A Study On The Characteristics Of Physical Activity Of Primary School Children And Its Related Factors

Objectives:This thesis provides a theoretical basis for improving children’s physical activity levels and promoting the healthy development of primary school children’s physique by the exploration and discussion of primary school children physical activity characteristics and influencing factors.According to the objective measuring of accelerometer and subjective questionnaire, people can have better understanding on the status of pupils daily physical activity.Methods:Measuring the height, shape index of children which are in 3-5 grades of primary school in Nanjing and taking the BMI cut-off point of the Cole as the object of this study BMI evaluation criteria. Applying the ActiGraph GT3X accelerometer to measure the physical activity of children in seven consecutive days which includes five school days and two weekend days. By counting the physical activity in a 60s interval, children’s physical activity can be evaluated. Besides, using 100cm as the cut-off point, the number of students’sedentary breaks can be calculated. And the relationship between the results and students’ BMI characteristics can be discussed. The children’s physical activity and related factors’ situation can be evaluated through the amended leisure physical activity questionnaire (CLASS) in Chinese version.Results:(1) Male and female students obesity rates were 14.3% and 2.5% respectively, the male students’obesity rate was significantly higher than female(P<0.05)(2) For the male students, the average sedentary breaks, LPA and MVPA time is 849.47min,297.01 min and 37.99 min respectively. And for the female students, the sedentary breaks, LPA and MVPA time is 874.12mm,272.33min, and 32.55min respectively. The male students walk 8562 steps in average. And the female students walk 7875 steps in average. The male students’MVP time and average walk steps are significant higher than the female students (P<0.05), but for both of them, the MVPA time cannot achieve the international children’s physical activity daily recommended amount which is 60min. Besides, there is no difference between different grades. (P>0.05).(3) Students’daily MVPA time was significantly higher than the weekend MVPA time (P<0.05). Male students’MVPA time in the school days is higher than the MVPA time in the weekend. (P<0.01). In the students of different grades, the fourth grade students’ MVPA time in the school days is much higher than that in the weekend. For the children in different body shape, the MVPA time in the school days is higher than that in the weekend. (P<0.05). In the school days, the male students’MVPA time is significant higher than that of female. (P<0.05). In the weekend, the normal group’s MVPA time is much higher than that of overweight and obese groups. (P<0.05). Besides, the sedentary breaks time of normal group is less than that of overweight and obese groups. There is no significant difference between different gender, grades and BMI. (P<0.05)(4) If the child MVPA compliance rate is related to whether a park is close to a park (OR=3.21, p<0.05), whether there is a stadium nearby (OR=4.67, P<0.05). According to the study, it can be found that, if there is a park or a stadium nearby, the children’s physical activity compliance rate is relatively higher. Except that, this rate is affected by the household income and parents’educational level, the higher these two factors, the lower this rate.Conclusion:(1) students’ physical activity level reaches 60min/d which is the internationally recommended amount. And male students’MVPA and daily walk steps are higher than the female students. (2) The MVPA time in the school days is much higher than in the weekend. In terms of the sedentary breaks, there is no difference between different gender, grade and body shape. (3) Students with more sedentary breaks get lower BMI,and the change of LPA will be the primary cause of MVPA changing (4) If there is a park or a stadium nearby, the children’s physical activity compliance rate is relatively higher. Except that, this rate is affected by. the household income and parents’ educational level, the higher these two factors, the lower this rate.