Temperate performance and metabolic adaptations following endurance training performed under environmental heat stress
Abstract Endurance 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 random...
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2021-05-01
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| Series: | Physiological Reports |
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| Online Access: | https://doi.org/10.14814/phy2.14849 |
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doaj-79c28f117be2402287d61f4c2dd7e8322021-05-15T16:41:04ZengWileyPhysiological Reports2051-817X2021-05-0199n/an/a10.14814/phy2.14849Temperate performance and metabolic adaptations following endurance training performed under environmental heat stressEd Maunder0Daniel J. Plews1Gareth A. Wallis2Matthew J. Brick3Warren B. Leigh4Wee‐Leong Chang5Casey M. Watkins6Andrew E. Kilding7Sports Performance Research Institute New ZealandAuckland University of Technology Auckland New ZealandSports Performance Research Institute New ZealandAuckland University of Technology Auckland New ZealandSchool of Sport, Exercise, and Rehabilitation Sciences University of Birmingham Birmingham UKOrthosports North HarbourAUT Millennium Auckland New ZealandOrthosports North HarbourAUT Millennium Auckland New ZealandFaculty of Health and Environmental Sciences Auckland University of Technology Auckland New ZealandSports Performance Research Institute New ZealandAuckland University of Technology Auckland New ZealandSports Performance Research Institute New ZealandAuckland University of Technology Auckland New ZealandAbstract Endurance 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.https://doi.org/10.14814/phy2.14849adaptationendurance trainingheat stressmitochondriaperformance |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Ed Maunder Daniel J. Plews Gareth A. Wallis Matthew J. Brick Warren B. Leigh Wee‐Leong Chang Casey M. Watkins Andrew E. Kilding |
| spellingShingle |
Ed Maunder Daniel J. Plews Gareth A. Wallis Matthew J. Brick Warren B. Leigh Wee‐Leong Chang Casey M. Watkins Andrew E. Kilding Temperate performance and metabolic adaptations following endurance training performed under environmental heat stress Physiological Reports adaptation endurance training heat stress mitochondria performance |
| author_facet |
Ed Maunder Daniel J. Plews Gareth A. Wallis Matthew J. Brick Warren B. Leigh Wee‐Leong Chang Casey M. Watkins Andrew E. Kilding |
| author_sort |
Ed Maunder |
| title |
Temperate performance and metabolic adaptations following endurance training performed under environmental heat stress |
| title_short |
Temperate performance and metabolic adaptations following endurance training performed under environmental heat stress |
| title_full |
Temperate performance and metabolic adaptations following endurance training performed under environmental heat stress |
| title_fullStr |
Temperate performance and metabolic adaptations following endurance training performed under environmental heat stress |
| title_full_unstemmed |
Temperate performance and metabolic adaptations following endurance training performed under environmental heat stress |
| title_sort |
temperate performance and metabolic adaptations following endurance training performed under environmental heat stress |
| publisher |
Wiley |
| series |
Physiological Reports |
| issn |
2051-817X |
| publishDate |
2021-05-01 |
| description |
Abstract Endurance 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. |
| topic |
adaptation endurance training heat stress mitochondria performance |
| url |
https://doi.org/10.14814/phy2.14849 |
| work_keys_str_mv |
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