An Equation of Calculating Oxygen Consumption of Physical Activity in Obese Children and Adolescents / 中国运动医学杂志

ABSTRACT

Objective To establish an equation of oxygen consumption in obese children and adolescents by multilevel linear model analytical method. Methods Sixty obese children and adolescents aged 11-16 years were randomly divided into the formula group(n=40) and back substitution verification group(n=20), with equal male and female. Subjects in formula group started exercise in the speed of 2km/h, increased lKm/h every 2.5 minutes till 8km/h, without gradient in treadmill and 80% HRmax was set as standard of exercise termination. Gaseous metabolism parameter and heart rate were measured for the set up of multiple linear regression equation of oxygen consumption. Back substitution verification was also made. Results Males' R~2 was 0.795 and females' R~2 was 0.75 in regression equation; oxygen consumption had a linear relationship (P0.001) with HR and LBM; The significance of variation coefficient and constants were obvious. The regression equation were set up as maleoxygen consumption(ml/min)=20.098xheart rate(bmp)+25.160×LBM(kg)-2935.835 and female oxygen consumption(ml/min)=19.863xheart rate(bmp)+26.551×LBM(kg)-2675.676. The predictive value of oxygen consumption of the average relative error was 6.84%～8.72% in male, and 6.53%～8.23% in female. Conclusion The multiple regression equation of oxygen consumption with heart rate and body weight as independent variables might be applied in the calculation of the oxygen consumption of physical activity in obese children and adolescents.