频闪仪
Plyometrics公司
统计显著性
跳跃
心理学
跳跃的
康复
物理医学与康复
数学
物理疗法
统计
医学
工程类
物理
生理学
量子力学
电气工程
作者
Talin Louder,Melissa Kroll,Jordan Preuss,Jake Rosburg,L.H. Boman
出处
期刊:Medicine and Science in Sports and Exercise
[Ovid Technologies (Wolters Kluwer)]
日期:2019-06-01
卷期号:51 (6S): 62-62
标识
DOI:10.1249/01.mss.0000560679.45646.fe
摘要
It is believed that ACL injury risk is multifaceted and includes structural, biomechanical, and cognitive factors. Recently, it is observed that overreliance on exteroception (visual stimuli) following ACL rehabilitation may increase the risk of re-rupture. There may be utility in using stroboscopic vision as an enhancement to plyometric movements and neuromuscular ACL-prevention programs. PURPOSE: To evaluate the effects of stroboscopic vision on Reactive Strength Index (RSI) scores in female NCAA Division I volleyball players. METHODS: Thirteen female NCAA Division I volleyball players performed three trials of depth jumping across five conditions: (1) 0.38 m - no visual restriction, (2) 0.53 m - no visual restriction, (3) 0.69 m - no visual restriction, (4) 0.38 m - high-frequency stroboscopic vision (H-f), and (5) 0.38 m - low-frequency stroboscopic vision (L-f). For all trials, the RSI, rebound jump height (RJH; m), and ground contact time (GCT; s) were computed from vertical ground reaction force data acquired via a tri-axial force platform. To evaluate the statistical significance of results, a Multivariate General Linear Model Analysis of Variance (GLM ANOVA) was performed using RSI, RJH (m), and GCT (s) as dependent measures. The five depth jump conditions were included as levels within a single condition factor. Statistical significance was set at an alpha level of 0.05. RESULTS: Main effects of depth jump condition were observed for RSI and GCT (s) (p = 0.001), but not for RJH (m) (p = 0.101). Post-hoc comparisons revealed that RSI scores were lower for stroboscopic conditions (H-f: 0.75 ± 0.16; L-f: 0.72 ± 0.16) versus no visual restriction (0.38 m: 0.80 ± 0.17; 0.53 m: 0.79 ± 0.17; 0.69 m: 0.79 ± 0.16). Post-hoc comparisons revealed that GCT (s) was greater for stroboscopic conditions (H-f: 0.47 ± 0.07 s; L-f: 0.49 ± 0.07 s) versus no visual restriction (0.38 m: 0.46 ± 0.07 s; 0.53 m: 0.45 ± 0.07 s; 0.69 m: 0.45 ± 0.07 s). CONCLUSION: Integrating stroboscopic vision into the depth jump movement reduced RSI scores in a sample of female NCAA Division I volleyball players, which was attributable to longer GCTs (s). The results suggest that adding stroboscopic vision to plyometric movements may increase the difficulty of the task from either a cognitive or biophysical perspective.
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