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• W1998052011 abstract "In this paper the response of cerebral phosphate metabolism to mild hypoxia in young, medium and old rats has been studied via in-vivo [31P]nuclear magnetic resonance (NMR). It was found that the young adults (5–6 months) were more sensitive to this mild stress than either the mature adult (11–12 months) or senescent (23–24 months) rats even though the depth of hypoxia (paO2 = 45–55mm Hg) was equal for all age groups. They displayed an earlier onset of acidosis, a greater fall in PCr and larger rise in Pi. This response is presumably an attempt to maintain adequate adenosine triphosphate (ATP) levels via anaerobic glycolysis. In contrast, mature adults and senescent adults appear to be able to maintain ATP levels by increasing mitochondrial rates. Acidosis is less severe as are drops in PCr and rises in Pi. Recovery is less complete for the young rats: Pi levels remain high while PCr and pHi levels stay low after normoxia has been reinstigated. All metabolite levels in the mature and senescent adults return to within 10% of control levels. All the data were analyzed and differences were found to be statistically significant. This study reveals that, contrary to popular belief, mature and old rats respond more favorably to reduced O2 than younger individuals. This is due to a more severe anaerobic acidosis in the latter age group. Speculations to explain this disparity are based on the fact that previous in-vitro studies involve systems that are totally or partially disconnected from the organism will not account for important feedback control present in an in-vivo system as studied here." @default.
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• W1998052011 date "1989-03-01" @default.
• W1998052011 modified "2023-09-27" @default.
• W1998052011 title "In vivo [31P]NMR studies on the influence of age on rat brain hypoxia" @default.
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• W1998052011 doi "https://doi.org/10.1016/0006-8993(89)90536-2" @default.
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