MAXIMAL OXYGEN CONSUMPTION AND THE FUNCTIONAL STATE OF THE CIRCULATORY SYSTEM FOLLOWING SIMULATED WEIGHTLESSNESS,
Abstract
The effects of simulated weightlessness on oxygen consumption and the functional state of the cardiovascular system were studied in four healthy male subjects aged 22-25 yrs. Weightlessness was simulated by 20 days of rigorous bed rest (the horizontal position of the body during bed rest creating a hydrostatic pressure distribution similar to that produced by the absence of gravity). Motor activity was kept to a minimum; the subjects were aided in feeding and toilet functions by nursing personnel, and passed the time in reading, chatting, and watching TV. Before and after bed rest the subjects underwent progressive physical-loading tests consisting of work of increasing difficulty on a veloergometer. Endurance limits were considered reached when the subjects were unable to continue and when O2 consumption and pulse rates reached high levels. The amount of work performed during the test, O2 consumption and CO2 excretion, phonocardiograms, carotid sphygmograms, and EKGs were recorded. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 29, 1968
- Accession Number
- AD0679504
Entities
People
- B. S. Katkovskii
- L. I. Kakurin
- V. S. Georgievskii
- Yu. A. Senkevich
Organizations
- National Air and Space Intelligence Center