This study was aimed to clarify how the frequency of play is considered with recess time, school time and daily level of physical activity and perceived exercise competence, and to clarify the relationship between achievement of the recommended 60 minutes of physical activity and level of physical activity.

The results were as follows:

1．Before the start of classes, there was no difference in the amount of physical activity due to the frequency of play in the number of steps and LC4-9 hours. However, the group with a high frequency of play showed a higher level of physical activity during the recess between classes and the lunch recess time.

2．The ratio of the physical activity time occupied in recess time tended to be higher in the group with the more frequency of the play.

3．In terms of the relationship with perceived exercise competence, significant differences were seen between the different frequencies of play in “recognition of physical competence,” “sense of control” and “sense of acceptance.”

  The aforementioned findings suggested that increasing the frequency of play with physical activity during recess time increases the level of physical activity, leads to achievement of the recommended time of physical activity, and enhances perceived exercise competence feeling.

  In Japan, there is an urgent problem increased the patients of lifestyle-related diseases. To prevent lifestyle-related diseases, children must understand for the correct knowledge and desirable dietary habits related to diet and acquire the self-health management skills. Therefore, we developed the KHJ(Kurashiki city version of Health Judge). The KHJ is dietary and physical assessment software. We have conducted dietary education with the KHJ in home economics classes. In this study, we evaluated the change of consciousness before and after KHJ's implementation and examined effective nutritional education method. Children had acquired correct knowledge about food. Diet education using KHJ was useful. Furthermore, in order to stay healthy for a lifetime, education that utilizes continuous KHJ is important.