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Performance Area => Article & Video Discussion => Topic started by: LBSS on July 17, 2011, 10:16:27 pm
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sample size small as shit so just food for thought. the university responsible can go fuck itself. i'd actually be curious to see this one. if anyone has journal access, please pm me:
http://www.ncbi.nlm.nih.gov/pubmed/21266733 (http://www.ncbi.nlm.nih.gov/pubmed/21266733)
Int J Sports Physiol Perform. 2010 Dec;5(4):484-96.
Relationship between relative net vertical impulse and jump height in jump squats performed to various squat depths and with various loads.
McBride JM, Kirby TJ, Haines TL, Skinner J.
Source
Department of Health, Leisure, and Exercise Science, Appalachian State University, Boone, NC, USA.
Abstract
PURPOSE:
The purpose of the current investigation was to determine the relationship between relative net vertical impulse (net vertical impulse (VI)) and jump height in the jump squat (JS) going to different squat depths and utilizing various loads.
METHODS:
Ten males with two years of jumping experience participated in this investigation (Age: 21.8 ± 1.9 y; Height: 176.9 ± 5.2 cm; Body Mass: 79.0 ± 7.1 kg, 1RM: 131.8 ± 29.5 kg, 1RM/BM: 1.66 ± 0.27). Subjects performed a series of static jumps (SJS) and countermovement jumps (CMJJS) with various loads (Body Mass, 20% of 1RM, 40% of 1RM) in a randomized fashion to a depth of 0.15, 0.30, 0.45, 0.60, and 0.75 m and a self-selected depth. During the concentric phase of each JS, peak force (PF), peak power (PP), jump height (JH) and relative VI were recorded and analyzed.
RESULTS:
Increasing squat depth corresponded to a decrease in PF and an increase in JH, relative VI for both SJS and CMJJS during all loads. Across all squat depths and loading conditions relative VI was statistically significantly correlated to JH in the SJS (r = .8956, P < .0001, power = 1.000) and CMJJS (r = .6007, P < .0001, power = 1.000). Across all squat depths and loading conditions PF was statistically nonsignificantly correlated to JH in the SJS (r = -0.1010, P = .2095, power = 0.2401) and CMJJS (r = -0.0594, P = .4527, power = 0.1131). Across all squat depths and loading conditions peak power (PP) was significantly correlated with JH during both the SJS (r = .6605, P < .0001, power = 1.000) and the CMJJS (r = .6631, P < .0001, power = 1.000). PP was statistically significantly higher at BM in comparison with 20% of 1RM and 40% of 1RM in the SJS and CMJJS across all squat depths.
CONCLUSIONS:
Results indicate that relative VI and PP can be used to predict JS performance, regardless of squat depth and loading condition. However, relative VI may be the best predictor of JS performance with PF being the worst predictor of JS performance.
also, this.
http://www.ncbi.nlm.nih.gov/pubmed/17127594 (http://www.ncbi.nlm.nih.gov/pubmed/17127594)
J Sports Sci. 2007 Jan 15;25(2):193-200.
The influence of squat depth on maximal vertical jump performance.
Domire ZJ, Challis JH.
Source
University of Wyoming, Laramie, WY 82071, USA. zdomire@uwyo.edu
Abstract
An increase in the period over which a muscle generates force can lead to the generation of greater force and, therefore, for example 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 simulated jumps 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 these jumps 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.
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Maybe I can get to it through USU's online journal thing. They have access to a ton of stuff, just haven't bothered looking through much of it.