%0 Journal Article
%@ 2291-5222
%I JMIR Publications
%V 7
%N 10
%P e12335
%T Predicting Energy Expenditure During Gradient Walking With a Foot Monitoring Device: Model-Based Approach
%A Kim,Soon Ho
%A Kim,Jong Won
%A Park,Jung-Jun
%A Shin,Myung Jun
%A Choi,MooYoung
%+ Division of Sport Science, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Republic of Korea, 82 10 3285 1626, jjparkpnu@pusan.ac.kr
%K energy expenditure
%K physical activity
%K human walking
%K wearable devices
%K mHealth
%D 2019
%7 23.10.2019
%9 Original Paper
%J JMIR Mhealth Uhealth
%G English
%X Background: Many recent commercial devices aim at providing a practical way to measure energy expenditure. However, those devices are limited in accuracy. Objective: This study aimed to build a model of energy consumption during walking applicable to a range of sloped surfaces, used in conjunction with a simple, wearable device. Methods: We constructed a model of energy consumption during gradient walking by using arguments based in mechanics. We built a foot monitoring system that used pressure sensors on the foot insoles. We did experiments in which participants walked on a treadmill wearing the foot monitoring system, and indirect calorimetry was used for validation. We found the parameters of the model by fitting to the data. Results: When walking at 1.5 m/s, we found that the model predicted a calorie consumption rate of 5.54 kcal/min for a woman with average height and weight and 6.89 kcal/min for an average man. With the obtained parameters, the model predicted the data with a root-mean-square deviation of 0.96 kcal/min and median percent error of 12.4%. Conclusions: Our model was found to be an accurate predictor of energy consumption when walking on a range of slopes. The model uses few variables; thus, it can be used in conjunction with a convenient wearable device. 
%M 31647467
%R 10.2196/12335
%U https://mhealth.jmir.org/2019/10/e12335
%U https://doi.org/10.2196/12335
%U http://www.ncbi.nlm.nih.gov/pubmed/31647467