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Chronobiology International
The Journal of Biological and Medical Rhythm Research
Volume 26, 2009 - Issue 7
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Short Communication

PHOTOPERIOD AT BIRTH DOES NOT MODULATE THE DIURNAL PREFERENCE IN ASIAN POPULATION

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Pages 1470-1477 | Received 31 Mar 2009, Accepted 19 Jun 2009, Published online: 16 Nov 2009
 

Abstract

Two research groups reported that diurnal preference in Canadian and South European populations was modulated by the season of birth. The aim of the present study was to examine this association in the Japanese population. In this study, 1156 college students were administered the Morningness-Eveningness Questionnaire and asked the date and place of birth. Our results demonstrated that neither photoperiod nor season of birth modulated diurnal preference in the Japanese population. Two biological differences are reported to exist between Caucasians and Asians: polymorphisms of circadian clock genes and difference in ocular photosensitivity. These ethnic differences might characterize the circadian photosensitivity in infancy. (Author correspondence: [email protected]).

ACKNOWLEDGMENTS

The authors would like to acknowledge the excellent secretarial work by Ms. Fusako Takao. This study was supported financially by the Grants-in-Aid #21590262 and #60225399 from The Japan Society for the Promotion of Science (M.T.), as well as the Special Grant for Young Researchers from Tokai University (M.T.).

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