Physiological and Performance Responses to a Training Camp in the Heat in Professional Australian Football Players

Racinais, S; Buchheit, M; Bilsborough, JC; Gaoua, N; Voss, S; Christian, R; Coutts, AJ

Physiological and Performance Responses to a Training Camp in the Heat in Professional Australian Football Players

Racinais, S Buchheit, M Bilsborough, JC Gaoua, N Voss, S Christian, R Coutts, AJ

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

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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, JC	en_US
dc.contributor.author	Gaoua, N	en_US
dc.contributor.author	Voss, S	en_US
dc.contributor.author	Christian, R	en_US
dc.contributor.author	Coutts, AJ	en_US
dc.date.issued	2014-01	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/10453/41975
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 (3133°C, humidity 3450%). 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.	en_US
dc.publisher	Human Kinetics	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.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 Science	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/Strength - CHSP - Health Services and Practice
pubs.organisational-group	/University of Technology Sydney/Strength - CHT - Health Technologies
utslib.copyright.status	closed_access
pubs.consider-herdc	true	en_US
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 (3133°C, humidity 3450%). 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.

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http://hdl.handle.net/10453/41975