Document Detail

The effect of various photoperiods on daily oscillations of serum corticosterone and insulin in rats.
MedLine Citation:
PMID:  1286099     Owner:  NLM     Status:  MEDLINE    
The effect of various photoperiods on circadian rhythms of chosen parameters was investigated in laboratory rats. SPF male Wistar rats were adapted for six weeks to artificial light-dark cycles (LD 8:16, 12:12, 16:8). The light was switched on at 07.00 h in all regimens. The rats were killed at 3-hour intervals within 24 h, the serum concentration of corticosterone, insulin, glucose, food and water intake was determined. The external and computative acrophases of corticosterone varied in every photoperiod being dependent on the duration of light, the mesor values decreased in LD 16:8 in comparison with other photoperiods. The external acrophase of insulin was located 4 h after light onset in LD 8:16 and 12:12, in LD 16:8 one hour before light onset. The mesor values were approximately equal in all photoperiods. The circadian rhythms of glucose were similar in all regimens. Circadian variation of food and water consumption culminated at the same time in all regimens, the amount of food consumed in light increased with the light duration. Various photoperiods remarkably influenced circadian oscillations of corticosterone and in part food and water intake which could be considered as photoperiodic traits.
E Ahlersová; I Ahlers; B Smajda; M Kassayová
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Physiological research / Academia Scientiarum Bohemoslovaca     Volume:  41     ISSN:  0862-8408     ISO Abbreviation:  Physiol Res     Publication Date:  1992  
Date Detail:
Created Date:  1993-03-12     Completed Date:  1993-03-12     Revised Date:  2008-04-02    
Medline Journal Info:
Nlm Unique ID:  9112413     Medline TA:  Physiol Res     Country:  CZECHOSLOVAKIA    
Other Details:
Languages:  eng     Pagination:  315-21     Citation Subset:  IM    
Institute of Animal Physiology, Faculty of Science, Safárik University, Kosice, Czechoslovakia.
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MeSH Terms
Blood Glucose / analysis
Circadian Rhythm*
Corticosterone / blood*
Insulin / blood*
Rats, Wistar
Reg. No./Substance:
0/Blood Glucose; 11061-68-0/Insulin; 50-22-6/Corticosterone

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