Comparison of Body Water Turnover in Endurance Runners and Age-matched Sedentary Men

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This study compared the body water turnover in endurance athletes and age-matched sedentary men. Eight competitive endurance athletes (20.8±1.9yr) and age-matched eight sedentary men (21.6±2.5yr) participated in this study. Total body water and body water turnover were measured using the deuterium (D_2O) dilution technique. Urine samples were obtained every day for 10 days after oral administration of D_2O. The day-by-day concentrations were used to calculate the biological half-life of D_2O and body water turnover. Maximal oxygen uptake (VO_<2max>) and oxygen uptake corresponding to ventilatory threshold (VO_<2VT>) as an index of aerobic capacity were determined during a graded exercise test. Both VO_<2max> and VO_<2VT> were higher in the exercise group than in the sedentary group (P<0.05). The biological half-life of D_2O was significantly shorter in the exercise group than in the sedentary group (5.89±0.81 days vs. 7.52±0.77 days, P<0.05), and the percentage of the body water turnover was significantly higher in the exercise group than in the sedentary group (11.99±1.96% vs. 9.39±1.21%, P<0.05). The body water turnover was correlated with VO_<2max> and VO_<2VT>, respectively (P<0.05). Based on these findings, this study speculates that a level of physical activity may induce a body water turnover higher in the healthy state, since the better trained subjects have a higher body water turnover.
日本生理人類学会の論文