Study On The Validity Of Cardiorespiratory Fitness Of Plateau Children And Adolescents Measured By 20 M Shuttle Run Test And Cardiorespiratory Fitness Of Tibetan Children And Adolescents

Cardiorespiratory fitness is an important basis of various physical functions and physique,and it is the core element of physical fitness and health evaluation of children and adolescents.Due to the high requirements for cardiorespiratory fitness testing,the original scientific research conditions in Tibet are limited,and there are few studies on objective measurement data to analyze the cardiorespiratory fitness of children and adolescents in Tibet.Scientifically and accurately measure the cardiorespiratory fitness of Tibetan children and adolescents,and explore related factors affecting the differences in the cardiorespiratory fitness of Tibetan children and adolescents from multiple angles Research and analysis of the impact of plateau environment on cardiorespiratory fitness provides a reference basis.ObjectivesTo explore the scientific and feasibility of measuring cardiorespiratory fitness of children and adolescents in high altitude area with 20m shuttle run test.To understand and master the data of cardiopulmonary endurance in Tibetan children and adolescents.To analyze the effects of physique,behavior and other factors on cardiopulmonary endurance of Tibetan children and adolescents.MethodsBased on the study of 70 children aged 11¹5 in Lhasa,20m shuttle run test and power vehicle step by step load tests were conducted to test the effectiveness of 20m reentry to measure cardiorespiratory fitness in high altitude children and adolescents.A total of 1644 students aged 9¹8 in Lhasa were selected by quota sampling to study cardiorespiratory fitness among children and adolescents.All subjects underwent 20m shuttle run test,physical and health tests,and health behavior and lifestyle questionnaires.Spss23.0 was used to analyze the test data,and the frequency,percentage,and mean±standard deviation were used for descriptive statistics of each indicator.Pearson correlation analysis and partial correlation analysis were used for correlation analysis.Independent sample T test,one-way analysis of variance,and chi-square test were used to test the differences between the groups.Linear regression analysis was used to analyze the factors related to the cardiorespiratory fitness of children and adolescents.A p<0.05 was considered a significant difference.Results1.In the validity test,the relative value of the maximum oxygen uptake was estimated to be 39.2ml/kg·min,respectively,during the 20m shuttle run test.The values was 40.1 ml/kg·min,respectively,and the correlation coefficients of the two test methods was r=0.658,respectively.In the Bland-Altman diagram,2.8%?2/68?of the points are outside the 95%CI,and most of the results are distributed within the consistency limit,indicating that the results obtained by the two test methods are more consistent.2.The average Laps,MAS and VO₂max of Tibetan children and adolescents in the20m shuttle run test were 29.4 times,10.1 km/h and 39.8 ml/kg.min,respectively.Among them,the average VO₂max of boys was 41.8 ml/kg.min,which was higher than that of girls 37.9 ml/kg.min;the average VO₂max of Tibetan children and adolescents was 40.2 ml/kg.min,which was higher than 38.7 ml/kg.min of Han.Cardiorespiratory fitness levels of normal weight boys and girls are higher than those of overweight and obese boys.With age,Laps and MAS of Tibetan children and adolescents continued to increase,and VO₂max continued to decrease.3.Among the socio-demographic factors,there was significant correlation between sex,age,nationality and the indexes of cardiopulmonary endurance in Tibetan children and adolescents.4.In physiological indexes,resting heart rate and blood oxygen saturation were negatively correlated with laps,MAS and VO₂max in 20m shuttle run test,while hemoglobin content was positively correlated with laps and MAS in 20 meter turn back run.5.Among the physical fitness indicators,the effects of the 50-meter run and standing long jump on the 20m shuttle run test Laps,MAS,and VO₂max were significant.Among them,the performance of the 50-meter run has the highest degree of impact.For each 50-meter run,the Laps,MAS,and VO₂max are increased by 2.299 times,0.136 km/h,and 0.733 ml/kg.min.6.After controlling for sociodemographic factors,vital capacity was significantly positively correlated with Laps,MAS,and VO₂max in the 20-meter return run.7.Analysis of body morphological indicators showed that skeletal muscle mass,weight,body fat rate,and height had significant main effects on VO₂max.Among them,skeletal muscle mass was significantly positively correlated with Laps,MAS,and VO₂max,and had the greatest impact.8.There was a significant positive correlation between weekly mid-and high-intensity physical activity time and cardiorespiratory fitness indicators;sedentary behavior time on school days and weekends was not significantly correlated with cardiorespiratory fitness indicators.9.Life satisfaction and father's career approach to manual labor were positively correlated with cardiopulmonary endurance.Conclusions1.The results showed that the 20 m shuttle run test can be used as an effective method to measure the cardiopulmonary endurance of children and adolescents in high altitude.2.CRF decreases with age.CRF of children and adolescents in Tibet is lower than the plain area and the global average.3.Hemoglobin content,vital capacity,standing long jump score,skeletal muscle mass,cumulative time of high-intensity physical activity per week were positively correlated with CRF,and body fat rate,50 m running time were negatively correlated with CRF.Among sociological demographic factors,gender,age and ethnicity have a significant impact on the heart and lung endurance of Tibetan children and adolescents.