Examinations of the optimal distance for elementary school in a race

This research analyzed 100m race from the third grade to the six grade of elementary school for 64 people. They were filmed in VTR picture during 100m race. Using the VTR pictures. We calculated average speed. stride frequency and stride length. The results obtained were as follows: 1 The average speed of the girl had increased up to 6.668m/s at the 6th grade from 5.687m/s at the 3rd grade and of the boy had increased up to 6.862m/s at the 6th grade from 5.959m/s at the 3rd grade. The difference has not seen for the stride frequency. Girl's stride length has expanded up to 1.667m at the 6th grade from 1.404m at the 3rd grade. and boy's stride length has expanded up to 1.678m at the 6th grade from 1.450m at the 3rd grade. As for the girl. the stride length of the 4th grade is longer than the 3rd grade. and the 5th grade is longer than the 4th grade. and the 5th grade and the 6th grade has not seen significant. As for the boy' s stride length. the 3rd grade and the 4th grade. and the 4th grade and the 5th grade have not seen significant. And the stride length of the 5th grade is longer than the 3rd grade. and the 6th grade is longer than the 3rd. 4th. 5th grade. 2 The highest speed of the boys in the 5th grade was 7.207m/s. and of the boys in the 6th grade was 7.644m/s. The highest speed of the girls in the 5th grade was 7.063m/s. and of th girls in the 6th grade was 7.550m/s. 3 When the decreasing rate has seen. the speed has lost 9.3-12.7%. the stride frequency has lost 7.6-12.5%. and the stride length has lost 2.4-4.3%. The decrease at the speed is suggested dependence on the decrease in the stride frequency. 4 If the maximum speed maintenance section was assum d until 2% decrease. the girls in the 3rd grade was 1O-30m section. the boys in the 3rd grade was 20-40m section. the boys and girls in the 4th and 5th grade were 20-50m section and the boys in the 6th grade was 20-60m section. The highest speed maintenance sections were four sections and the top athlete's speed decrease was about 7%. Based on these findings. the distance of sprint race was about 70m for boys and girls in the 3rd grade of elementary school. about 80m for boys and girls in the 4th and 5th grade. and girls the 6th grade. about 90m for boys in the 6th grad