Abstract
Twenty (12 male and 8 female) tennis players from two Division I university tennis teams performed three days of round-robin tournament play (i.e., two singles tennis matches followed by one doubles match per day) in a hot environment (32.2 ± 1.5°C and 53.9 ± 2.4% rh at 1200 hr), so that fluid-electrolyte balance could be evaluated. During singles play, body weight percentage changes were minimal and were similar for males and females (males -1.3 ± 0.8%, females -0.7 ± 0.8%). Estimated daily losses (mmol · day-1) of sweat sodium (Na+) and potassium (K+) (males, Na+ 158.7, K+ 31.3: females, Na+ 86.5, K+ 18.9) were met by the players' daily dietary intakes (mmol · day-1) of these electrolytes (males, Na+ 279.1 ± 109.4, K+ 173.5 ± 57.7; females, Na+ 178.9 ± 68.9, K+ 116.1 ± 37.5). Daily plasma volume and electrolyte (Na+, K+) levels were genera1ly conserved, although, plasma [Na+] was lower (p < .05) on the morning of Day 4. This study indicated that these athletes generally maintained overall fluid-electrolyte balance, in response to playing multiple tennis matches on 3 successive days in a hot environment, without the occurrence of heat illness.
Original language | English (US) |
---|---|
Pages (from-to) | 180-193 |
Number of pages | 14 |
Journal | International Journal of Sport Nutrition |
Volume | 5 |
Issue number | 3 |
DOIs | |
State | Published - Jan 1 1995 |
Externally published | Yes |
Keywords
- aldosterone
- heat
- plasma osmolality
- potassium
- sodium
- sweat
- urine specific gravity
ASJC Scopus subject areas
- Food Science
- Endocrinology
- Medicine (miscellaneous)
- Public Health, Environmental and Occupational Health