Stephens Thomas M, Lawson Brooke R, DeVoe Dale E, Reiser Raoul F
Health and Exercise Science, Colorado State University, Fort Collin, CO, USA.
J Appl Biomech. 2007 Aug;23(3):190-202. doi: 10.1123/jab.23.3.190.
Expectations may be for both legs to function identically during single- and double-leg vertical jumps. However, several reasons might prevent this from occurring. The goals of this investigation were twofold: assess the presence of side-to-side jump height differences during single-leg jumps in a homogenous group of healthy subjects and determine if those with a jump height asymmetry possessed consistent biomechanical differences during single-and double-leg jumps. Thirteen men and 12 women with competitive volleyball experience volunteered for the study. Significance was assessed at p < 0.05. The men jumped significantly higher than the women in all conditions and possessed differences in several anthropometric, kinematic, and kinetic parameters. Based on a three-jump average, all subjects had one leg that they could jump higher with (the dominant leg, DL). The men generated significantly greater maximum ground reaction forces and ankle joint powers on their DL whereas the women had no differences during the single-leg jumps. The only side-to-side differences that existed during the double-leg jumps were in the average ground reaction forces during propulsion. These findings suggest that equality of single-leg jump performance is the exception rather than the norm, with identification of consistent biomechanical attributes difficult within a group.
人们可能期望在单腿和双腿垂直跳跃过程中双腿的功能完全相同。然而，有几个原因可能会阻止这种情况的发生。本研究的目的有两个：评估一组健康受试者在单腿跳跃过程中左右腿跳跃高度差异的存在情况，并确定那些跳跃高度不对称的人在单腿和双腿跳跃过程中是否存在一致的生物力学差异。13名有竞技排球经验的男性和12名有竞技排球经验的女性自愿参与了这项研究。显著性水平设定为p < 0.05。在所有条件下，男性的跳跃高度均显著高于女性，并且在一些人体测量学、运动学和动力学参数上存在差异。基于三次跳跃的平均值，所有受试者都有一条腿能够跳得更高（优势腿，DL）。男性在其优势腿上产生的最大地面反作用力和踝关节功率显著更大，而女性在单腿跳跃过程中没有差异。双腿跳跃过程中唯一存在的左右差异在于推进过程中的平均地面反作用力。这些发现表明，单腿跳跃表现的平等是例外而非常态，在一个群体中很难识别出一致的生物力学特征。
