A New Equation to Estimate Energy Expenditure Using Heart Rate in Children

The first aim of this study was to develop equations predict physical activity energy expenditure (PAEE) for children utilizing heart rate monitors (HRM) and vector magnitudes (VM) from accelerometers. second cross-validate the developed PAEE prediction compare pre-existing accelerometer-based equation (i.e., Trost). Seventy-five students in elementary school (from 10 13 years old) were classified into an calibration group (N = 50, 33 boys 17 girls) a cross-validation 25, 20 5 girls). Participants simultaneously wore portable indirect calorimeter (Cosmed’s K4b2), monitor on chest, accelerometer right side waist. Then, participants performed series various intensity activities. (EE) measured by K4b2 set as dependent variable. Multiple regression analysis derive equations. heart-rate-based EE had explanatory power adj. R2 0.814 0.802. VM-based indicated high mean absolute percent errors (MAPE) at light, moderate, vigorous intensity. included range equivalence limit all activities, but VM showed some overestimation beyond range. agreement between criterion estimated lower than approach with demonstrated higher accuracy results current indicate that can be potential method estimating children’s PAEE.