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An investigation into the acute effects of depth jumps on maximal strength performance

Bullock, N and Comfort, P 2011, 'An investigation into the acute effects of depth jumps on maximal strength performance' , Journal of Strength and Conditioning Research, 25 (11) , pp. 3137-3141.

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Abstract

Research has demonstrated that high-load low-velocity (HLLV) exercises ($85% 1 repetition maximum [1RM]) increase performance in subsequent low-load high-velocity (LLHV) exercises, when separated by a rest period $4 minutes. To date, few studies have investigated LLHV exercises on subsequent HLLV exercises. The purpose of this study was to compare the effects of 2, 4, or 6 depth jumps (DJs) on subsequent 1RM back squat performance. Fourteen subjects (age 22 6 4 years, height 177 6 10 cm, body mass 80.3 6 14.4 kg) completed five 1RM back squat testing sessions, either control, retest, or 1 of 3 interventions (2, 4, or 6 DJs from a height of 33 cm, 4 minutes before the first 1RM attempt), in a counterbalanced order. Intraclass correlation coefficients demonstrated a high test–retest reliability for the 1RMs (r = 0.989, p , 0.001). Repeated-measures analysis of variance with Bonferroni post hoc analysis revealed significantly greater 1RM performance (140.71 6 35.68 kg: p = 0.004, 140.50 6 33.77 kg: p , 0.001, 141.43 6 34.39 kg: p = 0.002, respectively) for each intervention (2, 4, or 6 repetitions, respectively) compared to the control condition (132.43 6 34.56 kg). No significant differences were found between interventions (p . 0.05). The findings of this investigation demonstrate that the inclusion of 2, 4, or 6 DJs, 4 minutes before a maximal squat, enhances subsequent strength performance.

Item Type: Article
Themes: Health and Wellbeing
Schools: Colleges and Schools > College of Health & Social Care > School of Health Sciences > Centre for Health Sciences Research
Journal or Publication Title: Journal of Strength and Conditioning Research
Publisher: Lippincott, Williams & Wilkins
Refereed: Yes
ISSN: 1064-8011
Depositing User: P Comfort
Date Deposited: 24 Nov 2011 17:01
Last Modified: 20 Aug 2013 17:18
URI: http://usir.salford.ac.uk/id/eprint/19032

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