抄録
The National Defense Academy serves as the core of national defense, and while there are reports of physical strength at the National Defense Academy, no process of improvement has been shown. In this study we measured the physical strength (50 m sprint, standing long jump, softball throw, modified pull-ups, 1,000 m run) of first to fourth year female students of the National Defense Academy in 2004 and 2011, and applied third-order polynomials in an investigation of the composition of change with progression through the school years. The results were as follows. Standing long jump, softball throw and modified pull-up records showed a trend for improvement with progression through the school years in 2004. Records for the 1000m run and modified pull-ups showed improvement trends with progression through the school years in 2011. There were no significant differences in the results for the 50m sprint in either 2004 or 2011. Next, we looked at the movement of the velocity curve, which is a differential, using a change composition that is basically shown with second-order polynomials. In a comparison of 2004 and 2011 the modified pull-ups showed velocity curves that had reversed concavity and convexity in the two years. That is, in 2004 second and third year students showed significant increases, whereas in 2011 second and third year students showed gradual decreases. The above findings that the physical strength of National Defense Academy students improved with the physical education program at the National Defense Academy may be valuable at least for national defense measures in Japan.
