Temperate Performance and Metabolic Adaptations Following Endurance Training Performed Under Environmental Heat Stress

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aut.relation.endpagee14849
aut.relation.issue9en_NZ
aut.relation.journalPhysiological Reportsen_NZ
aut.relation.startpagee14849
aut.relation.volume9en_NZ
aut.researcherDrabsch, Julie
dc.contributor.authorMaunder, Een_NZ
dc.contributor.authorPlews, DJen_NZ
dc.contributor.authorWallis, GAen_NZ
dc.contributor.authorBrick, MJen_NZ
dc.contributor.authorLeigh, WBen_NZ
dc.contributor.authorChang, W-Len_NZ
dc.contributor.authorWatkins, CMen_NZ
dc.contributor.authorKilding, AEen_NZ
dc.date.accessioned2021-06-15T22:46:51Z
dc.date.available2021-06-15T22:46:51Z
dc.date.copyright2021en_NZ
dc.date.issued2021en_NZ
dc.description.abstractEndurance athletes are frequently exposed to environmental heat stress during training. We investigated whether exposure to 33°C during training would improve endurance performance in temperate conditions and stimulate mitochondrial adaptations. Seventeen endurance-trained males were randomly assigned to perform a 3-week training intervention in 18°C (TEMP) or 33°C (HEAT). An incremental test and 30-min time-trial preceded by 2-h low-intensity cycling were performed in 18°C pre- and post-intervention, along with a resting vastus lateralis microbiopsy. Training was matched for relative cardiovascular demand using heart rates measured at the first and second ventilatory thresholds, along with a weekly "best-effort" interval session. Perceived training load was similar between-groups, despite lower power outputs during training in HEAT versus TEMP (p < .05). Time-trial performance improved to a greater extent in HEAT than TEMP (30 ± 13 vs. 16 ± 5 W, N = 7 vs. N = 6, p = .04), and citrate synthase activity increased in HEAT (fold-change, 1.25 ± 0.25, p = .03, N = 9) but not TEMP (1.10 ± 0.22, p = .22, N = 7). Training-induced changes in time-trial performance and citrate synthase activity were related (r = .51, p = .04). A group × time interaction for peak fat oxidation was observed (Δ 0.05 ± 0.14 vs. -0.09 ± 0.12 g·min-1 in TEMP and HEAT, N = 9 vs. N = 8, p = .05). Our data suggest exposure to moderate environmental heat stress during endurance training may be useful for inducing adaptations relevant to performance in temperate conditions.en_NZ
dc.identifier.citationPhysiological Reports, 9(9), e14849.
dc.identifier.doi10.14814/phy2.14849en_NZ
dc.identifier.issn2051-817Xen_NZ
dc.identifier.urihttps://hdl.handle.net/10292/14269
dc.languageengen_NZ
dc.publisherWileyen_NZ
dc.relation.urihttps://physoc.onlinelibrary.wiley.com/doi/10.14814/phy2.14849
dc.rights© 2021 The Authors. Physiological Reports published by Wiley Periodicals LLC on behalf of The Physiological Society and the American Physiological Society This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
dc.rights.accessrightsOpenAccessen_NZ
dc.subjectAdaptationen_NZ
dc.subjectEndurance trainingen_NZ
dc.subjectHeat stressen_NZ
dc.subjectMitochondriaen_NZ
dc.subjectPerformanceen_NZ
dc.titleTemperate Performance and Metabolic Adaptations Following Endurance Training Performed Under Environmental Heat Stressen_NZ
dc.typeJournal Article
pubs.elements-id430304
pubs.organisational-data/AUT
pubs.organisational-data/AUT/Faculty of Health & Environmental Science
pubs.organisational-data/AUT/Faculty of Health & Environmental Science/School of Science
pubs.organisational-data/AUT/Faculty of Health & Environmental Science/School of Science/Biomedicine & Medical Diagnostics Department
pubs.organisational-data/AUT/Faculty of Health & Environmental Science/School of Sport & Recreation
pubs.organisational-data/AUT/Faculty of Health & Environmental Science/School of Sport & Recreation/Sport & Exercise Science Department
pubs.organisational-data/AUT/Faculty of Health & Environmental Science/School of Sport & Recreation/Sports Performance Research Institute New Zealand
pubs.organisational-data/AUT/Faculty of Health & Environmental Science/School of Sport & Recreation/Sports Performance Research Institute New Zealand/Sports Physiology & Nutrition Research Group
pubs.organisational-data/AUT/PBRF
pubs.organisational-data/AUT/PBRF/PBRF Health and Environmental Sciences
pubs.organisational-data/AUT/PBRF/PBRF Health and Environmental Sciences/HS Sports & Recreation 2018 PBRF
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