[Physical activity/sports and bone mineral density].

This study observed the amount of exercise of Japanese schoolchildren as recorded by pedometer. Schools are necessary venues to increase children's mobility, but home environments are hotbeds for lack of exercise on weekends and during holidays and vacations. This research measured the L(2 - 4)BMD of 185 male and female primary schoolchildren using a DEXA method.

Correlation between forearm bone mineral density and body composition in Japanese females aged 18-40 years.

Objective: The purpose of this study was to clarify the relationship between forearm bone mineral density (BMD), body mass index (BMI), and body composition focusing on body fat percentage (BF%) in Japanese females 18 to 40 years old.

Methods: Subjects were 2,280 females 18-40 years old. Anthropometric measurements were taken, and a medical history was obtained by questionnaire, including age at the time of the study and age at menarche.