Journal
CHRONOBIOLOGY INTERNATIONAL
Volume 28, Issue 7, Pages 638-642Publisher
INFORMA HEALTHCARE
DOI: 10.3109/07420528.2011.597529
Keywords
Adolescents; Birth season; Circadian typology; Infants; Older students
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Funding
- Academic Supporting Foundation by Kochi University
- Academic Supporting Foundation by Faculty of Education, Kochi University
- Foundation from Japan Society for the Promotion of Science [22370089]
- Grants-in-Aid for Scientific Research [11J10971] Funding Source: KAKEN
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Several studies suggest that season of birth differentially affects the physiological characteristics of humans. Those living at relatively high latitude, such as Canada, Spain, and Italy (44 degrees N-45 degrees N), and born in the fall tended to be morning-type persons in comparison to those born in other seasons. There are relatively little data on the affect of season of birth on people residing at low latitude. Here the authors show that at low latitude, Kochi, Japan (33 degrees N), the effect of season of birth on the morningness chronotype is confined to young children aged 1-12 yrs, disappearing in elderly persons. Only female participants aged 2-12 yrs born in the fall, especially in November, were significantly morning-typed (p < .001) in comparison to those born in the other seasons, whereas there were no such significant season-of-birth differences in morningness-eveningness preference among male participants. Moreover, both female and male participants aged 13-25 yrs showed no significant seasonal differences in morningness-eveningness preference. The small effects detected in this study might be due to smaller seasonal change in day length at the relatively lower latitude of Kochi. (Author correspondence: haratets@kochi-u.ac.jp)
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