Division of Sport and Recreation, Institute of Sport and Recreation Research New Zealand, AUT University, Auckland, New Zealand.
J Strength Cond Res. 2011 Jun;25(6):1616-21. doi: 10.1519/JSC.0b013e3181ddfabc.
Resistance training at the load that maximizes peak power (Pmax) may produce greater increases in peak power than other loads. Pmax for lower-body lifts can occur with no loading but whether Pmax can be increased further with negative loading is unclear. The purpose of this investigation was therefore to determine lower-body Pmax (jump squat) using a spectrum of loads. Box squat 1 repetition maximum (1RM) was measured in 18 elite rugby-union players. Pmax was then determined using loads of -28 to 60%1RM. Elastic bands were used to unload body weight for negative loads. Jump squat Pmax occurred with no loading (body weight: 8,880 ± 2,186 W) in all but 2 subjects. There was a discontinuity in the power-load relationship for the jump squat, possibly because of the increased countermovement in the body weight jump. The self-selected depth (dip) before the propulsive phase of the jump was greater by 24 ± 11 to 40 ± 16% (moderate to large effect size) than all positive loads. These findings highlight methodological issues that need to be taken into consideration when comparing power outputs of loaded and unloaded jumps.
抗阻训练在达到最大功率峰值（Pmax）的负荷下进行，可能比其他负荷产生更大的最大功率峰值增加。下半身举重的 Pmax 可以在没有负荷的情况下发生，但是否可以通过负向负荷进一步增加 Pmax 尚不清楚。因此，本研究的目的是确定使用一系列负荷的下半身 Pmax（深蹲跳）。18 名精英橄榄球联盟运动员测量了箱式深蹲 1 次最大重复次数（1RM）。然后使用-28%至 60%1RM 的负荷来确定 Pmax。弹性带用于为负向负荷卸除体重。除了 2 名受试者外，所有受试者在下蹲跳中均在无负荷（体重：8880±2186W）的情况下达到 Pmax。深蹲跳的功率-负荷关系存在不连续性，这可能是由于体重跳跃中的反向运动增加所致。在跳跃的推进阶段之前，自行选择的深度（下蹲）比所有正向负荷大 24±11%至 40±16%（中等至较大的效应量）。这些发现强调了在比较加载和未加载跳跃的功率输出时需要考虑的方法学问题。
