Effects of mild heat exposure on fatigue responses during two sets of repeated sprints matched for initial mechanical output

J. Soo; S. Racinais; D.J. Bishop; O. Girard

doi:10.1016/j.jsams.2021.09.009

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Effects of mild heat exposure on fatigue responses during two sets of repeated sprints matched for initial mechanical output

Journal article

Peer reviewed

Effects of mild heat exposure on fatigue responses during two sets of repeated sprints matched for initial mechanical output

J. Soo, S. Racinais, D.J. Bishop and O. Girard

Journal of Science and Medicine in Sport, Vol.25(3), pp.P249-P254

2022

DOI: https://doi.org/10.1016/j.jsams.2021.09.009

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Abstract

Objectives We examined whether mild heat exposure alters performance, perceptual responses and neural drive to the quadriceps during two sets of repeated sprints matched for initial mechanical output. Design Repeated measures. Methods Twelve males performed 10 × 6-s sprints (recovery = 30 s), followed 6 min later by 5 × 6-s sprints (recovery = 30 s) in either COOL (24 °C/30% rH) or HOT (35 °C/40% rH) conditions. Subsequently, two sets of five consecutive sprints matched for initial mechanical output were compared. Results On the basis of peak power, performance in sprint 2 was not significantly different to sprint 11 in both conditions (p ≥ 0.32). Average peak power across the five sprints compared (i.e., sprints 2–6 and 11–15, respectively) was 2.6 ± 3.4% higher in HOT compared to COOL (p = 0.025). Electromyographic activity (root mean square value) of the vastus lateralis muscle remained unchanged. Core (sprints 2–6: 37.85 ± 0.21 vs. 37.53 ± 0.19 °C, sprints 11–15: 38.26 ± 0.33 vs. 37.89 ± 0.24 °C; p < 0.001) and skin (sprints 2–6: 36.21 ± 0.29 vs. 30.72 ± 0.52 °C, sprints 11–15: 36.37 ± 0.28 vs. 30.99 ± 0.55 °C; p < 0.001) temperatures were overall higher in HOT compared to COOL. Heart rate, thermal sensation and comfort were significantly elevated in HOT compared to COOL (p ≤ 0.02), irrespective of sprint number. Conclusions When two sets of repeated sprints were matched for initial mechanical output, performance was enhanced with mild heat exposure. This occurred despite higher thermal, cardiovascular, and perceptual strain, and without alterations in quadriceps neural drive.

Details

Title: Effects of mild heat exposure on fatigue responses during two sets of repeated sprints matched for initial mechanical output
Authors/Creators: J. Soo (Author/Creator) - Murdoch University
S. Racinais (Author/Creator) - Qatar Orthopaedic and Sports Medicine Hospital
D.J. Bishop (Author/Creator) - Australian Institute of Sport
O. Girard (Author/Creator) - Qatar Orthopaedic and Sports Medicine Hospital
Publication Details: Journal of Science and Medicine in Sport, Vol.25(3), pp.P249-P254
Publisher: Elsevier Ltd
Identifiers: 991005541893107891
Copyright: © 2021 Sports Medicine Australia.
Murdoch Affiliation: Murdoch Applied Sports Science Laboratory
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 1 Clinical & Life Sciences; 1.172 Sports Science; 1.172.823 Thermoregulation
Web Of Science research areas: Sport Sciences
ESI research areas: Clinical Medicine