title: Effect of water load in human body systems upon tolerance to +Gz acceleration.
abstract: A possible improvement of +Gz acceleration tolerance, obtained in human subjects through administering specific volumes of water, viz. 7, 14 and 21 ml/kg body weight, to be drunk immediately before centrifuge examination in order to increase the volume of plasma, thus increasing the circulating blood volume, was the starting-point for this work. Two hundred healthy male subjects, aged 19.9 +/- 0.9, were classified in 4 main groups and 2 supplementary groups for examination. It was found that the water intake in volumes of 14 ml/kg body weight produced a significant mean increase in the acceleration tolerance of 0.8 G, and that of 21 ml/kg body weight improved acceleration tolerance by 1.1 G on the average. The increase tolerance to acceleration was maintained throughout a period of about 30 minutes (for 14 ml/kg body weight) up to approximately 50 minutes (for 21 ml/kg body weight). The favourable effect of water load in the body systems upon +Gz acceleration tolerance was probably due to the increase of plasma volume (by 5.24% and 6.98% for 14 and 21 ml/kg body weight, respectively).
authors.affiliation: Military Institute of Aviation Medicine, Warsaw.
authors.forename: D
authors.initials: D
authors.lastname: Gembicka
mesh_terms: D000328:Adult; D006112:Gravitation; D006801:Humans; D008297:Male; D014867:Water / Q000494:pharmacology*; D014882:Water-Electrolyte Balance / Q000502:physiology*
chemical_list: D014867:Water