The effect of ice-slushy consumption on plasma vasoactive intestinal peptide during prolonged exercise in the heat

Catriona A Burdon; Patricia Ruell; Nathan Johnson; Phillip Chapman; Sinead O'Brien; Helen T O'Connor

doi:10.1016/j.jtherbio.2014.11.005

The effect of ice-slushy consumption on plasma vasoactive intestinal peptide during prolonged exercise in the heat

J Therm Biol. 2015 Jan:47:59-62. doi: 10.1016/j.jtherbio.2014.11.005. Epub 2014 Nov 18.

Authors

Catriona A Burdon¹, Patricia Ruell², Nathan Johnson³, Phillip Chapman⁴, Sinead O'Brien⁵, Helen T O'Connor⁶

Affiliations

¹ Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: cburdon@uow.edu.au.
² Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: patricia.ruell@sydney.edu.au.
³ Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: nathan.johnson@sydney.edu.au.
⁴ Exercise Science, Australian Catholic University, Sydney, Australia. Electronic address: phillip.chapman@acu.edu.au.
⁵ Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: obrien.s91@hotmail.com.
⁶ Exercise, Health and Performance Research Group, Faculty of Health Sciences, University of Sydney, Sydney, Australia. Electronic address: helen.oconnor@sydney.edu.au.

PMID: 25526655
DOI: 10.1016/j.jtherbio.2014.11.005

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.

Keywords: Beverage temperature; Cold drink; Endurance exercise; Thermoregulation.

MeSH terms

Adult
Beverages
Bicycling / physiology
Body Temperature Regulation*
Cold Temperature
Drinking*
Exercise / physiology*
Hot Temperature*
Humans
Ice
Male
Skin Temperature
Vasoactive Intestinal Peptide / blood*

Substances

Ice
Vasoactive Intestinal Peptide