Circaseptan rhythm of corticosterone and lipids in the serum of male rats.
After adaptation to standard conditions and to a 12:12 h light: dark regimen, groups of young SPF male Wistar rats were killed at 8 h on 17 consecutive days and their serum corticosterone and lipid concentrations were determined. Using a combination of a Fourier harmonic analysis and an analysis of variance, the circaseptan rhythm of corticosterone, total cholesterol and triacylglycerol oscillations was determined; it is unlikely that the nonesterified fatty acid concentration has a 7-day rhythm. The circaseptan variation of metabolic and hormonal indicators is evidently adaptive in character and its existence ought to be taken particularly into account in the evaluation of long-term experiments.
Ahlers
I
I
Department of General Biology, Faculty of Science, Safárik University, Kosice.
Ahlersová
E
E
Smajda
B
B
Toropila
M
M
Datelinka
I
I
D000818:Animals; D002784:Cholesterol / Q000097:blood; D003345:Corticosterone / Q000097:blood*; D005230:Fatty Acids, Nonesterified / Q000097:blood; D008055:Lipids / Q000097:blood*; D008297:Male; D010507:Periodicity; D051381:Rats; D011919:Rats, Inbred Strains; D014280:Triglycerides / Q000097:blood
D005230:Fatty Acids, Nonesterified; D008055:Lipids; D014280:Triglycerides; D002784:Cholesterol; D003345:Corticosterone