Photoperiodic stability and distribution of chronotypes in young residents of the North with different organization of activities

AIM: To assess individual subjective chronotypic properties in residents of Khanty-Mansiysk under the influence such biotropic and social stress factors as regular daytime aperiodically presented shift nighttime employment.
 MATERIALS AND METHODS: This study involved students (100 girls 53 boys) Khanty-Mansi Autonomous Okrug Yugra with a daily load employees Ambulance station (31 women 26 men) Khanty-Mansiysk, working shifts. The photoperiodic chronotype stability was studied using computer program Photoperiodic calculator (registration no. 2019661664) form mobile application for Android index.
 RESULTS: was: employment 3.5 (1.56.0) arb. units, work 1.0 (04.0) units. men 3.0 (1.04.0) 1.5 (03.0) units.
 Volunteers job tended to choose activities afternoon refusing morning activity. In group work, proportion people preferring type capacity higher. night there were no representatives definitely among women, an evening men. summer season, male female respondents, regardless production regime, showed increase signs chronotype.
 CONCLUSION: intersexual features chronotypological inhabitants North have been established. With superposition extreme climatic geographical conditions, general pattern increased rigidity recorded. Male respondents different regimes, when assessing biorhythmic performance summer, demonstrated toward chronotype.