Optimizing heat acclimation for endurance athletes: High- versus low-intensity training

Schmit, C; Duffield, R; Hausswirth, C; Brisswalter, J; Le Meur, Y

Optimizing heat acclimation for endurance athletes: High- versus low-intensity training

Schmit, C Duffield, R

Hausswirth, C Brisswalter, J Le Meur, Y

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Publication Type:: Journal Article
Citation:: International Journal of Sports Physiology and Performance, 2018, 13 (6), pp. 816 - 823
Issue Date:: 2018-07-01

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Field	Value	Language
dc.contributor.author	Schmit, C	en_US
dc.contributor.author	Duffield, R https://orcid.org/0000-0002-5641-1314	en_US
dc.contributor.author	Hausswirth, C	en_US
dc.contributor.author	Brisswalter, J	en_US
dc.contributor.author	Le Meur, Y	en_US
dc.date.issued	2018-07-01	en_US
dc.identifier.citation	International Journal of Sports Physiology and Performance, 2018, 13 (6), pp. 816 - 823	en_US
dc.identifier.issn	1555-0265	en_US
dc.identifier.uri	http://hdl.handle.net/10453/129349
dc.description.abstract	© 2018 Human Kinetics, Inc. Purpose: To determine the effect of high- versus low-intensity training in the heat and ensuing taper period in the heat on endurance performance. Methods: In total, 19 well-trained triathletes undertook 5 days of normal training and a 1-wk taper including either low- (heat acclimation [HA-L], n = 10) or high-intensity (HA-H, n = 9) training sessions in the heat (30°C, 50% relative humidity). A control group (n = 10) reproduced their usual training in thermoneutral conditions. Indoor 20-km cycling time trials (35°C, 50% relative humidity) were performed before (Pre) and after the main heat exposure (Mid) and after the taper (Post). Results: Power output remained stable in the control group from Pre to Mid (effect size: −0.10 [0.26]) and increased from Mid to Post (0.18 [0.22]). The HA-L group demonstrated a progressive increase in performance from Pre to Mid (0.62 [0.33]) and from Mid to Post (0.53 [0.30]), alongside typical physiological signs of HA (reduced core temperature and heart rate and increased body-mass loss). While the HA-H group presented similar adaptations, increased perceived fatigue and decreased performance at Mid (−0.35 [0.26]) were evidenced and reversed at Post (0.50 [0.20]). No difference in power output was reported at Post between the HA-H and control groups. Conclusion: HA-H can quickly induce functional overreaching in nonacclimatized endurance athletes. As it was associated with a weak subsequent performance supercompensation, coaches and athletes should pay particular attention to training monitoring during a final preparation in the heat and reduce training intensity when early signs of functional overreaching are identified.	en_US
dc.relation.ispartof	International Journal of Sports Physiology and Performance	en_US
dc.relation.isbasedon	10.1123/ijspp.2017-0007	en_US
dc.subject.classification	Sport Sciences	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Body Mass Index	en_US
dc.subject.mesh	Perception	en_US
dc.subject.mesh	Acclimatization	en_US
dc.subject.mesh	Body Temperature Regulation	en_US
dc.subject.mesh	Heart Rate	en_US
dc.subject.mesh	Muscle Fatigue	en_US
dc.subject.mesh	Physical Endurance	en_US
dc.subject.mesh	Time Factors	en_US
dc.subject.mesh	Adult	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Physical Exertion	en_US
dc.subject.mesh	Hot Temperature	en_US
dc.subject.mesh	Physical Conditioning, Human	en_US
dc.subject.mesh	High-Intensity Interval Training	en_US
dc.title	Optimizing heat acclimation for endurance athletes: High- versus low-intensity training	en_US
dc.type	Journal Article
utslib.citation.volume	6	en_US
utslib.citation.volume	13	en_US
utslib.for	1106 Human Movement and Sports Sciences	en_US
utslib.for	1116 Medical Physiology	en_US
utslib.for	1701 Psychology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Health
pubs.organisational-group	/University of Technology Sydney/Faculty of Health/Sports and Exercise Science
pubs.organisational-group	/University of Technology Sydney/Strength - CHSP - Health Services and Practice
utslib.copyright.status	closed_access
pubs.issue	6	en_US
pubs.publication-status	Published	en_US
pubs.volume	13	en_US

Abstract:

© 2018 Human Kinetics, Inc. Purpose: To determine the effect of high- versus low-intensity training in the heat and ensuing taper period in the heat on endurance performance. Methods: In total, 19 well-trained triathletes undertook 5 days of normal training and a 1-wk taper including either low- (heat acclimation [HA-L], n = 10) or high-intensity (HA-H, n = 9) training sessions in the heat (30°C, 50% relative humidity). A control group (n = 10) reproduced their usual training in thermoneutral conditions. Indoor 20-km cycling time trials (35°C, 50% relative humidity) were performed before (Pre) and after the main heat exposure (Mid) and after the taper (Post). Results: Power output remained stable in the control group from Pre to Mid (effect size: −0.10 [0.26]) and increased from Mid to Post (0.18 [0.22]). The HA-L group demonstrated a progressive increase in performance from Pre to Mid (0.62 [0.33]) and from Mid to Post (0.53 [0.30]), alongside typical physiological signs of HA (reduced core temperature and heart rate and increased body-mass loss). While the HA-H group presented similar adaptations, increased perceived fatigue and decreased performance at Mid (−0.35 [0.26]) were evidenced and reversed at Post (0.50 [0.20]). No difference in power output was reported at Post between the HA-H and control groups. Conclusion: HA-H can quickly induce functional overreaching in nonacclimatized endurance athletes. As it was associated with a weak subsequent performance supercompensation, coaches and athletes should pay particular attention to training monitoring during a final preparation in the heat and reduce training intensity when early signs of functional overreaching are identified.

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http://hdl.handle.net/10453/129349