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Effectiveness of short-term heat acclimation on intermittent sprint performance in the heat with moderately trained males.

Garrett, Andrew T.; Birkett, Matt; Gleadall-Siddall, Damien O.; Burke, Rachel; Bray, James; Nation, Fiona

Authors

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Dr Andrew Garrett A.Garrett@hull.ac.uk
Senior Lecturer in Exercise and Environmental Physiology

Matt Birkett

Damien O. Gleadall-Siddall

Rachel Burke

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Dr James Bray J.Bray@hull.ac.uk
Lecturer in Sport Nutrition & Physiology

Fiona Nation



Abstract

Introduction: Effectiveness of short-term heat acclimation (STHA), over 5-days (permissive dehydration), on intermittent heat stress test (HST) with males.

Methods: Ten, moderately-trained, males (mean [SD]; age 25.6 [8.9] y; stature 180.7 [5.6] cm; body mass 83.2 [10.8] kg; and 45.3 [6.5] mL.kg-1.min-1) participated. The HST was 9 x 5min (45-min) of intermittent exercise based on professional soccer players. One week apart, HST1 vs HST (11.0°C; 50%RH), as a reliability trial and HST3 in 31.0°C; 50%RH were completed. Then 90 min dehydration, STHA (no fluid intake), for 5 consecutive days (39.5oC; 60%RH), using controlled-hyperthermia (~rectal temperature [Tre] 38.5oC). The HST4 within one week after STHA. Blood plasma constituents: percent plasma volume (%PV), aldosterone, total protein, albumin, electrolytes, cortisol and HSP70. Data analysis reported as mean differences with 95% confidence intervals (95%CI) and Cohen’s d effect size.

Results: Post STHA, there was a decrease of -0.20 Tre at 45-min in the HST (95%CI -0.40 to -0.05°C; P=0.03; d =-0.56); mean skin temperature (-0.80; -1.30 to -0.30°C; P=0.007; d =-1.46) and mean body temperature (-0.30; -0.50 to -0.10°C, P=0.01; d =-0.75). Cardiac frequency reduced (-3: -5 to -1 b.min-1; P=0.01; d =-0.20) and %PV increased (7.3: 0.9 to 13.7%; P=0.03; d=0.59). Mean Peak Power (MPO) increased (P<0.05) across sprints 7, 8 and 9. Time to exhaustion increased (167: -15 to 350 s; P=0.06; d =0.63).

Conclusions: Short-term heat acclimation (5-days) with dehydration, using controlled-hyperthermia technique, is effective for physiological adaptations during intermittent exercise in the heat, with moderately-trained males.

Citation

Garrett, A. T., Birkett, M., Gleadall-Siddall, D. O., Burke, R., Bray, J., & Nation, F. (2022). Effectiveness of short-term heat acclimation on intermittent sprint performance in the heat with moderately trained males. Journal of Human Performance in Extreme Environments, 17(1), Article 4. https://doi.org/10.7771/2327-2937.1139

Journal Article Type Article
Acceptance Date Nov 29, 2021
Online Publication Date May 9, 2022
Publication Date 2022
Deposit Date Apr 4, 2022
Publicly Available Date May 11, 2022
Journal Journal of Human Performance in Extreme Environments
Print ISSN 1529-5168
Publisher Purdue University Press
Peer Reviewed Peer Reviewed
Volume 17
Issue 1
Article Number 4
DOI https://doi.org/10.7771/2327-2937.1139
Keywords Intermittent; Males; Dehydration; Fluid-regulation; Plasma volume
Public URL https://hull-repository.worktribe.com/output/3887721

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https://creativecommons.org/licenses/by-nc-nd/4.0/

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This is an Open Access journal. This means that it uses a funding model that does not charge readers or their institutions for access. Readers may freely read, download, copy, distribute, print, search, or link to the full texts of articles. This journal is covered under the CC BY-NC-ND license.



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