Washif Jad Adrian, Kok Lian-Yee
High-Performance Branch, National Sports Institute of Malaysia, Bukit Jalil, Malaysia.
Department of Sports Studies, Universiti Putra Malaysia, Serdang, Malaysia.
J Hum Kinet. 2020 Jul 21;73:45-55. doi: 10.2478/hukin-2020-0003. eCollection 2020 Jul.
Plyometric exercises such as drop jumping and bounding offer athletes a substantiated means of enhancing athletic performance. Between the two exercises, reactive measurement using bounding (reactive bounding coefficient [RBC]) has received scant attention within the domain of training and conditioning. Therefore, this study aimed to identify the viability of utilising a speed-bounding exercise to assess horizontal reactive strength. Eleven young, male elite sprinters (age: 17.8 ± 1.3 yr; body height: 1.72 ± 0.06 m; body mass: 66.05 ± 6.10 kg; best 100 m sprint time: 10.77 ± 0.32 s) were tested for static jumps (SJ), drop jumps (DJ), 10 speed-bounding (RBC10), and 50 m sprint performance. Between-group comparisons based on sprint ability (fast [FSG] vs. slow [SSG] sprint-group) and correlation coefficients were computed subsequently. The FSG (n = 5; 50 m time: 5.82 ± 0.11 s; RBC10: 7.46 ± 0.27) performed significantly better in the RBC10 (p = 0.036) than the SSG (n = 5; 50 m time: 6.09 ± 0.13 s; RBC10: 7.09 ± 0.25). A very high correlation was attained between the RBC10 and the criterion measure, the SJ (r = 0.83). Additionally, RBC10 appeared to be correlated with 30, 50, 10-30 and 30-50 m sprint times (r = -0.52 to -0.60). This positive trend, however, was not observed for the DJ reactive strength index (trivial to moderate correlations). Good reliability was shown for the RBC10 and all sprint distances ("1.5% coefficient variation). Furthermore, all sprinters attained ground contact times of 0.12-0.18 s during the RBC10 which was indicative of fast stretch-shortening cycles during movement, suggesting that the RBC10 could be utilised to assess plyometric ability and enhance sprint performance. Overall, the RBC10 seems able to discriminate between the FSG and the SSG, indicating it has acceptable levels of validity and reliability.
诸如跳深和单脚跳之类的增强式训练为运动员提供了一种经过证实的提高运动成绩的方法。在这两种训练之间，使用单脚跳进行的反应性测量（反应性单脚跳系数[RBC]）在训练和体能调节领域受到的关注很少。因此，本研究旨在确定利用快速单脚跳训练来评估水平反应力量的可行性。对11名年轻男性精英短跑运动员（年龄：17.8±1.3岁；身高：1.72±0.06米；体重：66.05±6.10千克；100米短跑最佳成绩：10.77±0.32秒）进行了立定跳远（SJ）、跳深（DJ）、10次快速单脚跳（RBC10）和50米短跑成绩测试。随后计算了基于短跑能力的组间比较（快速短跑组[FSG]与慢速短跑组[SSG]）以及相关系数。FSG组（n = 5；50米时间：5.82±0.11秒；RBC10：7.46±0.27）在RBC10测试中的表现显著优于SSG组（n = 5；50米时间：6.09±0.13秒；RBC10：7.09±0.25）（p = 0.036）。RBC10与标准测量指标立定跳远（SJ）之间具有非常高的相关性（r = 0.83）。此外，RBC10似乎与30米、50米、10 - 30米和30 - 50米的短跑时间相关（r = -0.52至-0.60）。然而，跳深反应力量指数未观察到这种正相关趋势（相关性微弱至中等）。RBC10以及所有短跑距离均显示出良好的可靠性（变异系数为1.5%）。此外，所有短跑运动员在RBC10测试中的触地时间为0.12 - 0.18秒，这表明运动过程中具有快速的拉长 - 缩短周期，这表明RBC10可用于评估增强式训练能力并提高短跑成绩。总体而言，RBC10似乎能够区分FSG组和SSG组，表明其具有可接受的效度和信度水平。
