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

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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 languageEnglish
Pages (from-to)(In-Press)
Number of pages25
JournalJournal of Applied Biomechanics
Volume(In-Press)
Early online date5 Apr 2024
DOIs
Publication statusE-pub ahead of print - 5 Apr 2024

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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

  • Adaption
  • Recovery
  • Compression
  • Performance
  • Strength
  • Muscle damage

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