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Effectiveness of short term heat acclimation on intermittent sprint performance with moderately trained females controlling for menstrual cycle phase
Garrett, A.T. Dodd, E. Biddlecombe, V. Gleadall-Siddall, D. Burke, R. Shaw, J. Bray, J. Abt, G. Gritt, J.
Garrett, A.T.
Dodd, E.
Biddlecombe, V.
Gleadall-Siddall, D.
Burke, R.
Shaw, J.
Bray, J.
Abt, G.
Gritt, J.
Publication Date
2019-11
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© 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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openAccess
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2019-11-12
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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.
Materials 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; VO˙
2 peak 43.9 [8.6] mL·kg−1
·min−1
)
participated. The HST (31.0◦C; 50%RH) was 9 × 5 min (45-min) of intermittent exercise,
based on exercise intensities of female soccer players, using a motorized treadmill and
Wattbike. Participants completed HST1 vs. HST2 as a control (C) trial. Followed by
90 min, STHA (no fluid intake), for five consecutive days in 39.5◦C; 60%RH, using
controlled-hyperthermia (∼rectal temperature [Tre] 38.5◦C). The HST3 occurred within
1 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 Tre by
0.20◦C (95%CI −0.30 to −0.10◦C; d = 0.77); Tsk (−0.50; −0.90 to −0.10◦C; d = 0.80);
and Tb (−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.
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Citation
Garrett AT, Dodd E, Biddlecombe V et al (2019) Effectiveness of short-term heat acclimation on intermittent sprint performance with moderately trained females controlling for menstrual cycle phase. Frontiers in Physiology. 10: 1458.
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