Document Detail

Infradian alteration of circadian rhythms in owl monkeys (Aotus lemurinus griseimembra): an effect of estrous?
MedLine Citation:
PMID:  8848469     Owner:  NLM     Status:  MEDLINE    
Long-term recordings of locomotor activity, feeding activity and core temperature carried out in 7 male and 7 female adult owl monkeys (Aotus lemurinus griseimembra) revealed sex-specific infradian alterations in the level of these circadian functions when the monkeys were housed under lighting conditions which neither inhibited nor enhanced (i.e., "masked,") their circadian activity rhythms. Such nonmasking lighting conditions were: constant dim light (LL) at 0.1-0.5 lx, photoperiods consisting of 0.5 h light (L) at 80 lx and 23.5 h darkness (D) at 0.5 lx, and skeleton photoperiods consisting of two 80-lux light pulses of 0.5 h applied at intervals of 12:12 h and 9:15 h, respectively. In 5 of the female and none of the male owl monkeys, the amount of locomotor activity per day or per circadian cycle, increased at an average interval of 14.0 +/- 2.3 days to 198.4 +/- 48.2%, while the feeding activity was concomitantly reduced to 53.7 +/- 11.2%, and the core temperature level dropped by 0.3 +/- 0.1 degrees C, as compared to the respective preceding level of these parameters. The period of this infradian periodicity superimposed on the circadian rhythms corresponds approximately to the ovarian cycle length of Aotus (6,7). As food deprivation for one day resulted in a drop in core temperature is probably the result of reduced food intake. The infradian rise in activity and the decrease in food intake might be an effect of the ovarian cyclic variation in estrogen level.
B Rauth-Widmann; E Fuchs; H G Erkert
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Physiology & behavior     Volume:  59     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  1996 Jan 
Date Detail:
Created Date:  1996-10-24     Completed Date:  1996-10-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  11-8     Citation Subset:  IM    
Zoologisches Institut/Tierphysiologie der Universität Tübingen, Germany.
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MeSH Terms
Body Temperature / physiology
Circadian Rhythm / physiology*
Eating / physiology
Estrus / physiology*
Food Deprivation / physiology
Motor Activity / physiology
Sex Characteristics

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