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Effectiveness of Short-Term Heat Acclimation on Intermittent Sprint Performance With Moderately Trained Females Controlling for Menstrual Cycle Phase

Garrett, Andrew; Dodd, Edward; Biddlecombe, Victoria; Gleadall-Siddall, Damien; Burke, Rachel; Shaw, Jake; Bray, James; Jones, Huw; Abt, Grant; Gritt, Jarrod

Authors

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

Edward Dodd

Victoria Biddlecombe

Damien Gleadall-Siddall

Rachel Burke

Jake Shaw

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Dr James Bray J.Bray@hull.ac.uk
Lecturer in Sport and Exercise Nutrition

Huw Jones

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Dr Grant Abt G.Abt@hull.ac.uk
Reader in Sport and Exercise Physiology and Head of Department for Sport, Health and Exercise Science

Jarrod Gritt



Abstract

Introduction: Investigate the effectiveness of short-term heat acclimation (STHA), over 5-days (permissive dehydration), on an intermittent sprint exercise protocol (HST) with females. Controlling for menstrual cycle phase. Material and methods: Ten, moderately-trained, females (Mean [SD]; age 22.6 [2.7] y; stature 165.3 [6.2] cm; body mass 61.5 [8.7] kg; 43.9 [8.6] mL.kg-1.min-1) participated. The HST (31.0°C; 50%RH) was 9 x 5min (45-min) of intermittent exercise, based on exercise intensities of female soccer players, using a motorised treadmill and Wattbike. Participants completed HST1 vs HST2 as a control (C) trial. Followed by 90 min, STHA (no fluid intake), for 5 consecutive days in 39.5oC; 60%RH, using controlled-hyperthermia (~rectal temperature [Tre] 38.5oC). The HST3 occurred within one week after STHA. The HST2 vs HST3 trials were in the luteal phase, using self-reported menstrual questionnaire and plasma 17β-estradiol. Results: Pre (HST2) vs post (HST3) STHA there was a reduction at 45-min in by 0.20°C (95%CI -0.30 to -0.10°C; d =0.77); (-0.50; -0.90 to -0.10°C; d =0.80); and (-0.25; -0.35 to -0.15°C; d =0.92). Cardiac frequency reduced at 45-min (-8; -16 to -1 b.min-1; d = 1.11) and %PV increased (7.0; -0.4 to 14.5%: d =1.27). Mean power output increased across all nine maximal sprints by 56W (-26 to 139W; d =0.69; n=9). There was limited difference (P>0.05) for these measures in HST1 vs HST2 C trial. Discussion: Short-term heat acclimation (5-days) using controlled-hyperthermia, leads to physiological adaptation during intermittent exercise in the heat, in moderately trained females when controlling for menstrual cycle phase.

Journal Article Type Article
Publication Date Nov 29, 2019
Journal Frontiers in Physiology
Electronic ISSN 1664-042X
Publisher Frontiers Media
Peer Reviewed Peer Reviewed
Volume 10
Article Number 1458
APA6 Citation Garrett, A., Dodd, E., Biddlecombe, V., Gleadall-Siddall, D., Burke, R., Shaw, J., …Gritt, J. (2019). Effectiveness of Short-Term Heat Acclimation on Intermittent Sprint Performance With Moderately Trained Females Controlling for Menstrual Cycle Phase. Frontiers in Physiology, 10, https://doi.org/10.3389/fphys.2019.01458
DOI https://doi.org/10.3389/fphys.2019.01458
Keywords Female; Menstrual cycle; Dehydration; Fluid-regulation; Plasma volume
Publisher URL https://www.frontiersin.org/articles/10.3389/fphys.2019.01458/full

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Copyright Statement
Copyright © 2019 Garrett, Dodd, Biddlecombe, Gleadall-Siddall, Burke, Shaw, Bray, Jones, Abt and Gritt. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.





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