Dr Andrew Garrett A.Garrett@hull.ac.uk
Senior Lecturer in Exercise and Environmental Physiology
Dr Andrew Garrett A.Garrett@hull.ac.uk
Senior Lecturer in Exercise and Environmental Physiology
Matt Birkett
Damien O. Gleadall-Siddall
Rachel Burke
Dr James Bray J.Bray@hull.ac.uk
Senior Lecturer in Sport Nutrition & Physiology
Fiona Nation
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.
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 |
Electronic ISSN | 2327-2937 |
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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