The purpose of this study was to examine the cycle structure about life habits in junior high school students. The participants were 9,167 children from 1st to 3rd grader in Setagaya city. Survey items included life habits (breakfast intake habit, sleeping habit, exercise habit, electronic media usage habit, and so on) and subjective symptoms of fatigue. We analyzed validities of “life before start of class” “subjective symptoms at school” and “life after school”. After that the cycle structure about those was analyzed by using structural equation modeling, using multiple group structural equation modeling to consider about sex difference. The main results in this study were as follows. It was confirmed that one day living have Cycle structure and not sex difference. Additionally, it was also confirmed that path coefficient from “life after school” to “life before start of class” was highest in cyclic structure about life habits in junior high school. All models exhibited good conformity modeling and confirmed validities of three latent variable and cycle structure about life habits in junior high school students.
These finding indicated that improvement of “life after school” is the most influential for good lifestyle habit. Although it has less impact than “life after school” improvement of “life before start of class” and “subjective symptoms at school” also have significance.

In Japan, child's sleep problems are worried about and its solutions are being searched for. In this situation, a hypothesis can be established by subjectively solving a difficult-to-realize problem if successfully measuring and visualizing melatonin which is considered as an important indicator for sleep. For that reason, the study purpose is to examine predictor variables of child's melatonin secretory pattern to search for utilizable alternative melatonin indicators in a future health education. The participants in this study were 50 children (26 boys and 24 girls) from 4th grade to 5th grade in an elementary school, and the data of 43 children (22 boys and 21 girls) who did not have the missing value were used for the analysis. Research was carried out only on weekdays in October 2016. The research was conducted only on weekdays in October 2016. The data of salivary melatonin level (night and morning) for each research subject was collected as bed time, wake-up time, the total number of steps in a day, axillary temperature (night and morning), and bar-gripping values (morning). The main results are as follows. 1) When making a comparison of salivary melatonin level for each research subject (morning and night), the study found 15.8％ for night＞morning (the N＞M group) and 42.1％ for night＜morning (the N＜M group). 2) The bed time was significantly late for the N＜M group (22 : 37±39.3) compared to the N＞M group (22 : 02±57.1) while the N＜M group (10,898.5±3,913.0 steps) was significantly smaller for the total number of steps in a day compared to the N＞M group (15,182.3±4,758.7 steps). 3) The study extracted bed time (β＝-0.452) and the total number of steps (β＝0.375) in a day as a significant predictor variables of melatonin secretory pattern by multiple regression analysis.
Based on the above-described facts, it is concluded that a future task will be a creation of health education on the basis of bed time and the total number of steps in a day.

Based on the educational experimental method, we investigated the effectiveness of instruction programs for learning fundamental throwing movements.
There were 58 participants who were second-graders (28 boys and 30 girls). Using the program that was developed (10 instructions of physical education), we instructed participants in “the active play of throwing.” We analyzed their throwing activities from the viewpoints of throwing motion and softballthrowing distance.
Throwing motion significantly improved in four of four criteria, and improvement in softball-throwing distance was significant. Participants' feelings about sprints and this program's practice had become significantly favorable.

The existence of the“adolescent spurt of growth”of humans has been regarded as self-evident.
Height is a representative indicator in the measurement of the human body used to evaluate growth and development. The timing of the “adolescent spurt of height”plays an important role in considering when various aspects of the child's education can best be conducted, including physical training and sex education.
However, in the Mlabri people, who had been leading lives of hunting and gathering as they moved through the forests of Thailand and Laos until the end of the 20th century, this“adolescent spurt of height”has not been observed.
The reason for this will be clarified by research to be done from now. The evidence to be reported from this research will provide important basic data for physical growth and anthropological studies.