文章基本信息

标题：Mechanical Differences between Barbell and Body Optimum Power Loads in the Jump Squat Exercise
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作者：Irineu Loturco ; Lucas A. Pereira ; Vinicius Zanetti 等
期刊名称：Journal of Human Kinetics
印刷版ISSN：1640-5544
电子版ISSN：1899-7562
出版年度：2016
卷号：54
期号：1
页码：153-162
DOI：10.1515/hukin-2016-0044
语种：English
出版社：Walter de Gruyter GmbH
摘要：This study compared the values of bar-peak force (PF_Bar) and power (PP_Bar), body-peak force (PF_Body) and power (PPBody) and bar-mean propulsive power (MPP_Bar) in different jump-squat (JS) conditions: unloaded condition (UC); bar-loaded condition (BLC) and optimum bar-MPP condition (OBC). Twenty-five soccer players performed the JS using a bar with negligible mass (UC), using the Smith-machine bar (BLC) and using the load capable of maximizing the bar-MPP (OBC). The PF_Body was significantly higher in the UC (2847.9 ± 489.1 N) than in the OBC (2655.4 ± 444.3 N). The UC presented greater PPBody (3775.9 ± 631.5 W) than the BLC (3359.7 ± 664.3 W) and OBC (3357.8 ± 625.3 W). The OBC presented higher values of PF_Bar, PP_Bar and MPP_Bar (676.2 ± 109.4 W) than the BLC (MPP_Bar = 425.8 ± 53.7 W) (all p < 0.05). In the OBC (compared to the UC), the body peak-power presented a reduction of ≈ 11%, while generating bar-power output from ≈ 59 to 73% higher than the BLC. While the fact that the body-peak power is maximized in the UC denotes a mechanical phenomenon, the bar-optimum load represents an intensity at which both components of the power equation (force and velocity) are optimized. This has important implications for sports training.
关键词：optimal loads ; muscle power ; ballistic ; plyometrics ; neuromuscular