Electroencephalogram activity in the anoxic turtle brain

被引:37
作者
Fernandes, JA
Lutz, PL
Tannenbaum, A
Todorov, AT
Liebovitch, L
Vertes, R
机构
[1] FLORIDA ATLANTIC UNIV, DEPT BIOL SCI, BOCA RATON, FL 33431 USA
[2] FLORIDA ATLANTIC UNIV, CTR COMPLEX SYST, BOCA RATON, FL 33431 USA
关键词
metabolic depression; isoelectric; hibernation;
D O I
10.1152/ajpregu.1997.273.3.R911
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
The anoxia-tolerant turtle brain slowly undergoes a complex sequence of changes in electroencephalogram (EEG) activity as the brain systematically downregulates its energy demands. Following N-2 respiration, the root mean square voltage rapidly fell, reaching similar to 20% of normoxic levels after similar to 100 min of anoxia. During the first 20- to 40-min transition period, the power of the EEG decreased substantially, particularly in the 12- to 24-Hz band, with low-amplitude slow wave activity predominating (3-12 Hz). Bursts of high voltage rhythmic slow (similar to 3-8 Hz) waves were seen during the 20- to 100-min period of anoxia, accompanied by large sharp waves. During the next 400 min of N-2 respiration, two distinct patterns of electrical activity characterized the anoxic turtle brain: 1) a sustained but depressed activity level, with an EEG amplitude similar to 20% of the normoxic control and with total EEG power reduced by one order of magnitude at all frequencies, and 2) short (3-15 s) periodic (0.5-2/min) bursts of mixed-frequency activity that interrupted the depressed activity state. We speculate that the EEG patterns seen during sustained anoxia represent the minimal or basic electrical activities that are compatible with the survival of the anoxic turtle brain as an integrated unit, which allow the brain to return to normal functioning when air respiration resumed.
引用
收藏
页码:R911 / R919
页数:9
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