From a sealed chamber like the cabin of a rocket ship, and from space-helmeted human guinea pigs who live in it, medical researchers at the National Institutes of Health at Bethesda, Md. hope to learn answers to some fundamental questions about the body's consumption of fuel and oxygen. So far, only fragmentary data, e.g., resting (basal) and a few other metabolic rates, have been recorded. But N.I.H. scientists expect to find out how much oxygen a man uses and how many calories he burns in walking a mile, solving a brain-twisting problem or...
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