Heat-acclimatization and pre-cooling: a further boost for endurance performance?

Schmit, C; Le Meur, Y; Duffield, R; Robach, P; Oussedik, N; Coutts, AJ; Hausswirth, C

Heat-acclimatization and pre-cooling: a further boost for endurance performance?

Schmit, C Le Meur, Y Duffield, R

Robach, P Oussedik, N Coutts, AJ

Hausswirth, C

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Publication Type:: Journal Article
Citation:: Scandinavian Journal of Medicine and Science in Sports, 2017, 27 (1), pp. 55 - 65
Issue Date:: 2017-01-01

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Field	Value	Language
dc.contributor.author	Schmit, C	en_US
dc.contributor.author	Le Meur, Y	en_US
dc.contributor.author	Duffield, R https://orcid.org/0000-0002-5641-1314	en_US
dc.contributor.author	Robach, P	en_US
dc.contributor.author	Oussedik, N	en_US
dc.contributor.author	Coutts, AJ https://orcid.org/0000-0002-1782-7691	en_US
dc.contributor.author	Hausswirth, C	en_US
dc.date.available	2020-05-25T19:03:17Z
dc.date.issued	2017-01-01	en_US
dc.identifier.citation	Scandinavian Journal of Medicine and Science in Sports, 2017, 27 (1), pp. 55 - 65	en_US
dc.identifier.issn	0905-7188	en_US
dc.identifier.uri	http://hdl.handle.net/10453/41928
dc.description.abstract	© 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd To determine if pre-cooling (PC) following heat-acclimatization (HA) can further improve self-paced endurance performance in the heat, 13 male triathletes performed two 20-km cycling time-trials (TT) at 35 °C, 50% relative humidity, before and after an 8-day training camp, each time with (PC) or without (control) ice vest PC. Pacing strategies, physiological and perceptual responses were assessed during each TT. PC and HA induced moderate (+10 ± 18 W; effect size [ES] 4.4 ± 4.6%) and very large (+28 ± 19 W; ES 11.7 ± 4.1%) increases in power output (PO), respectively. The overall PC effect became unclear after HA (+4 ± 14 W; ES 1.4 ± 3.0%). However, pacing analysis revealed that PC remained transiently beneficial post-HA, i.e., during the first half of the TT. Both HA and PC pre-HA were characterized by an enhanced PO without increased cardio-thermoregulatory or perceptual disturbances, while post-HA PC only improved thermal comfort. PC improved 20-km TT performance in unacclimatized athletes, but an 8-day HA period attenuated the magnitude of this effect. The respective converging physiological responses to HA and PC may explain the blunting of PC effectiveness. However, perceptual benefits from PC can still account for the small alterations to pacing noted post-HA.	en_US
dc.relation.ispartof	Scandinavian Journal of Medicine and Science in Sports	en_US
dc.relation.isbasedon	10.1111/sms.12629	en_US
dc.subject.classification	Sport Sciences	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Cryotherapy	en_US
dc.subject.mesh	Cross-Over Studies	en_US
dc.subject.mesh	Random Allocation	en_US
dc.subject.mesh	Ice	en_US
dc.subject.mesh	Acclimatization	en_US
dc.subject.mesh	Body Temperature Regulation	en_US
dc.subject.mesh	Skin Temperature	en_US
dc.subject.mesh	Physical Endurance	en_US
dc.subject.mesh	Bicycling	en_US
dc.subject.mesh	Adult	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Athletic Performance	en_US
dc.subject.mesh	Hot Temperature	en_US
dc.title	Heat-acclimatization and pre-cooling: a further boost for endurance performance?	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	27	en_US
utslib.for	1106 Human Movement and Sports Sciences	en_US
utslib.for	1116 Medical Physiology	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
pubs.organisational-group	/University of Technology Sydney/Strength - CHT - Health Technologies
utslib.copyright.status	open_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	27	en_US

Abstract:

© 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd To determine if pre-cooling (PC) following heat-acclimatization (HA) can further improve self-paced endurance performance in the heat, 13 male triathletes performed two 20-km cycling time-trials (TT) at 35 °C, 50% relative humidity, before and after an 8-day training camp, each time with (PC) or without (control) ice vest PC. Pacing strategies, physiological and perceptual responses were assessed during each TT. PC and HA induced moderate (+10 ± 18 W; effect size [ES] 4.4 ± 4.6%) and very large (+28 ± 19 W; ES 11.7 ± 4.1%) increases in power output (PO), respectively. The overall PC effect became unclear after HA (+4 ± 14 W; ES 1.4 ± 3.0%). However, pacing analysis revealed that PC remained transiently beneficial post-HA, i.e., during the first half of the TT. Both HA and PC pre-HA were characterized by an enhanced PO without increased cardio-thermoregulatory or perceptual disturbances, while post-HA PC only improved thermal comfort. PC improved 20-km TT performance in unacclimatized athletes, but an 8-day HA period attenuated the magnitude of this effect. The respective converging physiological responses to HA and PC may explain the blunting of PC effectiveness. However, perceptual benefits from PC can still account for the small alterations to pacing noted post-HA.

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http://hdl.handle.net/10453/41928