title: The effect of ice-slushy consumption on plasma vasoactive intestinal peptide during prolonged exercise in the heat.
abstract: The aim of this study was to determine the effect of exercise in the heat on thermoregulatory responses and plasma vasoactive intestinal peptide concentration (VIP) and whether it is modulated by ice-slushy consumption. Ten male participants cycled at 62% V̇O2max for 90min in 32°C and 40% relative humidity. A thermoneutral (37°C) or ice-slushy (-1°C) sports drink was given at 3.5mlkg(-1) body mass every 15min during exercise. VIP and rectal temperature increased during exercise (mean±standard deviation: 4.6±4.4pmolL(-1), P=0.005; and 1.3±0.4°C, P<0.001 respectively) and were moderately associated (r=0.35, P=0.008). While rectal temperature and VIP were not different between trials, ice-slushy significantly reduced heat storage (P=0.010) and skin temperature (time×trial interaction P=0.038). It appears that VIP does not provide the signal linking cold beverage ingestion and lower skin temperature in the heat.
authors.affiliation: Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: cburdon@uow.edu.au.
authors.forename: Catriona A
authors.initials: CA
authors.lastname: Burdon
authors.affiliation: Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: patricia.ruell@sydney.edu.au.
authors.forename: Patricia
authors.initials: P
authors.lastname: Ruell
authors.affiliation: Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: nathan.johnson@sydney.edu.au.
authors.forename: Nathan
authors.initials: N
authors.lastname: Johnson
authors.affiliation: Exercise Science, Australian Catholic University, Sydney, Australia. Electronic address: phillip.chapman@acu.edu.au.
authors.forename: Phillip
authors.initials: P
authors.lastname: Chapman
authors.affiliation: Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: obrien.s91@hotmail.com.
authors.forename: Sinead
authors.initials: S
authors.lastname: O'Brien
authors.affiliation: Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: helen.oconnor@sydney.edu.au.
authors.forename: Helen T
authors.initials: HT
authors.lastname: O'Connor
mesh_terms: D000328:Adult; D001628:Beverages; D001642:Bicycling / Q000502:physiology; D001833:Body Temperature Regulation; D003080:Cold Temperature; D004326:Drinking; D015444:Exercise / Q000502:physiology*; D006358:Hot Temperature; D006801:Humans; D007053:Ice; D008297:Male; D012881:Skin Temperature; D014660:Vasoactive Intestinal Peptide / Q000097:blood*
chemical_list: D007053:Ice; D014660:Vasoactive Intestinal Peptide
keywords: Beverage temperature; Cold drink; Endurance exercise; Thermoregulation