Depth-Camera-Based System for Estimating Energy Expenditure of Physical Activities in Gyms
Journal
IEEE journal of biomedical and health informatics
Journal Volume
23
Journal Issue
3
Pages
1086
Date Issued
2019-05
Author(s)
Abstract
Energy expenditure (EE) monitoring is crucial to tracking physical activity (PA). Accurate EE monitoring may help people engage in adequate activity and therefore avoid obesity and reduce the risk of chronic diseases. This study proposes a depth-camera-based system for EE estimation of PA in gyms. Most previous studies have used inertial measurement units for EE estimation. By contrast, the proposed system can be used to conveniently monitor subjects' treadmill workouts in gyms without requiring them to wear any devices. A total of 21 subjects were recruited for the experiment. Subjects' skeletal data acquired using the depth camera and oxygen consumption data simultaneously obtained using the K4b2 device were used to establish an EE predictive model. To obtain a robust EE estimation model, depth cameras were placed in the side view, rear side view, and rear view. A comparison of five different predictive models and these three camera locations showed that the multilayer perceptron model was the best predictive model and that placing the camera in the rear view provided the best EE estimation performance. The measured and predicted metabolic equivalents of task exhibited a strong positive correlation, with r = 0.94 and coefficient of determination r2 = 0.89. Furthermore, the mean absolute error was 0.61 MET, mean squared error was 0.67 MET, and root mean squared error was 0.76 MET. These results indicate that the proposed system is handy and reliable for monitoring user's EE when performing treadmill workouts.
Subjects
Depth camera; energy expenditure (EE); physical activity (PA); treadmill workouts
SDGs
Other Subjects
Accelerometers; Calorimetry; Errors; Estimation; Mean square error; Monitoring; Sensors; Sporting goods; Biomedical measurements; Depth camera; Energy expenditure; Physical activity; Predictive models; Cameras; accuracy; adipose tissue; anthropometry; Article; body movement; calorimetry; computer prediction; electrocardiography; energy expenditure; female; heart rate; heart rate variability; human; kinematics; kinetics; locomotion; lung gas exchange; machine learning; male; mathematical model; obesity; oxygen consumption; physical activity; sensitivity and specificity; steady state; training; treadmill exercise; walking; adult; devices; energy metabolism; exercise; image processing; physiologic monitoring; physiology; procedures; statistical model; young adult; Adult; Energy Metabolism; Exercise; Female; Humans; Image Processing, Computer-Assisted; Male; Models, Statistical; Monitoring, Physiologic; Walking; Young Adult
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Type
journal article