Fluid Intake During Wheelchair Exercise in the Heat: Effects of Localized Cooling Garments
in International Journal of Sports Physiology and PerformanceClick name to view affiliation
Background:
Wheelchair tennis players, competing in hot and humid environments, are faced with an increased risk of heat-related illness and impaired performance. This study examined the effects of head and neck cooling garments on perceptions of exertion (RPE), thermal sensation (TS), and water consumption during wheelchair exercise at 30.4 ± 0.6°C.
Methods:
Eight highly trained wheelchair tennis players (1 amputee and 7 spinal cord injured) completed two 60-min, intermittent sprint trials; once with cooling (COOL) and once without cooling (CON) in a balanced cross-over design. Players could drink water ad libitum at five predetermined intervals during each trial. Heart rate, blood lactate concentration, peak speed, TS, and RPE were recorded during the trials. Body mass and water consumption were measured before and after each trial.
Results:
Water consumption was lower in COOL compared with CON (700 ± 393 mL vs. 1198 ± 675 mL respectively; P = 0.042). Trends in data suggested lower RPE and TS under COOL conditions (N.S.). Total sweat losses ranged from 200 to 1300 mL; this equated to ~1% dehydration after water consumption had been accounted for when averaged across all trials. The ad libitum drinking volumes matched and, in some cases, were greater than the total sweat losses.
Conclusions:
These results suggest that there is a counterproductive effect of head and neck cooling garments on water consumption. However, despite consuming volumes of water at least equivalent to total sweat loss, changes in body mass suggest an incidence of mild dehydration during wheelchair tennis in the heat.
Goosey-Tolfrey was with the Research Institute for Health and Social Change, Department of Exercise & Sport Science, Manchester Metropolitan University, Alsager, England, U.K., and British Paralympic Performance Services, London, U.K.; Diaper is with British Paralympic Performance Services, London, U.K., and the English Institute of Sport, Loughborough Performance Centre, Loughborough University, Leicestershire, England, U.K.; Crosland is with British Paralympic Performance Services, London, U.K.; and Tolfrey was with the Research Institute for Health and Social Change, Department of Exercise & Sport Science, Manchester Metropolitan University, Alsager, England, U.K. Currently, Goosey-Tolfrey and Tolfrey are with the School of Sport and Exercise Sciences, Loughborough University, Loughborough, U.K.
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