Bailey Christopher A, Sato Kimitake, Burnett Angus, Stone Michael H
1Department of Exercise Science, LaGrange College, LaGrange, Georgia; 2Department of Exercise and Sport Sciences, Center of Excellence for Sport Science and Coach Education, East Tennessee State University, Johnson City, Tennessee; and 3Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar.
J Strength Cond Res. 2015 Nov;29(11):3188-96. doi: 10.1519/JSC.0000000000000983.
This study sought to determine the level of association between bilateral force production symmetry assessment methods (standing weight distribution [WtD], unloaded and lightly loaded jumps, and isometric strength) and to determine whether the amount of symmetry carry-over between these tasks differs for strong and weak athletes. Subjects for this study included male (n = 31) and female (n = 32) athletes from National Collegiate Athletic Association Division I sports. Athletes performed WtD, unloaded and lightly loaded (20 kg) static and countermovement jumps, and isometric midthigh pull (IMTP) assessments on 2 adjacent force plates. Ground reaction force data were used to calculate symmetry variables and performance-related variables. Using Pearson zero order correlations, evaluations of the amount of symmetry carry-over were made. Weight distribution correlated strongly with jump peak force (PF) (r = 0.628-0.664). Strong relationships were also observed between loading conditions for jump variables (r = 0.568-0.957) as were the relationships between jump types for PF, peak power, and net impulse (r = 0.506-0.834). Based on the pooled sample, there was a lack of association between IMTP and WtD for jump symmetry variables. However, when examining strong and weak groups, rate of force development showed moderate to strong symmetry carry-over in the strongest athletes (r = 0.416-0.589). Stronger athletes appear to display similar explosive strength symmetry characteristics in dynamic and isometric assessments, unlike weaker athletes. Strength seems to influence the amount of force production symmetry carry-over between bilateral assessments. There may be optimal loads and variables for symmetry assessment, but these may differ based on population characteristics.
本研究旨在确定双侧力量产生对称性评估方法(站立体重分布[WtD]、无负荷和轻负荷跳跃以及等长力量)之间的关联程度,并确定这些任务之间的对称性延续量在强壮和较弱运动员之间是否存在差异。本研究的受试者包括来自美国国家大学体育协会第一分区运动项目的男性(n = 31)和女性(n = 32)运动员。运动员在相邻的两个测力板上进行WtD、无负荷和轻负荷(20千克)的静态和反向运动跳跃以及等长大腿中部拉力(IMTP)评估。地面反作用力数据用于计算对称性变量和与表现相关的变量。使用皮尔逊零阶相关性对对称性延续量进行评估。体重分布与跳跃峰值力(PF)密切相关(r = 0.628 - 0.664)。跳跃变量的负荷条件之间也观察到强相关性(r = 0.568 - 0.957),PF、峰值功率和净冲量的跳跃类型之间的关系也是如此(r = 0.506 - 0.834)。基于合并样本,对于跳跃对称性变量,IMTP和WtD之间缺乏关联。然而,在检查强壮组和较弱组时,最强壮的运动员中力量发展速率显示出中等至强的对称性延续(r = 0.416 - 0.589)。与较弱的运动员不同,较强壮的运动员在动态和等长评估中似乎表现出相似的爆发力对称性特征。力量似乎会影响双侧评估之间力量产生对称性延续的量。可能存在用于对称性评估的最佳负荷和变量,但这些可能因人群特征而异。