Analysis of the trend of sports quality among Li nationality students aged 7-18 from 2005 to 2014 in Hainan

Objective To analyze the trend of sports quality among Li Nationality students aged 7-18 from 2005 to 2014,and to provide a scientific reference for making effective measures for promotion of their physical health.Methods The data collected by "Chinese national survey on students' physique and health status" of Li Nationality in Hainan from 2005 to 2014 were used to analyze their quality of velocity,lower-limb explosive strength and endurance.Results In 2014,Li Nationality students' ports quality was improved in correlation with age,boys did better than girls,but girls attainted their best results of 50 m dash at age of 11-13 years old.From 2005 to 2014,the score of 50 m dash was improved significantly among Li Nationality girls by 0.43 s (P<0.01),no obvious increase was found among boys,while the results of 50 m dash improved significantly among students aged 7 to 12 (P<0.01,0.34 s' faster among boys and 1.04 s' faster among girls);the score of standing long jump was improved by 3.75 cm among girls,and no obvious increase was found among boys,,while boys aged 13 to 18 increase their result by 5.94 cm(P <0.01).As for endurance running,students aged 7-12 achieved less(P<0.01).Boys' speed was decreased by 3.43 s,while girls by 2.75 s.By contrast,an obvious decrease was found in endurance running among students aged 13-18(P<0.01,20.26 s' slower among boys and 6.12 s' slower among girls).Conclusion Primary and middle school students of Li Nationality in Hainan showed different changing trend in different sports indicators from 2005 to 2014.Velocity,lower-limb explosive strength are improved,but the endurance presented downward trend among students.