Background: Bilateral leg power is being increasingly investigated as a proxy for the recovery of muscle performance after injury. Functional tests like the single leg hop for distance (SLHD) and single leg vertical jump (SLVJ) are often used to determine symmetry and return to play (RTP) readiness. As an injury predictor, leg power is accurately measured with the Keiser Air420 seated leg press.
Purpose: To measure and analyze lower leg asymmetry in healthy collegiate athletes across each test battery.
Methods: Eighty-eight healthy student-athletes (44 males, 44 females) across 14 varsity teams at Wake Forest University performed the SLHD, SLVJ, and the Keiser. Horizontal and vertical displacement were measured via the SLHD and SLVJ, respectively. Peak power was recorded via the Keiser Air420 leg press. Pearson correlations and repeated measures ANOVA were used to calculate associations and compare bilateral asymmetry indices (BAI) and raw scores.
Results: There was a significant effect on each test’s raw BAI (P < 0.01). The mean absolute BAI were 5.42 ± 4.9%, 6.64 ± 4.9% and 5.36 ± 4.7% for the SLHD, SLVJ and Keiser, respectively. The SLVJ and Keiser (dominant leg r = 0.832, nondominant leg r = 0.826) were more highly correlated than the SLHD and Keiser (dominant leg r = 0.645, nondominant leg r = 0.687), all of which were statistically significant (P < 0.01).
Conclusion: At the 90th percentile, healthy collegiate athletes attained < 15% BAI. We recommend the implementation of a battery of tests to determine normative lower limb asymmetry. A battery of functional tests may present different asymmetry indices as opposed the 10% reference asymmetry.



中文翻译：

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健康大学生运动员腿部力量不同功能测试与规范双侧不对称指数的比较

背景：越来越多地研究双侧腿部力量作为损伤后肌肉性能恢复的代表。单腿跳远距离 (SLHD) 和单腿垂直跳跃 (SLVJ) 等功能测试通常用于确定对称性和回归比赛 (RTP) 准备情况。作为伤害预测指标，使用 Keizer Air420 坐式压腿机可准确测量腿部力量。
目的：测量和分析每个测试组中健康大学生运动员的小腿不对称性。
方法：维克森林大学 14 个校队的 88 名健康学生运动员（44 名男性，44 名女性）进行了 SLHD、SLVJ 和 Keiser。水平和垂直位移分别通过 SLHD 和 SLVJ 测量。通过 Keizer Air420 腿部推举记录了峰值功率。Pearson 相关性和重复测量方差分析用于计算关联并比较双边不对称指数 (BAI) 和原始分数。
结果：对每个测试的原始 BAI 有显着影响（P< 0.01)。SLHD、SLVJ 和 Keiser 的平均绝对 BAI 分别为 5.42 ± 4.9%、6.64 ± 4.9% 和 5.36 ± 4.7%。SLVJ 和 Keizer（优势腿 r = 0.832，非优势腿 r = 0.826）的相关性高于 SLHD 和 Keizer（优势腿 r = 0.645，非优势腿 r = 0.687），均具有统计学意义（P < 0.01 ）。
结论：在第 90 个百分位，健康的大学运动员的 BAI 低于 15%。我们建议实施一系列测试以确定规范的下肢不对称。一组功能测试可能会呈现不同的不对称指数，而不是 10% 的参考不对称。