Abstract

Intervention study to improve meal habit, sleep habit, circadian typology and school marks in Japanese elementary school students

Highlights

  • In accordance with the 24 hours commercialization society which is rapidly going on in current Japanese society which gives children new environmental situations as zeitgebers

  • At least for the students who had been originally evening-typed, the intervention on meal habits may be effective for longer sleep hours and improved school achievement marking

  • Mental health has strong links to circadian typology: lower mental health like as depression can be associated with evening-typed life [1,2,3,4,5,6,7]

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Summary

Introduction

In accordance with the 24 hours commercialization society which is rapidly going on in current Japanese society which gives children new environmental situations as zeitgebers. Convenient sores are very common in Japanese society and they count more than 20 shops in a small society with 300,000 population, Kochi city for example and smart phones distribute to 98% of junior high school students affiliated to Faculty of Education, Kochi University. Such current situation means that clear light-dark cycles and meals regularity on the times of day tend to disappear for the entrainment of their circadian clocks. Such intervention studies for small children attending elementary school or younger are limited to a few ones

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