The effect of various photoperiods on daily oscillations of serum corticosterone and insulin in rats

Title:

The effect of various photoperiods on daily oscillations of serum corticosterone and insulin in rats

Creator:

Ahlersová, E., Ahlers, I., Šmajda, B., and Kassayová, M.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:de03a18b-a2a3-4416-814a-97f62ff6f7ff
uuid:de03a18b-a2a3-4416-814a-97f62ff6f7ff

Subject:

serum corticosterone, insulin and food intake, circadian oscillations, photoperiods, and rats

Type:

article, model:article, and TEXT

Description:

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.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 1992 Volume:41 | Number:4

Harvested from:

CDK

Metadata only:

false