Center of Excellence for Sport Science and Coach Education, Department of Kinesiology, Leisure, and Sports Science, East Tennessee State University, Johnson City, TN, USA.
Int J Sports Physiol Perform. 2009 Dec;4(4):461-73. doi: 10.1123/ijspp.4.4.461.
To investigate the relationship between maximum strength and differences in jump height during weighted and unweighted (body weight) static (SJ) and countermovement jumps (CMJ).
Sixty-three collegiate athletes (mean +/- SD; age= 19.9 +/- 1.3 y; body mass = 72.9 +/- 19.6 kg; height = 172.8 +/- 7.7 cm) performed two trials of the SJ and CMJ with 0 kg and 20 kg on a force plate; and two trials of mid-thigh isometric clean pulls in a custom rack over a force plate (1000-Hz sampling). Jump height (JH) was calculated from flight time. Force-time curve analyses determined the following: isometric peak force (IPF), isometric force (IF) at 50, 90, and 250 ms, and isometric rates of force development (IRFD). Absolute and allometric scaled forces, [absolute force/(body mass(0.67))], were used in correlations.
IPF, IRFD, F50(a), F50, F90, and F250 showed moderate/strong correlations with SJ and CMJ height percent decrease from 0 to 20 kg. IPF(a) and F250(a) showed weak/moderate correlations with percent height decrease. Comparing strongest (n = 6) to weakest (n = 6): t tests revealed that stronger athletes (IPF(a)) performed superior to weaker athletes.
Data indicate the ability to produce higher peak and instantaneous forces and IRFD is related to JH and to smaller differences between weighted and unweighted jump heights. Stronger athletes jump higher and show smaller decrements in JH with load. A weighted jump may be a practical method of assessing relative strength levels.
研究在有负重和无负重（体重）的静态（SJ）和反向跳跃（CMJ）中，最大力量与跳跃高度差异之间的关系。
63 名大学生运动员（平均值±标准差；年龄=19.9±1.3 岁；体重=72.9±19.6kg；身高=172.8±7.7cm）在力板上进行了两次 0kg 和 20kg 的 SJ 和 CMJ 测试；在力板上方的定制支架中进行了两次大腿中部等长清洁拉测试（1000Hz 采样）。从飞行时间计算跳跃高度（JH）。力-时间曲线分析确定了以下参数：等长峰值力（IPF）、50、90 和 250ms 的等长力（IF），以及等长力发展速率（IRFD）。绝对和同比例缩放力，[绝对力/（体重（0.67））]，用于相关分析。
IPF、IRFD、F50(a)、F50、F90 和 F250 与 SJ 和 CMJ 高度从 0 到 20kg 的百分比下降呈中度/强相关性。IPF(a)和 F250(a)与百分比高度下降呈弱/中度相关性。最强（n=6）和最弱（n=6）的比较：t 检验显示，更强壮的运动员（IPF(a)）表现优于较弱的运动员。
数据表明，产生更高峰值和瞬时力的能力以及 IRFD 与 JH 以及负重和无负重跳跃高度之间的差异有关。更强壮的运动员跳跃更高，负荷时 JH 下降幅度更小。加权跳跃可能是评估相对力量水平的一种实用方法。
