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Chronic acceleration and brain densityTests carried out on rabbits show that the effect of chronic acceleration is not uniform among the various tissues studied. Although body mass is reduced by the treatment, as expected, no change is apparent in brain mass or in the density of cerebrospinal fluid. Acceleration-induced changes are encountered in tissue density, the myocardium exhibiting a transient increase followed by an exponential decrease toward a limit and the brain showing an arithmetic increase in density with continued exposure to 2.5 G. The data are seen as suggesting that a specific brain load is not a regulated phenomenon and that no physiological processes occur to attenuate the increased load imposed by the hyperdynamic environment. An equation is derived indicating that the stimulus potential per unit of brain load increases with body size, even though brain density decreases and cerebrospinal fluid density increases.
Document ID
19820057234
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hoffman, L. F.
(California Univ. Davis, CA, United States)
Smith, A. H.
(California, University Davis, CA, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Subject Category
Life Sciences (General)
Accession Number
82A40769
Funding Number(s)
CONTRACT_GRANT: NSG-7493
Distribution Limits
Public
Copyright
Other

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