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Science 3 February 1967:
Vol. 155. no. 3762, pp. 558 - 560
DOI: 10.1126/science.155.3762.558
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Articles

Weight Loss in Men in Space

Paul Webb 1

1 Webb Associates, Yellow Springs, Ohio

Men returning from orbital flights have lost from 2 to 6 percent of their body weights. Similar losses occur during simulated weightlessness; blood normally pooled in dependent parts returns to the circulation, increasing central blood volume and causing excretion of water which is not replaced during flight.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)