Asymmetry During Landing Impacts Following Jumps With Aerial Rotation in Collegiate Men's Basketball Players.

IF 2.5 2区 医学 Q2 SPORT SCIENCES
John R Harry, Sunny Park, Michael Stewart, Mia Hite, Anton Simms, Margaret Larsen, Chris Bishop
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Abstract

Abstract: Harry, JR, Park, S, Stewart, M, Hite, M, Simms, A, Larsen, M, and Bishop, C. Asymmetry during landing impacts following jumps with aerial rotation in collegiate men's basketball players. J Strength Cond Res 39(3): 352-359, 2025-This project explored whether (a) landing performances and (b) impact force asymmetries were different during countermovement jump (CMJ) landings with leftward versus rightward aerial rotation in 19 collegiate men's basketball players. Replicated single-subject analyses were performed to identify differences that were both statistically significant and important for each individual. Countermovement jump landing performance and loading, attenuation, and control phase durations were compared, while interlimb vertical ground reaction forces (GRF) were compared during each phase of CMJ landings with leftward and rightward rotations, respectively, using the model statistic and coefficient of variation techniques. The model statistic provided random chance probability ( α = 0.05). The coefficient of variation provided whether differences exceeded the largest amount of variation from each limb or rotation direction. The bilateral asymmetry index (BAI; difference between dominant and nondominant limbs divided by the sum of the 2 limbs) was also calculated. Statistically significant (model statistic results) and important (coefficient of variation results) differences in landing performance were detected between rotation conditions in 4 subjects. Most subjects did not display significant and important asymmetries for the changes of vertical GRF during any phase of CMJ landings with leftward or rightward rotations. Large amounts of intra-individual variation seem to be an influential factor for these results, as basketball players seem to have unrefined landing strategies that could require targeted training. Because the BAI values reached as high as ± 531% without coinciding with significant and important asymmetry, researchers and practitioners may need to reevaluate the way in which asymmetry indices are interpreted.

大学男子篮球运动员空中旋转跳跃后落地冲击的不对称性。
摘要:Harry, JR, Park, S, Stewart, M, Hite, M, Simms, A, Larsen, M, and Bishop, C.大学生男子篮球运动员空中旋转跳跃后落地撞击的不对称性。[J] .力量与运动,XX(X): 000-000, 2024-本研究探讨了19名大学生男子篮球运动员在空中旋转向左与向右时的反身起跳(CMJ)起落时的(a)起落表现和(b)冲击力不对称性是否存在差异。进行重复的单受试者分析,以确定对每个个体都具有统计意义和重要的差异。利用模型统计量和变异系数技术,比较了CMJ的反动作跳跃着陆性能、载荷、衰减和控制阶段持续时间,并比较了CMJ在左旋和右旋着陆各阶段的肢间垂直地面反力(GRF)。模型统计量提供随机机会概率(α = 0.05)。变异系数提供了差异是否超过每个肢体或旋转方向的最大变异量。双侧不对称指数(BAI;还计算了主肢与非主肢之差除以两肢之和。4名受试者在旋转条件下的着陆性能差异有统计学意义(模型统计结果)和重要差异(变异系数结果)。大多数受试者在CMJ向左或向右旋转着陆的任何阶段,垂直GRF的变化都没有表现出显著和重要的不对称性。大量的个体内部差异似乎是这些结果的一个影响因素,因为篮球运动员似乎没有完善的着陆策略,可能需要有针对性的训练。由于BAI值高达±531%,而不符合显著和重要的不对称性,研究人员和从业人员可能需要重新评估解释不对称性指数的方式。
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来源期刊
CiteScore
6.70
自引率
9.40%
发文量
384
审稿时长
3 months
期刊介绍: The editorial mission of The Journal of Strength and Conditioning Research (JSCR) is to advance the knowledge about strength and conditioning through research. A unique aspect of this journal is that it includes recommendations for the practical use of research findings. While the journal name identifies strength and conditioning as separate entities, strength is considered a part of conditioning. This journal wishes to promote the publication of peer-reviewed manuscripts which add to our understanding of conditioning and sport through applied exercise science.
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