Please use this identifier to cite or link to this item: https://doi.org/10.4085/1062-6050-46.6.592
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dc.titleSelf-paced exercise performance in the heat after pre-exercise cold-fluid ingestion
dc.contributor.authorByrne C.
dc.contributor.authorOwen C.
dc.contributor.authorCosnefroy A.
dc.contributor.authorLee J.K.W.
dc.date.accessioned2020-10-16T06:39:14Z
dc.date.available2020-10-16T06:39:14Z
dc.date.issued2011
dc.identifier.citationByrne C., Owen C., Cosnefroy A., Lee J.K.W. (2011). Self-paced exercise performance in the heat after pre-exercise cold-fluid ingestion. Journal of Athletic Training 46 (6) : 592 - 599. ScholarBank@NUS Repository. https://doi.org/10.4085/1062-6050-46.6.592
dc.identifier.issn10626050
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/177618
dc.description.abstractContext: Precooling is the pre-exercise reduction of body temperature and is an effective method of improving physiologic function and exercise performance in environmental heat. A practical and effective method of precooling suitable for application at athletic venues has not been demonstrated. Objective: To confirm the effectiveness of pre-exercise ingestion of cold fluid without fluid ingestion during exercise on pre-exercise core temperature and to determine whether pre-exercise ingestion of cold fluid alone without continued provision of cold fluid during exercise can improve exercise performance in the heat. Design: Randomized controlled clinical trial. Setting: Environmental chamber at an exercise physiology laboratory that was maintained at 32°C, 60% relative humidity, and 3.2 m/s facing air velocity. Patients or Other Participants: Seven male recreational cyclists (age = 21 ±1.5 years, height = 1.81 ±0.07 m, mass = 78.4 ±9.2 kg) participated. Intervention(s): Participants ingested 900 mL of cold (2°C) or control (37°C) flavored water in 3 300-mL aliquots over 35 minutes of pre-exercise rest. Main Outcome Measure(s): Rectal temperature and thermal comfort before exercise and distance cycled, power output, pacing, rectal temperature, mean skin temperature, heart rate, blood lactate, thermal comfort, perceived exertion, and sweat loss during exercise. Results: During rest, a greater decrease in rectal temperature was observed with ingestion of the cold fluid (0.41 ±0.16°C) than the control fluid (0.17 ±0.17°C) over 35 to 5 minutes before exercise (t6 = -3.47, P = .01). During exercise, rectal temperature was lower after ingestion of the cold fluid at 5 to 25 minutes (t6 range, 2.53-3.38, P ? .05). Distance cycled was greater after ingestion of the cold fluid (19.26 ±2.91 km) than after ingestion of the control fluid (18.72 ±2.59 km; t6 = -2.80, P = .03). Mean power output also was greater after ingestion of the cold fluid (275 ±27 W) than the control fluid (261 ±22 W; t6 = -2.13, P = .05). No differences were observed for pacing, mean skin temperature, heart rate, blood lactate, thermal comfort, perceived exertion, and sweat loss (P > .05). Conclusions: We demonstrated that pre-exercise ingestion of cold fluid is a simple, effective precooling method suitable for field-based application. © by the National Athletic Trainers' Association.
dc.publisherNational Athletic Trainers' Association Inc.
dc.sourceScopus
dc.subjectHyperthermia
dc.subjectPrecooling
dc.subjectTime trial
dc.typeArticle
dc.contributor.departmentPHYSIOLOGY
dc.description.doi10.4085/1062-6050-46.6.592
dc.description.sourcetitleJournal of Athletic Training
dc.description.volume46
dc.description.issue6
dc.description.page592 - 599
dc.description.codenJATTE
dc.published.statePublished
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