青少年体力活动摄氧量预测方法的实验研究

Method of calculating oxygen uptake for adolescents in physical activity

[目的]建立适用于青少年的体力活动摄氧量预测方法。[方法]将80名青少年随机分为公式组60名和回代验证组20名,每组男女各半。公式组在跑台上以2、3、4、5、6、7、8 km/h的速度运动,每级负荷持续2.5 min,回代验证组以4.8、6.3、8.1 km/h的速度在场地运动,每级负荷持续10 min。在两组青少年按不同运动方案运动时测量其气体代谢参数和心率。公式组用统计学方法建立摄氧量预测方程,用回代验证组测量结果进行回代检验。用公式组4、6、8 km/h三种速度下的摄氧量实测值与所建公式、美国运动医学会(ACSM)推荐公式的预测值比较。[结果]建立了摄氧量预测的回归方程,男性:摄氧量(mL/min)=17.24×负荷心率+8.76×瘦体重(kg)-1288.22;女性:摄氧量(mL/min)=18.72×负荷心率+5.61×瘦体重-1588.79。预测摄氧量的平均相对误差均<10%,标准误差(SE)和总体误差(E)均低于ACSM公式。[结论]以负荷心率和瘦体重为自变量建立的摄氧量预测的多元回归方程,精确性优于ACSM推荐的公式,更适用于我国青少年体力活动摄氧量的预测。

[Objective] To establish a projection equation of oxygen uptake for Chinese adolescents in physical activity. [Methods] A total of 80 adolescents were randomly divided into the formula group of 60 members and the validation group of 20 members（evenly divided between male and female in each group）.The task of the formula group was reaching speeds of 2,3,4,5,6,7,8 km/h in treadmill,and the duration for each level of speed was 2.5 minutes.The task of the validation group was reaching speeds of 4.8,6.3,8.1 km/h on the sports-ground,the duration for each level of speed was 10 minutes.In both groups were tested the gas metabolism parameters and heart rate.In the formula group was established a projection equation of oxygen uptake with the statistical method.In the validation group,the results were taken into significance test and residual analysis,while.at the speeds of 4,6,8 km/h,real-time measurement of gas metabolism back was taken,comparisons were made with the speculated values that were from the projection equation and recommended by the ACSM（American College of Sports Medicine）. [Results] Regression equation was established for boys： oxygen uptake（mL/min） = 17.24×heart rate（bmp）＋ 8.76×LBM（kg）-1288.22,for girls： oxygen uptake（mL/min） = 18.72×heart rate（bmp）＋ 5.61×LBM（kg）-1588.79.The average relative errors for speculated and measured oxygen uptake in validation group were less than 10%.The SE（estimate of standard error） and E（error） were both lower than those recommended by ACSM. [Conclusion] According to the burden of heart rate and body weight as its independent variables,the accuracy of multiple regression equation of oxygen uptake is more reliable than that of the formula recommended by ACSM,and is more applicable for calculating oxygen uptake among Chinese adolescents in physical activity.