Physiological and performance responses to a training camp in the heat in professional Australian football players

Racinais, S; Buchheit, M; Bilsborough, J; Bourdon, PC; Cordy, J; Coutts, AJ

Physiological and performance responses to a training camp in the heat in professional Australian football players

Racinais, S Buchheit, M Bilsborough, J Bourdon, PC Cordy, J Coutts, AJ

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Publication Type:: Journal Article
Citation:: International Journal of Sports Physiology and Performance, 2014, 9 (4), pp. 598 - 603
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Racinais, S	en_US
dc.contributor.author	Buchheit, M	en_US
dc.contributor.author	Bilsborough, J	en_US
dc.contributor.author	Bourdon, PC	en_US
dc.contributor.author	Cordy, J	en_US
dc.contributor.author	Coutts, AJ https://orcid.org/0000-0002-1782-7691	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	International Journal of Sports Physiology and Performance, 2014, 9 (4), pp. 598 - 603	en_US
dc.identifier.issn	1555-0265	en_US
dc.identifier.uri	http://hdl.handle.net/10453/114625
dc.description.abstract	Purpose: To examine the physiological and performance responses to a heat-acclimatization camp in highly trained professional team-sport athletes. Methods: Eighteen male Australian Rules Football players trained for 2 wk in hot ambient conditions (31-33°C, humidity 34-50%). Players performed a laboratory-based heat-response test (24-min walk + 24 min seated; 44°C), a YoYo Intermittent Recovery Level 2 Test (YoYoIR2; indoor, temperate environment, 23°C) and standardized training drills (STD; outdoor, hot environment, 32°C) at the beginning and end of the camp. Results: The heat-response test showed partial heat acclimatization (eg, a decrease in skin temperature, heart rate, and sweat sodium concentration, P <.05). In addition, plasma volume (PV, CO rebreathing, +2.68 [0.83; 4.53] mL/kg) and distance covered during both the YoYoIR2 (+311 [260; 361] m) and the STD (+45.6 [13.9; 77.4] m) increased postcamp (P <.01). None of the performance changes showed clear correlations with PV changes (r <.24), but the improvements in running STD distance in hot environment were correlated with changes in hematocrit during the heat-response test (r = -.52, 90%CI [-.77; -.12]). There was no clear correlation between the performance improvements in temperate and hot ambient conditions (r <.26). Conclusion: Running performance in both hot and temperate environments was improved after a football training camp in hot ambient conditions that stimulated heat acclimatization. However, physiological and performance responses were highly individual, and the absence of correlations between physical-performance improvements in hot and temperate environments suggests that their physiological basis might differ. © 2014 Human Kinetics, Inc.	en_US
dc.relation.ispartof	International Journal of Sports Physiology and Performance	en_US
dc.relation.isbasedon	10.1123/IJSPP.2013-0284	en_US
dc.subject.classification	Sport Sciences	en_US
dc.subject.mesh	Sweat	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Sodium	en_US
dc.subject.mesh	Exercise Test	en_US
dc.subject.mesh	Task Performance and Analysis	en_US
dc.subject.mesh	Motor Skills	en_US
dc.subject.mesh	Humidity	en_US
dc.subject.mesh	Acclimatization	en_US
dc.subject.mesh	Sweating	en_US
dc.subject.mesh	Skin Temperature	en_US
dc.subject.mesh	Plasma Volume	en_US
dc.subject.mesh	Heart Rate	en_US
dc.subject.mesh	Respiration	en_US
dc.subject.mesh	Physical Endurance	en_US
dc.subject.mesh	Running	en_US
dc.subject.mesh	Time Factors	en_US
dc.subject.mesh	Sports	en_US
dc.subject.mesh	Australia	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Hot Temperature	en_US
dc.subject.mesh	Young Adult	en_US
dc.subject.mesh	Physical Conditioning, Human	en_US
dc.title	Physiological and performance responses to a training camp in the heat in professional Australian football players	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	9	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
pubs.organisational-group	/University of Technology Sydney/Strength - CHT - Health Technologies
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	closed_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	9	en_US

Abstract:

Purpose: To examine the physiological and performance responses to a heat-acclimatization camp in highly trained professional team-sport athletes. Methods: Eighteen male Australian Rules Football players trained for 2 wk in hot ambient conditions (31-33°C, humidity 34-50%). Players performed a laboratory-based heat-response test (24-min walk + 24 min seated; 44°C), a YoYo Intermittent Recovery Level 2 Test (YoYoIR2; indoor, temperate environment, 23°C) and standardized training drills (STD; outdoor, hot environment, 32°C) at the beginning and end of the camp. Results: The heat-response test showed partial heat acclimatization (eg, a decrease in skin temperature, heart rate, and sweat sodium concentration, P <.05). In addition, plasma volume (PV, CO rebreathing, +2.68 [0.83; 4.53] mL/kg) and distance covered during both the YoYoIR2 (+311 [260; 361] m) and the STD (+45.6 [13.9; 77.4] m) increased postcamp (P <.01). None of the performance changes showed clear correlations with PV changes (r <.24), but the improvements in running STD distance in hot environment were correlated with changes in hematocrit during the heat-response test (r = -.52, 90%CI [-.77; -.12]). There was no clear correlation between the performance improvements in temperate and hot ambient conditions (r <.26). Conclusion: Running performance in both hot and temperate environments was improved after a football training camp in hot ambient conditions that stimulated heat acclimatization. However, physiological and performance responses were highly individual, and the absence of correlations between physical-performance improvements in hot and temperate environments suggests that their physiological basis might differ. © 2014 Human Kinetics, Inc.

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http://hdl.handle.net/10453/114625