离心肌肉动作增强了向心运动（在最初20毫秒内增强336%-1332%）。在所有测试的外部阻力下，拥有高RM在拉长-缩短周期活动的初始200毫秒内增强了功率产生（P<0.05）。然而，这种增强的时间特征因负荷而异。也就是说，80% 1RM负荷显示达到峰值增强的时间较晚（80毫秒对20毫秒）。有趣的是，发现在测试的外部阻力下，RM对初始200毫秒内仅向心运动的影响不显著。
结果表明，最大力量在向心和拉长-缩短周期活动初始功率产生过程中的作用不同，这对运动员的训练具有重要意义。
