Abstract:
:Training at the load that maximizes peak mechanical power (Pmax) is considered superior for the development of power. We aimed to identify the Pmax load ('optimal load') in the jump squat and to quantify small, moderate, large, and very large substantial differences in power output across a spectrum of loads to identify loads that are substantially different to the optimal, and lastly, to investigate the nature of power production (load-force-velocity profiles). Professional Australian Rules Football (ARF; n = 16) and highly trained Rugby Union (RU; n = 20) players (subdivided into stronger [SP] vs. weaker [WP] players) performed jump squats across incremental loads (0-60 kg). Substantial differences in peak power (W·kg(-1)) were quantified as 0.2-2.0 of the log transformed between-athlete SD at each load, backtransformed and expressed as a percent with 90% confidence limits (CL). A 0-kg jump squat maximized peak power (ARF: 57.7 ± 10.8 W·kg(-1); RU: 61.4 ± 8.5 W·kg(-1); SP: 64.4 ± 7.5 W·kg(-1); WP: 54.8 ± 9.5 W·kg(-1)). The range for small to very large substantial differences in power output was 4.5-55.9% (CL: ×/÷1.36) and 2.8-32.4% (CL: ×/÷1.31) in ARF and RU players, whereas in SP and WP, it was 3.7-43.1% (CL: ×/÷1.32) and 4.3-51.7% (CL: ×/÷1.36). Power declined per 10-kg increment in load, 14.1% (CL: ±1.6) and 10.5% (CL: ±1.5) in ARF and RU players and 12.8% (CL: ±1.9) and 11.3% (CL: ±1.7) in SP and WP. The use of a 0-kg load is superior for the development of jump squat maximal power, with moderate to very large declines in power output observed at 10- to 60-kg loads. Yet, performance of heavier load jump squats that are substantially different to the optimal load are important in the development of sport-specific force-velocity qualities and should not be excluded.
journal_name
J Strength Cond Resjournal_title
Journal of strength and conditioning researchauthors
Nibali ML,Chapman DW,Robergs RA,Drinkwater EJdoi
10.1519/JSC.0b013e3182576febsubject
Has Abstractpub_date
2013-02-01 00:00:00pages
388-97issue
2eissn
1064-8011issn
1533-4287journal_volume
27pub_type
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journal_title:Journal of strength and conditioning research
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更新日期:2016-09-01 00:00:00
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journal_title:Journal of strength and conditioning research
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journal_title:Journal of strength and conditioning research
pub_type: 杂志文章
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更新日期:2020-07-01 00:00:00
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journal_title:Journal of strength and conditioning research
pub_type: 杂志文章
doi:10.1519/JSC.0b013e31815f5b7d
更新日期:2008-01-01 00:00:00
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journal_title:Journal of strength and conditioning research
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更新日期:2016-04-01 00:00:00
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journal_title:Journal of strength and conditioning research
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更新日期:2011-03-01 00:00:00
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journal_title:Journal of strength and conditioning research
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journal_title:Journal of strength and conditioning research
pub_type: 杂志文章
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更新日期:2020-06-17 00:00:00
abstract::This study aimed to (a) assess the reliability of the functional movement screening (FMS) protocol and (b) to establish changes in both FMS and tests of physical performance throughout a season. The reliability of the FMS components (12 in total) was assessed through a nonparametric statistical approach, based on 2 tr...
journal_title:Journal of strength and conditioning research
pub_type: 杂志文章
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更新日期:2016-04-01 00:00:00
abstract::Sanders, GJ, Boos, B, Rhodes, J, Peacock, CA, Kollock, RO, and Scheadler, CM. Variability of competition-based caloric expenditure and relative heart rates in National Collegiate Athletic Association Division I women's basketball. J Strength Cond Res XX(X): 000-000, 2019-Basketball athletes frequently engage in high i...
journal_title:Journal of strength and conditioning research
pub_type: 杂志文章
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更新日期:2019-12-27 00:00:00
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journal_title:Journal of strength and conditioning research
pub_type: 杂志文章
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更新日期:2009-11-01 00:00:00
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journal_title:Journal of strength and conditioning research
pub_type: 杂志文章
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更新日期:2018-01-01 00:00:00
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journal_title:Journal of strength and conditioning research
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doi:10.1519/JSC.0b013e31818ebb84
更新日期:2009-01-01 00:00:00
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journal_title:Journal of strength and conditioning research
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更新日期:2011-02-01 00:00:00
abstract::Elastic bands added to traditional free-weight techniques have become a part of suggested training routines in recent years. Because of the variable loading patterns of elastic bands (i.e., greater stretch produces greater resistance), it is necessary to quantify the exact loading patterns of bands to identify the vol...
journal_title:Journal of strength and conditioning research
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更新日期:2010-01-01 00:00:00
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更新日期:2018-02-01 00:00:00
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