Girls

t Density measured by Houtkooper et al (10). 1:Density measured by Cordain et al (6). proved by the University of the Witwatersrand’s Committee for Research on Human Subjects. Body density was estimated from body volume calculated from underwater weight, corrected for RV of the lungs, and gas-trointestinal aim. Subjects were seated in a metal frame and were lowered into preheated water (±37 #{176}C).When they were in the water up to their shoulders they were given a snorkel and asked to accustom themselves with breathing underwater with the snom-kel. When the subjects were completely comfortable with this they were instructed to breathe normally underwater for five breaths and then exhale forcefully, hold that position for 3-4 s, and then continue breathing normally again. Up to 10 estimations of underwater weight, which were within 100 g of each other