The purpose of this study was to determine the relationship between footprint, motor ability, and obesity with aging in 4- to 12-year-old children (n＝3944, 1957 boys and 1987 girls). We measured the footprint using Pedoscope, and measured the subjects' motor ability while performing 25m sprint, broad jump, and ball throw. The footprint was classified into normal feet and flat feet. Sprint and broad jump ability with non-normal foot girls were significantly lower than those for the normal foot after the age of 7. Obesity with non-normal foot types was significantly higher than obesity with normal feet after the age of 10 boys. Sprint ability with non-obesity boys were significantly higher than obesity after the age of 10, jump ability with non-obesity was significantly higher than obesity after the age of 8, and throw ability with non-obesity boys were significantly higher than obesity after the age of 10. Sprint ability with non-obesity girls were significantly higher than obesity after the age of 7, jump ability with non-obesity was significantly higher than obesity after the age of 8, 11, and 12. Sprint ability with non-obesity of normal feet were significantly higher than obesity of normal feet from 10- to 12-year-old boys and the age of 12 girls, obesity of flat feet the age of 12 boys and the age of 9 and 10 girls. Broad jump with non-obesity of normal feet were significantly higher than obesity of normal feet the age of 11-12 boys and 12 girls, obesity of flat feet the age of 12 boys and 10 girls, non-obesity of flat feet the age of 12 girls. In conclusions, in terms of footprint, motor ability, and obesity in children, it was suggested that it was important occasion to change after 9 years old.
