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Life expectancy does not necessarily match quality of life (QOL). A cohort study involving a population of 10,107 in a certain city of Japan was conducted to evaluate active life expectancy (ALE), which has a direct relationship with QOL. The ALE that took functional recovery rates into account was 17.20 and 19.08 years for males and females respectively, at the age of 65. These values increased by 2.98 and 3.87 years for men and women, respectively, compared with when functional recovery rates were not considered. ALE may serve as an indicator for the objective evaluation of various public health services provided by local governments.

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The purpose of this study was to estimate daily energy expenditure (EE) and daily activity factor (DAF: EE/basal metabolism -1) of junior high school students in Japan using heart rate (HR) monitoring method. Daily activity recording and 24 hour HR monitoring were measured in all the subjects. The relational formulas between HR and oxygen consumption were obtained from bicycle ergometer test. Subjects were 112 junior high school students (68 male and 44 female) from the 1st to the 3rd year. The averages ofEE (kcal/kg) of the 1st, 2nd, and 3rd year students were 54.3, 46.7, and 44.5 (kcal/kg) for males and 50.1, 44.4, and 40.5 (kcal/kg) for females respectively. In the same way DAF were 0.80, 0.61, and 0.59 for males and 0.77, 0.65, and 0.51 for females. It was shown that EE (kcal/kg) and DAF have a tendency to decrease as school year increases in both male and female students.

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