Squat a

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This article was downloaded by: [b-on: Biblioteca do conhecimento online IPLeiria] On: 03 December 2012, At: 11:04 Publisher: Routledge Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK

Journal of Sports Sciences
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The influence of squat depth on maximal vertical jump performance
Zachary J. Domire & John H. Challis
a b a b

University of Wyoming, Laramie, WY

Biomechanics Laboratory, Pennsylvania State University, University Park, PA, USA Version of record first published: 18 Feb 2007.

To cite this article: Zachary J. Domire & John H. Challis (2007): Theinfluence of squat depth on maximal vertical jump performance, Journal of Sports Sciences, 25:2, 193-200 To link to this article: http://dx.doi.org/10.1080/02640410600630647

PLEASE SCROLL DOWN FOR ARTICLE Full terms and conditions of use: http://www.tandfonline.com/page/terms-and-conditions This article may be used for research, teaching, and private study purposes. Any substantial or systematicreproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primarysources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.

Journal of Sports Sciences, January 15th 2007; 25(2): 193 – 200

The influence of squat depth on maximal vertical jump performance


University of Wyoming, Laramie, WY and 2Biomechanics Laboratory, Pennsylvania State University, University Park, PA, USA (Accepted 9 February 2006)

Downloaded by [b-on: Biblioteca do conhecimento online IPLeiria] at 11:04 03 December 2012

Abstract An increase in the period over which a muscle generates force can lead to the generation of greater force and, therefore, forexample in jumping, to greater jump height. The aim of this study was to examine the effect of squat depth on maximum vertical jump performance. We hypothesized that jump height would increase with increasing depth of squat due to the greater time available for the generation of muscular force. Ten participants performed jumps from preferred and deep squat positions. A computer model simulatedjumps from the different starting postures. The participants showed no difference in jump height in jumps from deep and preferred positions. Simulated jumps produced similar kinematics to the participants’ jumps. The optimal squat depth for the simulated jumps was the lowest position the model was able to jump from. Because jumping from a deep squat is rarely practised, it is unlikely that thesejumps were optimally coordinated by the participants. Differences in experimental vertical ground reaction force patterns also suggest that jumps from a deep squat are not optimally coordinated. These results suggest there is the potential for athletes to increase jump performance by exploiting a greater range of motion.

Keywords: Computer simulation, biomechanics, coordination, jumpingIntroduction Maximum vertical jumping has received considerable attention in the biomechanics literature (e.g. Alexander, 1990; Challis, 1998; Van Soest, Schwab, Bobbert, & Van Ingen Schenau, 1993), and much is known about optimal performance (Pandy & Zajac 1991). The increase in jump height for jumps commenced with a countermovement, compared with jumps begun from an initial squat position, has been...
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