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WeightlessnessSignificance of gravitation forces in regulating homeostasis is discussed, along with weightlessness effects on humans and a state of reduced weight (subgravity), such as on the moon. Biomedical effects of weightlessness adaptation to zero G and readaptation to terrestrial gravitation are described for the nervous system, cardiovascular system, metabolism, and musculoskeletal system. Reactions caused primarly by: (1) changes in the afferent nervous system, (2) lack of hydrostatic blood pressure, (3) lack of weight on the musculoskeletal system, and (4) exposure limits derived from the effects of prolonged weightlessness on humans are reviewed. Protection of humans from adverse effects of weightlessness is considered; Skylab missions are also summarized.
Document ID
19760019729
Acquisition Source
Headquarters
Document Type
Book Chapter
Authors
I. D. Pestov
(Central Clinical Hospital of Civil Aviation Moscow, Russia)
Siegfried J. Gerathewohl
(Federal Aviation Administration Washington D.C., District of Columbia, United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Publication Information
Publication: Foundations of Space Biology and Medicine: Ecological and Physiological Bases of Space Biology and Medicine
Publisher: National Aeronautics and Space Administration / Academy of Sciences of the USSR
Volume: 2
Issue: Book 1
Issue Publication Date: January 1, 1975
ISBN: 1410220532
URL: https://ntrs.nasa.gov/citations/19760019721
Subject Category
Aerospace Medicine
Accession Number
76N26817
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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