Heat acclimation for female endurance performance in hot and cool conditions

Kirby, Nathalie (2018). Heat acclimation for female endurance performance in hot and cool conditions. University of Birmingham. M.Sc.

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This study compared the effects of heat acclimation (HA) on female endurance performance following short-term (4-5 days; STHA) plus long-term (9-10 days; LTHA) heat acclimation, as well as examined HA’s ergogenic potential in females. Seven female recreational endurance athletes completed 10-days isothermic HA (40°C, 30%RH), and a 15-minute selfpaced time trial (TT) in hot (HTT; 35°C, 30%RH) and cool conditions (CTT; 15°C, 30%RH), before (1) and after STHA (2) plus LTHA (3). Following LTHA, distance cycled (hot: +260±150 m (3.3%), P=0.017; cool: +210±150 m, (2.4%), P=0.038) and mean power output (hot: +10.4±7.4 W (5.5%) P=0.015; cool: +10.7±7.7 W (6.8%) P= 0.040) were increased.
Area under the curve (AUC) differences were observed in power output across CTT1 vs. CTT3 (P=0.034) and HTT1 vs. HTT3 (P=0.016). Body mass loss (+2.6±0.5% to 3.2±0.5%; P=0.034), sweat rate relative to body surface area (+613±105 g/h/m2 to 772±114 g/h/m2; P=0.018) and active sweat glands/sq. inch (395±135 to 494±157; P=0.016) increased following LTHA. Tre was lower (AUC; P=0.036) during CTT3 vs. CTT1. Other thermoregulatory, cardiovascular, and blood lactate measures were not different between TTs (P>0.05). No significant performance or physiological improvements were observed following STHA (P>0.05). The lack of physiological or performance effect following STHA indicates that females require LTHA to augment performance in the heat. Meaningful performance improvements in cool conditions further support HA’s ergogenic potential.

Type of Work: Thesis (Masters by Research > M.Sc.)
Award Type: Masters by Research > M.Sc.
Licence: All rights reserved
College/Faculty: Colleges (2008 onwards) > College of Life & Environmental Sciences
School or Department: School of Sport, Exercise and Rehabilitation Sciences
Funders: None/not applicable
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure
URI: http://etheses.bham.ac.uk/id/eprint/8896


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