The Changes of Sweat Electrolyte Concentration of Adolescent Athletes Exercising in Hot Environment with Replacement Drinks
Zhang Shou, et al (Institute of Sports Medicine, Beijing Medical University, Beijing, China 100083)
The purpose of this study if to observe the sweat conternt and amount of 10 male adolescent volleyball players exercising in a hot environment. The chamber's temperature was kept at 29±1℃, relative humidity 84±6%. The total amount of sweat each was to 2. 16L after 1. 5hr intermittent exercise. The Na+ , K+, Mg++ content of sweat collected from back skin was 64. 37 ± 22. 1 mmol/L, 3. 97±0. 71 mmol/L, 0. 87±0. 42 mmol/L, repectively with total amount lost 81. 10 mmol, 5. 0 mmol, and 1. 10 mmol. The ratio of the amount lost to RDA (Recommended Dietary Allowances)for players is 37. 3%, 6. 5, and 6. 6% respectively. Thus it can be ignored that the body electrolytes will be lost from sweat significantly when players are training in hot environment and lose a huge amount of sweat. It was also found that the sweat content maintained relatively stable when players took the drinks of 18 mmol/L Na+ as replacement fluid.