![]() Because fat mass is less dense than water, a person with more body fat weighs less in the water, and you can use this principle to determine how much of a person is fat-free mass, and how much of them is fat. It involves completely submerging yourself in a tank filled with tap-cold water. It was my turn to play test subject for hydrostatic weighing, which was once the gold standard measure of body fat percentage. ![]() It was data collection day in my undergraduate Exercise Physiology Lab at the University of Miami, and we were contrasting the accuracy of various body composition assessment tools to complement our studies on the effectiveness of lifestyle interventions. I was in a matching black Nike Pro spandex bra and shorts set with 12 pairs of strange eyes fixated on my body, which was floating in a glass tank, and somehow I was hot and clammy despite being underwater. ![]() T he one time I cried in public I was 20 years old.
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