NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Effect of sleep-wake reversal and sleep deprivation on the circadian rhythm of oxygen toxicity seizure susceptibility.Albino Sprague-Dawley rats were exposed in a previously O2 flushed, CO2 free chamber. The exposure began with attainment of 60 psi (gauge) and the end point was the first generalized oxygen toxicity seizure. Animals were exposed to reversal diurnal conditions since weanlings until their sleep-wake cycles had completely reversed, and then divided into four groups of 20 based on the time of day exposed. The time of exposure to oxygen at high pressure prior to seizure was now significantly longer in the group exposed from 1900 to 2000 hr and a reversal of the circadian rhythm of oxygen toxicity seizure susceptibility was noted. Animals maintained on normal diurnal conditions were deprived of sleep on the day of exposure for the 12 hours prior to exposure at 1900 hr, while controls were allowed to sleep. There was no significant differences in the time prior to seizure between the deprived animals and the controls with an n = 40. Thus the inherent threshold in susceptibility to high-pressure oxygen seizures seems not to be a function of sleep itself, but of some biochemical/physiologic event which manifests a circadian rhythm.
Document ID
19730027759
Document Type
Reprint (Version printed in journal)
Authors
Dexter, J. D.
Hof, D. G.
Mengel, C. E. (Missouri, University Columbia, Mo., United States)
Date Acquired
August 7, 2013
Publication Date
October 1, 1972
Publication Information
Publication: Aerospace Medicine
Volume: 43
Subject Category
BIOSCIENCES
Funding Number(s)
CONTRACT_GRANT: NIH-CA-11447-04
CONTRACT_GRANT: N00014-67-0003
CONTRACT_GRANT: NAS9-9209
Distribution Limits
Public
Copyright
Other