Hydration, sweat and thermoregulatory responses to professional football training in the heat

Duffield, R; McCall, A; Coutts, AJ; Peiffer, JJ

Hydration, sweat and thermoregulatory responses to professional football training in the heat

Duffield, R

McCall, A Coutts, AJ

Peiffer, JJ

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Publication Type:: Journal Article
Citation:: Journal of Sports Sciences, 2012, 30 (10), pp. 957 - 965
Issue Date:: 2012-06-01

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Field	Value	Language
dc.contributor.author	Duffield, R https://orcid.org/0000-0002-5641-1314	en_US
dc.contributor.author	McCall, A	en_US
dc.contributor.author	Coutts, AJ https://orcid.org/0000-0002-1782-7691	en_US
dc.contributor.author	Peiffer, JJ	en_US
dc.date.issued	2012-06-01	en_US
dc.identifier.citation	Journal of Sports Sciences, 2012, 30 (10), pp. 957 - 965	en_US
dc.identifier.issn	0264-0414	en_US
dc.identifier.uri	http://hdl.handle.net/10453/18455
dc.description.abstract	This study examined the relationship between intensity of training and changes in hydration status, core temperature, sweat rate and composition and fluid balance in professional football players training in the heat. Thirteen professional football players completed three training sessions; "higher-intensity" (140 min; HI 140), "lower-intensity" (120 min; LI 120) and "game-simulation" (100 min; GS 100). Movement demands were measured by Global Positioning System, sweat rate and concentration were determined from dermal patches and body mass change. Despite similar environmental conditions (26.9 ± 0.1°C and 65.0 ± 7.0% relative humidity [Rh]), higher relative speeds (m · min -1) and increased perceptions of effort and thermal strain were observed in HI 140 and GS 100 compared with LI 120 (P < 0.05). Significantly (P < 0.05) greater sweat rate (L · h -1) and electrolyte losses (g) were observed in HI 140 and GS 100 compared with LI 120. Rate of rise in core temperature was correlated with mean speed (r = 0.85), session rating of perceived exertion (sRPE) (r = 0.61), loss of potassium (K +) (r = 0.51) sweat rate (r = 0.49), and total sweat loss (r = 0.53), with mean speed the strongest predictor. Sodium (Na +) (r = 0.39) and K + (r = 0.50) losses were associated with total distance covered. In hot conditions, individualised rehydration practices should be adopted following football training to account for differences in sweat rate and electrolyte losses in response to intensity and overall activity within a session. © 2012 Copyright Taylor and Francis Group, LLC.	en_US
dc.relation.ispartof	Journal of Sports Sciences	en_US
dc.relation.isbasedon	10.1080/02640414.2012.689432	en_US
dc.subject.classification	Sport Sciences	en_US
dc.subject.mesh	Sweat	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Dehydration	en_US
dc.subject.mesh	Fluid Therapy	en_US
dc.subject.mesh	Water-Electrolyte Balance	en_US
dc.subject.mesh	Body Temperature Regulation	en_US
dc.subject.mesh	Sweating	en_US
dc.subject.mesh	Soccer	en_US
dc.subject.mesh	Adolescent	en_US
dc.subject.mesh	Adult	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Hot Temperature	en_US
dc.subject.mesh	Young Adult	en_US
dc.title	Hydration, sweat and thermoregulatory responses to professional football training in the heat	en_US
dc.type	Journal Article
utslib.citation.volume	10	en_US
utslib.citation.volume	30	en_US
utslib.for	1106 Human Movement and Sports Sciences	en_US
utslib.for	1302 Curriculum and Pedagogy	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	closed_access
pubs.issue	10	en_US
pubs.publication-status	Published	en_US
pubs.volume	30	en_US

Abstract:

This study examined the relationship between intensity of training and changes in hydration status, core temperature, sweat rate and composition and fluid balance in professional football players training in the heat. Thirteen professional football players completed three training sessions; "higher-intensity" (140 min; HI 140), "lower-intensity" (120 min; LI 120) and "game-simulation" (100 min; GS 100). Movement demands were measured by Global Positioning System, sweat rate and concentration were determined from dermal patches and body mass change. Despite similar environmental conditions (26.9 ± 0.1°C and 65.0 ± 7.0% relative humidity [Rh]), higher relative speeds (m · min -1) and increased perceptions of effort and thermal strain were observed in HI 140 and GS 100 compared with LI 120 (P < 0.05). Significantly (P < 0.05) greater sweat rate (L · h -1) and electrolyte losses (g) were observed in HI 140 and GS 100 compared with LI 120. Rate of rise in core temperature was correlated with mean speed (r = 0.85), session rating of perceived exertion (sRPE) (r = 0.61), loss of potassium (K +) (r = 0.51) sweat rate (r = 0.49), and total sweat loss (r = 0.53), with mean speed the strongest predictor. Sodium (Na +) (r = 0.39) and K + (r = 0.50) losses were associated with total distance covered. In hot conditions, individualised rehydration practices should be adopted following football training to account for differences in sweat rate and electrolyte losses in response to intensity and overall activity within a session. © 2012 Copyright Taylor and Francis Group, LLC.

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http://hdl.handle.net/10453/18455