Intensity Characteristics And Influencing Factors Of Extracurricular Physical Activity In Adolescents (13-15) In Shanghai

The purpose of this study is to explore the factors that affect the extracurricular physical activity of adolescents by investigating the intensity characteristics of extracurricular physical activities in 13-15 years old adolescents in Shanghai,to provide theoretical and data support for the current extracurricular sports reform to improve the physical health of adolescents,and to promote its comprehensive development both of physical and mental health.In this study,the ActiGraph GT3 X + accelerometer was used to investigate the intensity characteristics of extracurricular physical activity of 13-15 years old adolescents in Shanghai.A total of 488 valid samples were collected.The results showed that the average daily extracurricular physical activity were 118.7 minutes,it included 84.0 minutes of low intensity extracurricular physical activity,accounting for 70.8% of the total time of extracurricular physical activity;16.2 minutes of medium intensity extracurricular physical activity,accounting for 13.6% of the total time;18.5 minutes high-intensity extracurricular physical activity,15.6% of the total time;34.7 minutes of medium-high intensity extracurricular physical activity,accounting for extracurricular physical activity of the total time of 29.2%.Exploring the factors(gender,grade,BMI,etc.)whether and how to influence the intensity of extracurricular physical activity.The results showed that boys was better than girls of extracurricular physical activity that boys was higher than girls of every intensity extracurricular physical activity time,and the total time between boys and girls of each LPA,MPA,VPA,MVPA extracurricular physical activity showed significant difference(P<0.05).The intensity of extracurricular physical activity in different grades decreased with the increase of grade.Every intensity of extracurricular physical activity time in school day is much higher than the weekend,school days of high-intensity extracurricular physical activity time is 1.53 times than weekend,every intensity of extracurricular physical activity on the school day and the weekend all had significant differences.Every intensity of extracurricular physical activity was slightly higher than that of physical education day,but there was no significant difference between the two groups(P> 0.05).Overweight young people had the highest time of every intensity of extracurricular activities,obese adolescents in extracurricular physical activity were the worst in MPA,VPA,MVPA extracurricular physical activity.To explore the association of adolescents with obesity and physical activity still need to expand the sample size in depth the study.Based on the above results,the questionnaire survey was used to investigate the factors influencing the factors of extracurricular physical activity in adolescents.The factors were analyzed as four aspects: school organization guidance and facilities,subjective consciousness and organization form,family support and consumption,environment and skills.Among them,adolescents extracurricular low intensity physical activity by family support and consumption,environmental and skills impact,and family support and consumption impact is greater than the environment and skills;medium-intensity of extracurricular physical activity was influenced by the environment and skills;high-intensity extracurricular physical activity was influenced by the environment and skills,subjective consciousness and organizational form,family support and consumption impact,among which the influence of environment and skills is the biggest,followed by subjective consciousness and organization form,then family support and consumption.Extracurricular high intensity physical activity by environment and skills,subjective consciousness and organization The influence of environment and skill factors is greater than subjective consciousness and organizational form.