Comparing Differences and Relationships Between Traditional and Resisted Sprints in Elite Youth Rugby Backs and Forwards.

IF 3.5 2区 医学 Q1 PHYSIOLOGY
Santiago Zabaloy, Tomás T Freitas, Luciano Tomaghelli, Juan Aparicio, Franco Vega, Joaquín Medrano, Eduardo Tondelli, Lucas A Pereira, Irineu Loturco
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Abstract

Purpose: We tested the differences in maximum strength and various parameters of sprint performance between youth backs and forwards. Additionally, we examined the associations among various strength-sprint measures, as well as between unresisted and heavy resisted sprints.

Methods: Thirty-two youth rugby players were assessed at the beginning of the season with the following tests: unresisted and resisted (50% body mass) 30-m sprints and 1-repetition maximum (1RM) in the squat exercise. Body mass, sprint velocity, and 1RM values were compared between backs and forwards using an independent t test. Pearson product-moment correlation was used to assess the relationships between absolute and relative 1RM values (rel1RM) and unresisted and resisted sprints.

Results: Youth backs outperform forwards in terms of maximum velocity and under resisted sprinting conditions. Furthermore, backs exhibit higher levels of rel1RM compared with forwards. Our findings indicate significant correlations between resisted and unresisted sprinting for several sprint qualities when considering all players together. When participants were divided into different groups, stronger correlations between resisted and unresisted sprints were found among slower/heavier players (forwards). Notably, for faster players (backs), there was no significant correlation between heavy resisted sprints and maximum velocity (r = .25; P = .4). Last, despite their lower rel1RM values compared with backs, for forwards the rel1RM is closely associated with unresisted and resisted sprints.

Conclusion: Unlike youth forwards, for youth backs, the ability to sprint faster with heavy sled loads is not associated with the maximum velocity achieved in linear sprints, and higher values of rel1RM do not necessarily lead to improved sprint performance.

青年精英橄榄球后卫和前锋传统冲刺与抵抗冲刺的差异和关系比较。
目的:测试青年后卫和前锋在最大力量和冲刺性能各参数上的差异。此外,我们检查了各种力量冲刺措施之间的联系,以及无阻力和重阻力冲刺之间的联系。方法:在赛季开始时对32名青少年橄榄球运动员进行以下测试:无阻力和阻力(50%体重)30米短跑和1次最大重复(1RM)深蹲练习。身体质量、冲刺速度和1RM值采用独立t检验比较。使用Pearson积差相关来评估绝对和相对1RM值(rel1RM)与未抵抗和抵抗冲刺之间的关系。结果:青年后卫在最大速度和抵抗冲刺条件下优于前锋。此外,后腰比前锋表现出更高的rel1RM水平。我们的研究结果表明,当将所有玩家放在一起考虑时,抵抗性冲刺和非抵抗性冲刺之间存在显著的相关性。当参与者被分成不同的小组时,在速度较慢/较重的球员(前锋)中发现了阻力冲刺和非阻力冲刺之间更强的相关性。值得注意的是,对于速度更快的球员(后卫)来说,重阻力冲刺和最大速度之间没有显著的相关性(r = 0.25;P = .4)。最后,尽管它们的rel1RM值比后场低,但对于前场来说,rel1RM与无阻力冲刺和有阻力冲刺密切相关。结论:与青年前锋不同的是,对于青年后卫来说,负重冲刺更快的能力与直线冲刺中达到的最大速度无关,更高的rel1RM值并不一定会导致冲刺成绩的提高。
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来源期刊
CiteScore
5.80
自引率
12.10%
发文量
199
审稿时长
6-12 weeks
期刊介绍: The International Journal of Sports Physiology and Performance (IJSPP) focuses on sport physiology and performance and is dedicated to advancing the knowledge of sport and exercise physiologists, sport-performance researchers, and other sport scientists. The journal publishes authoritative peer-reviewed research in sport physiology and related disciplines, with an emphasis on work having direct practical applications in enhancing sport performance in sport physiology and related disciplines. IJSPP publishes 10 issues per year: January, February, March, April, May, July, August, September, October, and November.
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