Effects of three different water temperatures on dehydration in competitive swimmers

Giovanni Boscaino, Felicia Farina, Valentina Di Felice, Giuseppe Morici, Filippo Macaluso, Bonsignore, Stampone

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

AimsThe purpose of this study was to evaluate the effects of three different water temperatures on physiological responses (dehydration, sweat rate, urine output, rectal temperature and plasma electrolytes) of competitive athletes during a “simulated” race of 5 km in an indoor swimming pool.MethodsNine male competitive master swimmers swam 5 km with the water at temperatures of 23, 27 and 32 ̊C. Immediately before (Pre) and after (Post) each trial, samples of blood and urine were collected, body weight was recorded and rectal temperature was measured. The dehydration percentage and sweat rate were the highest at 32 ̊C and the lowest at 23 ̊C (23 ̊C: −0.9 ± 0.5; 27 ̊C: −1.3 ± 0.6; 32 ̊C: −2.2 ± 0.7% and 23 ̊C: 0.48 ± 0.28; 27 ̊C: 0.76 ± 0.36; 32 ̊C: 1.25 ± 0.37 l/h). The Post urine volume output was not significantly different in the three trials (23 ̊C: 122.6 ± 62.4; 27 ̊C: 78.2 ± 24.9; 32 ̊C 81.4 ± 37.0 mL). The 27 and 32 ̊C water increased the rectal temperature (Pre: 37.0 ± 0.3; Post: 37.9 ± 0.5 ̊C–Pre: 36.9 ± 0.4; Post: 38.0 ± 0.4 ̊C, respectively).ResultsThis study shows that dehydration, sweat rate and body temperatures simultaneously increase with the rise of water temperature during the shortest open water swimming event distance (5 km) performed at race intensity.
Original languageEnglish
Pages (from-to)265-271
Number of pages7
JournalSCIENCE & SPORTS
Volume26
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine

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