| ObjectiveTo analyze the dynamic change of students' physical fitness in Henan province from 2000 to 2014 and to explore the promoting and interfering factors of biological characteristics on sports-related physical fitness,so as to provide theoretical basis for improving students' sports-related physical fitness.MethodsThe database of National School Student Physical Fitness and Health Survey of primary and middle school students at age of 7 to 18 years old of Han nationality in Henan province in 2000,2005,2010 and 2014 were used,of which the height,weight,vital capacity,blood pressure,50-meter run,standing long jump and other indicators were used.SPSS21.0 was used to analyze the students' physical fitness status,and the canonical correlation analysis and ridge regression analysis were used to analysze the influencing factors of biological characteristics on sports-related physical fitness.Results1.The physical fitness of students in Henan province from 2000 to 2014 The status of physique status and health-related physical fitness of primary and middle school students at age of 7 to 18 years old in Henan province were increased from 2000 to 2014.The increasing of height in urban schoolboys,rural schoolboys,urban schoolgirls and rural schoolgirls in Henan province were 3.11 cm,3.64 cm,2.42 cm and 3.04 cm on average from 2000 to 2014,respectively,weight were increased by 3.73 kg,4.36 kg,3.32 kg and 3.15 kg,chest circumference were increased by 2.11 cm,2.61 cm,1.50 cm and 1.51 cm,the vital capacity were increased by 57.61 ml,31.46 ml,-46.61 ml and-12.63 ml,and for grip strength were increased by 6.47 kg,7.27 kg,6.20 kg and 6.05 kg respectively.But there were a decline in sports-related physical fitness,the prevalence rate of overweight and obesity were rised as well as the prevalence of high normal blood pressure.2.The results of canonical correlation analysis The canonical correlation coefficient between the indicators of individual biological characteristics and the indicators of sports-related physical fitness in urban schoolboys,rural schoolboys,urban schoolgirls and rural schoolgirls were 0.922,0.921,0.834 and 0.841 respectively,and of which the canonical correlation coefficients were statistically significant.3.The results of ridge regression analysis The ridge regression model of 50-meter run was statistically significant,the ridge regression determination coefficient was 0.512,and the main influencing factors of 50-meter run were height,triceps skinfold thickness subscapular skinfold thickness and handgrip strength.The ridge regression model of standing long jump was also statistically significant,the ridge regression determination coefficient was 0.756,and the main influencing factors of standing long jump were height,sitting height,triceps skinfold thickness,subscapular skinfold thickness,handgrip strength.The ridge regression determination coefficient was 0.210 of strength quality and the main influencing factors were weight,sitting height,triceps skinfold thickness,handgrip strength.And for endurance running,the ridge regression determination coefficient was 0.482,and the main influencing factors were height,weight,chest circumference,sitting height and handgrip strength.Conclusions1.From 2000 to 2014,the development of physical condition of primary and middle school students in Henan province were unbalanced,the physique status of primary and middle school students were increased,and the growth level of health-related physical fitness also showed a trend of improvement,but the overall level of sports-related physical fitness became decreasing.2.There were positive correlations between the indicators of individual biological characteristics and the indicators of sports-related physical fitness.3.The main influencing factors of four sports-related physical fitness were height,triceps skinfold thickness and handgrip strength,while the intensity and direction of the indicators of individual biological characteristics on different sports-related physical fitness were different. |
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