Article Text

PDF
Voluntary fluid intake and core temperature responses in adolescent tennis players: sports beverage versus water
  1. M F Bergeron,
  2. J L Waller,
  3. E L Marinik
  1. Medical College of Georgia, Augusta, GA, USA
  1. Correspondence to:
 Dr Bergeron
 Department of Physical Therapy, Medical College of Georgia, Augusta, GA 30912-0800, USA; mbergero{at}mcg.edu

Abstract

Objective: To examine differences in ad libitum fluid intake, comparing a 6% carbohydrate/electrolyte drink (CHO-E) and water, and associated differences in core temperature and other selected physiological and perceptual responses in adolescent athletes during tennis training in the heat.

Methods: Fourteen healthy, fit, young tennis players (nine male; five female; mean (SD) age 15.1 (1.4) years; weight 60.6 (8.3) kg; height 172.8 (8.6) cm) completed two 120 minute tennis specific training sessions on separate days (randomised, crossover design) in a warm environment (wet bulb globe temperature: CHO-E, 79.3 (2.6) °F; water, 79.9 (2.2) °F; p>0.05).

Results: There were no significant differences (p>0.05) between the trials with respect to fluid intake, urine volume, fluid retention, sweat loss, perceived exertion, thirst, or gastrointestinal discomfort. However, there was a difference (p<0.05) in the percentage body weight change after training (CHO-E, −0.5 (0.7)%; water, −0.9 (0.6)%). Urine specific gravity before training (CHO-E, 1.024 (0.006); water, 1.025 (0.005)) did not correlate significantly (p>0.05) with any of these measurements or with core body temperature. In examining the main effect for trial, the CHO-E trial showed a significantly lower (p<0.001) mean body temperature (irrespective of measurement time) than the water trial. However, the mean body temperature in each trial was not associated (p>0.05) with fluid intake, fluid retention, sweat loss, or percentage body weight change.

Conclusion: Ad libitum consumption of a CHO-E drink may be more effective than water in minimising fluid deficits and mean core temperature responses during tennis and other similar training in adolescent athletes.

  • tennis
  • hydration
  • hyperthermia
  • perception
  • sweating

Statistics from Altmetric.com

Footnotes

  • Competing interests: This study was supported by the Gatorade Sport Science Institute

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.