Health practices in puberty are formed during infancy. There are few reports on bone mass acquisition during infancy, and there is little consensus on the relationship between Osteo Sono-assessment Index (OSI) and other factors.
In this study, we measured the height, weight, body fat percentage, foot size, and OSI of kindergarten-age children and administered a questionnaire survey. We studied 280 children (165 boys ; 115 girls) for whom consecutive data for 2 years were available. Factors that affect bone mass acquisition such as diet, exercise, and sleep were analyzed using multinomial logistic regression analysis, after adjusting for growth factors.
Factors that increased the OSI in boys included “sport lessons”, “under 10 hours of sleep”, and “going to bed before 10 pm”. Factors that increased the OSI in girls included “exercise”, “under 10 hours of sleep”, and “going to bed before 10 pm”. The average sleep duration was 9 hours 20 minutes.
Based on these findings, we recommend that sports and exercise become an important part of the health education of boys and girls, respectively. Further, a sleep duration of under 10 hours and a bedtime earlier than 10 pm should be encouraged in both boys and girls.
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