Characteristics Of Physical Activity Of Children Aged 9-11

Objective: To investigate the current status and characteristics of physical activity of children aged 9-11 years,analyze the differences in physical activity of children with different BMI levels.Then explore the age transition of children's physical activity patterns by analyzing the effective tracking data of the same population for three consecutive years.This study in order to provide research basis for physical activity.Method: This study selected 9-year-old(third grade)students from Huilongguan primary school to conduct a three-year physical activity test.The valid data is 239(male 121,female 118)for the 9-year-old sample;236(male 118,female 118)for the10-year-old sample;104(male 50,female 54)for the 11-year-old sample,the same population for three consecutive years is 58(male 27,female 31).Results:1.The basic situation of children's MVPA is: 62.4min/d for 9-year-old boys,50.8min/d for girls,64.3 min/d for 10-year-old boys,47 min/d for girls,63.3 min/d for11-year-old boys,47.9 min/d for girls.More than half of the boys in the three age groups reached the WHO recommendation,the female standard compliance rate is only about 20%.2.The sedation time(SB)of the three age groups showed that the school days were higher than the weekend days,and there were significant differences(P<0.05).The light physical activity time(LPA)showed that the school days were higher than the weekend days,but the difference was not significant.The MVPA of the 9-10 year old boys had little difference between the school days and the weekend days,but the MVPA time of the school days were significantly higher at the age of 11 on weekends(P<0.05).The MVPA time of girls in three age groups all showed that the school days were higher than the weekend days,and there was a significant difference in 9 and 11 years old group(P<0.05).3.Regardless of age,the SB of the non-obese group was lower than that of the overweight and obese group,and there were significant differences(P<0.05).LPA also showed that the non-obese group was higher than the overweight and obese group(P<0.01).MVPA was higher in the non-obese group than in the overweight and obese group,and there was a significant difference at the age of 9 and 10 years old(P<0.01).4.The SB of the overweight and obese group on the school days increased with age,and the change was significantly different(P<0.01).The LPA of the overweight and obese group decreased year by year,whether on the school days or the weekend days,and the change was significant(P<0.01).5.The number of active students in boys is twice as high as that of girls.The number of sit-ups is less than half of girls.After 3 years of follow-up survey,the number of active boys increased by 4 and decrease by 1.The number of girls increased by 6 and decreased by 4.Conclusion: The children's physical activity level of children aged 9~11 is lower,and the overall characteristics of male students are higher than female students,school days are higher than weekend days.The BMI level caused differences in physical activity.The level of physical activity in the non-obese group was higher than that in the overweight group,the LPA in the overweight group decreased with age.The changes in physical activity patterns of boys in the tracking population were relatively stable,and the pattern of girls changed greatly.