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This Article Full Text Full Text (PDF) All Versions of this Article: 91/5/925    most recent expphysiol.2006.034223v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Mündel, T. Articles by Jones, D. A. Search for Related Content PubMed PubMed Citation Articles by Mündel, T. Articles by Jones, D. A. Related Collections Human, Environmental & Exercise

¹ Human Performance Laboratory, School of Sport and Exercise Sciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK ² Institute for Biophysical and Clinical Research into Human Movement, Manchester Metropolitan University, Hassall Road, Alsager, Cheshire ST7 2HL, UK

The effect of different drink temperatures on the perception of exertion and exercise endurance has not been extensively investigated. Consequently, the purpose of the present study was to examine the effect of drink temperature on fluid intake and endurance during cycling in the heat. Eight healthy, non-acclimated males (26 ± 7 years; maximum oxygen uptake, 54 ± 5 ml kg^–1 min^–1; mean ± S.D.) cycled to exhaustion at 34°C and at 65% of their peak aerobic power, consuming a drink at either 19°C (CON) or 4°C (COLD). Six of the eight subjects cycled for longer during COLD, with exhaustion occurring at 62 ± 4 min, compared to 55 ± 4 min for CON (P < 0.05; mean ± S.E.M.). Subjects consumed significantly more fluid during COLD compared to CON (1.3 ± 0.3 l h^–1 compared to 1.0 ± 0.2 l h^–1; P < 0.05). Heart rate tended to be lower by 5 beats min^–1 during COLD, and rectal temperature during the second half of the exercise period was 0.25°C lower during the COLD trial; however, these trends were not significant (P = 0.08 and P = 0.07, respectively). No differences were observed between trials for ventilation, concentrations of prolactin, glucose and lactate or perceived exertion. It is concluded that a drink at 4°C during exercise in the heat enhances fluid consumption and improves endurance by acting as a heat sink, attenuating the rise in body temperature and therefore reducing the effects of heat stress.

(Received 12 April 2006; accepted after revision 14 June 2006; first published online 15 June 2006)
Corresponding author T. Mündel: School of Sport and Exercise Sciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK. Email: t.mundel{at}bham.ac.uk

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