Appearance of D2O in sweat after oral and oral-intravenous rehydration in men.

摘要: Intravenous (IV) rehydration is common in athletics, but its thermoregulatory benefits and ergogenicity have not been elucidated. Availability of orally ingested fluid dependent on gastric emptying intestinal absorption rate. Deuterium oxide (D2O) has used to demonstrate that during exercise appears sweat within 10 minutes. The purpose this study was determine the effect concurrent IV D2O appearance samples after per ora with labeled fluid. We hypothesized combination method would be superior oral method. Ten fit men (age 23 ± 4, [latin capital V dot above]O2max 59.49 4.09 L·min-1) underwent 20 hours restriction resulting 1.95 0.25% body weight loss before beginning treadmill cycling. Exercise performed an environmental chamber (35.6 0.2° C, 35.0 1.8% relative humidity) for 2 at 55% above]O2max, participants exhibited a mean deficit 4.50 0.04%. Thermoregulatory measures were recorded while subjects rehydrated (OR) or combined intravenous (IVO) traced D2O. After 30 minutes seated recovery, began 55-60% above]O2max. Forehead collected 0, 5, 10, 20, 75 from start rehydration. analyzed via isotope ratio mass spectrometry. did appear rehydration; however, it subsequent bout. There no significant difference between modes. Plasma volume increases decreased significantly alter transit time ingestion excreted sweat. IVO does traditional OR