Research On The Changing Trend And Causes Of Physical Health Of Primary And Secondary School Students In Nanjing From2018 To 2021

Constitution is a relatively stable characteristic of the human body in terms of body shape,physiological function,athletic ability and social adaptability on the basis of congenital heredity and acquired.Physical fitness is the basic component of human health,the premise and foundation of health,and physical fitness reflects human health to a certain extent.The physical condition of students is related to the well-being of thousands of families.Therefore,research on students’ physical fitness has always been a hot spot of social concern.Through 40 years of efforts,the country has established the world’s largest and most distinctive physical fitness research system.The survey data shows that in the past 30 years,The physical health status of students in our country shows a continuous downward trend.What about the physical health status of students in Nanjing,the capital city of China’s economically developed regions? This paper takes the 2018-2021 Nanjing primary and secondary school students’ physical fitness trends as the research object,and reveals the Nanjing City through the methods of literature materials,questionnaires,expert interviews,physical fitness measurement,mathematical statistics,and a combination of qualitative and quantitative analysis.The dynamic trend of physical changes of primary and secondary school students,explore its influencing factors from multiple perspectives such as society,policy,school,and family,and propose corresponding strategies.The research conclusions are as follows:1.The physical fitness of primary and secondary school students aged 7-17 in Nanjing generally showed a downward trend from 2018 to 2020,dropped to a historical low in2020,and began to pick up gradually in 2021,showing an upward trend.In the past four years,the obesity rate of primary and secondary school students has increased year by year,and in 2020,it will exceed the WHO 10% safety threshold.12.4% in2021.2.In the next three years,the speed quality of 7-14-year-old boys and 7-13-year-old girls will continue to decline,while the speed quality of primary and secondary school students in other age groups will remain the same or improve slightly.The outbreak quality of primary and secondary school students in Nanjing showed an overall increase.The strength quality of primary and secondary school students in the lower age group will continue to decline in the next three years,and the strength level of primary and middle school students in the older age group will stabilize or increase slightly.The flexibility quality of primary and secondary school students in Nanjing will be greatly improved.For students aged 7-12,agility and cardiorespiratory endurance will be significantly improved.And in the next three years,Nanjing’s primary and secondary school students’ endurance quality will generally decline.3.Factors affecting the physical health of primary and middle school students in Nanjing: social factors,family factors,policy factors and school factors.