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Author (up) Hozer, C.; Pifferi, F. url  doi
  Title Physiological and cognitive consequences of a daily 26 h photoperiod in a primate: exploring the underlying mechanisms of the circadian resonance theory Type Journal Article
  Year 2020 Publication Proceedings. Biological Sciences Abbreviated Journal Proc Biol Sci  
  Volume 287 Issue 1931 Pages 20201079  
  Keywords Animals; Body Temperature; Cheirogaleidae/*physiology; Circadian Clocks; *Circadian Rhythm; Cognition; Male; Motor Activity; Photoperiod; Vibration; *circadian clock resonance; *cognition; *physiological costs; *synchronization  
  Abstract The biological clock expresses circadian rhythms, whose endogenous period (tau) is close to 24 h. Daily resetting of the circadian clock to the 24 h natural photoperiod might induce marginal costs that would accumulate over time and forward affect fitness. It was proposed as the circadian resonance theory. For the first time, we aimed to evaluate these physiological and cognitive costs that would partially explain the mechanisms of the circadian resonance hypothesis. We evaluated the potential costs of imposing a 26 h photoperiodic regimen compared to the classical 24 h entrainment measuring several physiological and cognitive parameters (body temperature, energetic expenditure, oxidative stress, cognitive performances) in males of a non-human primate (Microcebus murinus), a nocturnal species whose endogenous period is about 23.5 h. We found significant higher resting body temperature and energy expenditure and lower cognitive performances when the photoperiodic cycle length was 26 h. Together these results suggest that a great deviation of external cycles from tau leads to daily greater energetic expenditure, and lower cognitive capacities. To our knowledge, this study is the first to highlight potential mechanisms of circadian resonance theory.  
  Address UMR CNRS MNHN 7179 MECADEV, 1 Avenue du Petit Chateau 91800 Brunoy, France  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0962-8452 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:32693726; PMCID:PMC7423648 Approved no  
  Call Number GFZ @ kyba @ Serial 3243  
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