Investigating Shanghai Fenghua Junior High School Students' Daily Physical Activity In Different Time Period

Objective:In this paper,the physical activities of students in Grade six,seven and eight in Shanghai Fenghua Junior High School is studied.This thesis plans to use classification analysis to achieve the following purposes: to have a clear understanding of the physical activity level of middle school students;to explore the difference of overall activity level between physical education(PE)days and nonphysical education(non-PE)days;to analyze Shanghai Fenghua Junior High School students' physical activity in different time period(PE,recess,lunch time and leisure time),to explore the time distribution and activity level of moderate to vigorous physical activity(MVPA)in different time period(PE,recess,lunch time and leisure time);to study the effect of Demographics variables on physical activity in different time period(PE,recess,lunch time and leisure time).Method:The Actigraph accelerometers was used to measure the physical activity level of Shanghai Fenghua Junior High School students' daily physical activity in different time period.The accelerator data were screened and statistically analyzed by Actilife6.5 software,which was used to match the accelerator.In this way,the data of physical activity were obtained.According to the school class classification of physical activity occurred in the time period,the author used Excel to split the daily physical activity data,and used spss19.0 to do statistic analysis on those data.Results:1.The average time of MVPA of students in Shanghai Fenghua Junior High School is 23.53 minutes,of which the average time on weekdays is 25.31 minutes,and that on the weekends is 18.25 minutes.Only 1.49% students reached 60 minutes MVPA every day,and only 4.38% students reached 60 minutes MVPA on weekends.The average time of daily sedentary physical activity is 572 minutes.2.In the weekdays in Shanghai Fenghua Junior High School,the average daily MVPA time is 29.63 minutes on PE days,and 20.18 minutes on non-PE days.There was a significant difference between those two figures.3.In different periods of weekdays,the rank of MVPA time from the most to the least is PE,leisure time,recess and lunch time;The proportion of the time period from high to low followed by PE,recess,leisure time and lunch time.4.Boys spent an average of 29.45 minutes in MVPA during a week and girls18.02 minutes,and there was a significant difference;During the different time periods of weekdays,there were significant differences between boys and girls in PE,recess and lunch time,and there was no significant difference in leisure time in terms of MVPA time.5.There was no significant difference in time spent on overall physical activity among the three grades;During the four different time periods of weekdays,there were significant differences between the three grades in recess,leisure time and lunch time,and the MVPA time in recess was positively correlated with grade numbers;There was no significant difference in PE among the three grades.Conclusions:1.Shanghai Fenghua Junior High School students' average daily MVPA time is 23.53 minutes.The physical activity level is far less than the standard recommended by World Health Organization(WHO): 60 minutes moderate to vigorous physical activity per day.The average daily sedentary physical activity time is too long;The MVPA in weekdays is higher than that in weekends;2.In the weekdays,the MVPA level during PE days is higher than that in non-PE days,and there was a significant differences.So the PE class has a great positive effect on the level of physical activity of Fenghua Junior High School students.3.In different time periods of weekdays,the highest level of physical activity happens on PE classes,followed by the recess,leisure time and lunch time.4.In the four time periods on weekdays,the time spent in MVPA was higher among boys than girls.As for the MVPA,there was a significant difference between boys and girls in PE,recess and lunch time,while no significant difference in leisure time.5.In the four time periods on weekdays,there were significant differences among the three grades in recess,leisure time and lunch time.The MVPA time in recess was positively correlated with grade numbers while there was no significant difference in PE among the three grades.