Difference of chronotypes makes influence to cognitive performance of individuals in routine duties. In this paper, 55 subjects with different chronotypes were subjected to continuous sleep deprivation for 30 h by using the constant routine protocol, during which core body temperature was measured continuously, and subjective sleepiness self-rating and the performance of selective attention were measured hourly. The results showed that the phase difference of core body temperature has no significant difference, yet the amplitude and term difference among the three chronotypes are significant. There was an advance in phase between subjective sleepiness self-rating and core body temperature, and the self-rating sleepiness of evening type came the latest, and the self-rating sleepiness of morning type dissipated the fastest. The response time of selective attention showed a 2 h phase delay with subjective sleepiness self-rating. And the analysis of core body temperature showed that the later the chronotype was, the greater the phase delay was. The correct rate of selective attention of different chronotypes were inconsistent with delay of subjective sleepiness self-rating and core body temperature. We provide reference for industry, aviation, military, medical and other fields to make a more scientific scheduling/ shifting based on cognitive performance characteristics of different chronotypes.
ObjectiveTo systematically review the association between chronotype and depressive symptoms among adolescents. MethodsCNKI, VIP, WanFang Data, PubMed, ScienceDirect and Web of Science databases were electronically searched to collect studies on the association between adolescent chronotype and depressive symptoms from inception to January 17th, 2022. Two reviewers independently screened literature, extracted data, and assessed the risk of bias of the included studies. Meta-analysis was then performed using Stata 16.0 software. ResultsA total of 12 studies were included. The results of meta-analysis showed that there was an association between chronotype and depressive symptoms (Fisher’s Z=−0.19, 95%CI −0.21 to −0.17, P<0.001). ConclusionCurrent evidence shows that evening-type chronotype may be a risk factor for depressive symptoms among adolescents. Due to the limited quality and quantity of the included studies, more high-quality studies are needed to verify the above conclusion.
ObjectiveTo systematically review the association between chronotype and quality of life in adolescents. MethodsPubMed, EMbase, Cochrane Library, Web of Science, CBM, WBM, VIP, WanFang Data and CNKI databases were electronically searched to collect studies on the association between chronotype and quality of life in adolescents from inception to April 21, 2022. Two reviewers independently screened the literature, extracted data and assessed the risk of bias of the included studies. A qualitative systematic review was then performed. ResultsA total of 7 studies were included. The results of systematic review suggested that the association between chronotype and quality of life in adolescents was statistically significant. Moreover, chronotype completely affected quality of life via insomnia symptoms, sleep related irrational cognition and general self-efficacy. ConclusionCurrent evidence shows that chronotype is associated with quality of life in adolescents. Due to the limited quality and quantity of the included studies, more high quality studies are needed to verify the above conclusion.