Environmental temperature as a mediator on the association between photoperiod at birth and chronotype.

Environmental temperature as a mediator on the association between photoperiod at birth and chronotype. Chronobiol Int. 2020 Jun 23;:1-7 Authors: Santos RC, Silva ACPE, Santos MJD, Barbosa MR, Coimbra DG, Gitaí DLG, de Andrade TG Abstract The association between chronotypes and season of birth (SOB) remains an inconclusive issue due, in some extension, to the lack of investigations of mediation mechanisms. We evaluated the association of photoperiod at birth (PAB) with chronotypes and sleep duration in Brazil (n = 810), and the mediating effect of meteorological factors, sex, age and rs4753426 polymorphism in the melatonin receptor MTNR1B. Longer PAB was associated with a delayed mid-sleep phase with a suppressive effect of maximum environmental temperature. No significant interactions were identified for the other variables. These findings suggest that photoperiod and environmental temperature modulate chronotype development at early stages. PMID: 32573265 [PubMed - as supplied by publisher]
Source: Chronobiology International - Category: Biology Authors: Tags: Chronobiol Int Source Type: research