Force-time characteristics of repeated bouts of depth jumps and the effects of compression garments

Freddy Brown; Mathew Hill; Derek Renshaw; Jason Tallis

doi:10.1123/jab.2023-0221

Force-time characteristics of repeated bouts of depth jumps and the effects of compression garments

Freddy Brown, Mathew Hill, Derek Renshaw, Jason Tallis

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Abstract

No studies have reported ground-reaction force (GRF) profiles of the repeated depth-jump (DJ) protocols commonly used to study exercise-induced muscle damage (EIMD). Furthermore, whilst compression garments (CG) may accelerate recovery from EIMD, any effects on the repeated-bout effect are unknown. Therefore, we investigated the GRF profiles of two repeated bouts of damage-inducing DJs, and the effects of wearing CG for recovery. Non-resistance trained males randomly received CG (n=9) or placebo (n=8) for 72 h recovery, following 20 x 20 m sprints and 10 x 10 DJs from 0.6 m. Exercise was repeated after 14 days. Using a three-way (set x bout x group) design, changes in GRF were assessed with ANOVA and statistical parametric mapping (SPM). Jump height, reactive strength, peak and mean propulsive forces declined between sets (p<0.001). Vertical stiffness, contact time, force at zero velocity and propulsive duration increased (p<0.05). According to SPM, braking (17–25% of the movement), and propulsive forces (58–81%) declined (p<0.05). During the repeated bout, peak propulsive force and duration increased (p<0.05), whilst mean propulsive force (p<0.05) and GRF from 59–73% declined (p<0.001). A repeated bout of DJs differed in propulsive GRF, without changes to the eccentric phase, or effects from CG.

Original language	English
Pages (from-to)	217-231
Number of pages	15
Journal	Journal of Applied Biomechanics
Volume	40
Issue number	3
Early online date	5 Apr 2024
DOIs	https://doi.org/10.1123/jab.2023-0221
Publication status	Published - Jun 2024

Bibliographical note

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

This document is the author’s post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it.

Keywords

adaptation
muscle damage
performance
recovery
strength

ASJC Scopus subject areas

Medicine(all)

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10.1123/jab.2023-0221

Brown2024AAM Accepted author manuscript, 1.76 MB

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title = "Force-time characteristics of repeated bouts of depth jumps and the effects of compression garments",

abstract = "No studies have reported ground-reaction force (GRF) profiles of the repeated depth-jump (DJ) protocols commonly used to study exercise-induced muscle damage (EIMD). Furthermore, whilst compression garments (CG) may accelerate recovery from EIMD, any effects on the repeated-bout effect are unknown. Therefore, we investigated the GRF profiles of two repeated bouts of damage-inducing DJs, and the effects of wearing CG for recovery. Non-resistance trained males randomly received CG (n=9) or placebo (n=8) for 72 h recovery, following 20 x 20 m sprints and 10 x 10 DJs from 0.6 m. Exercise was repeated after 14 days. Using a three-way (set x bout x group) design, changes in GRF were assessed with ANOVA and statistical parametric mapping (SPM). Jump height, reactive strength, peak and mean propulsive forces declined between sets (p<0.001). Vertical stiffness, contact time, force at zero velocity and propulsive duration increased (p<0.05). According to SPM, braking (17–25% of the movement), and propulsive forces (58–81%) declined (p<0.05). During the repeated bout, peak propulsive force and duration increased (p<0.05), whilst mean propulsive force (p<0.05) and GRF from 59–73% declined (p<0.001). A repeated bout of DJs differed in propulsive GRF, without changes to the eccentric phase, or effects from CG.",

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note = "Copyright {\textcopyright} and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders. This document is the author{\textquoteright}s post-print version, incorporating any revisions agreed during the peer-review process. Some differences between the published version and this version may remain and you are advised to consult the published version if you wish to cite from it. ",

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N2 - No studies have reported ground-reaction force (GRF) profiles of the repeated depth-jump (DJ) protocols commonly used to study exercise-induced muscle damage (EIMD). Furthermore, whilst compression garments (CG) may accelerate recovery from EIMD, any effects on the repeated-bout effect are unknown. Therefore, we investigated the GRF profiles of two repeated bouts of damage-inducing DJs, and the effects of wearing CG for recovery. Non-resistance trained males randomly received CG (n=9) or placebo (n=8) for 72 h recovery, following 20 x 20 m sprints and 10 x 10 DJs from 0.6 m. Exercise was repeated after 14 days. Using a three-way (set x bout x group) design, changes in GRF were assessed with ANOVA and statistical parametric mapping (SPM). Jump height, reactive strength, peak and mean propulsive forces declined between sets (p<0.001). Vertical stiffness, contact time, force at zero velocity and propulsive duration increased (p<0.05). According to SPM, braking (17–25% of the movement), and propulsive forces (58–81%) declined (p<0.05). During the repeated bout, peak propulsive force and duration increased (p<0.05), whilst mean propulsive force (p<0.05) and GRF from 59–73% declined (p<0.001). A repeated bout of DJs differed in propulsive GRF, without changes to the eccentric phase, or effects from CG.

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Force-time characteristics of repeated bouts of depth jumps and the effects of compression garments

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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