TENNIS AND HEALTH

Core body temperature during competition in the heat: national boys’ 14s junior tennis championships

Michael F Bergeron¹, Kathryn S McLeod², John F Coyle³

¹ Environmental Physiology Laboratory, Medical College of Georgia, Augusta, Georgia, USA
² Department of Pediatrics, Medical College of Georgia, Augusta, Georgia, USA
³ Heart Center of Tulsa, Tulsa, Oklahoma, USA

Michael F Bergeron, FACSM, Medical College of Georgia, Department of Physical Therapy, EC-1340, Augusta, GA 30912, USA; mbergero{at}mcg.edu

Objective: To examine on-court core body temperature (T_C) and sweat loss, as well as pre- and post-play hydration status, in elite adolescent tennis players during a national championships event in a hot climate.

Methods: Eight healthy, fit, young male tennis players (mean (SD) age 13.9 (0.9) years; mass 56.0 (10.7) kg; height 169.2 (14.7) cm) were evaluated during first-round singles competition at the National Boys’ 14s Junior Championships in the heat (wet-bulb globe temperature (WBGT) 29.6 (0.4) °C). Five of those same players were also evaluated during a same-day doubles match (WBGT 31.3 (0.5) °C).

Results: During doubles (4.37 (0.35) h after singles), pre-play urine specific gravity (USG) (1.025 (0.002); p = 0.06) and total sweat loss (1.9 (0.2) litres; p = 0.10) tended to be higher before and during doubles, respectively, compared to singles. However, percentage change in body mass (–0.5 (0.3) %) tended to be comparatively less (p = 0.08), even though the doubles matches were generally longer (106.6 (11.2) vs 78.8 (10.9) min; p = 0.09) and the degree minutes total was greater (p = 0.04). T_C increased (p<0.001) during singles and remained elevated, even after 10 min following the end of play. Notably, pre-play (singles) USG was strongly associated (p = 0.005) with the players’ final T_C (38.7 (0.3) °C) recorded at the end of singles play.

Conclusion: Junior tennis players who begin a match not well hydrated could have progressively increasing thermal strain and a greater risk for exertional heat illness as the match advances.

Abbreviations: ANOVA, analysis of variance; USG, urine specific gravity; WBGT, wet-bulb globe temperature

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