RT Journal Article T1 The Validity of the Energy Expenditure Criteria Based on Open Source Code through two Inertial Sensors A1 Martín-Martín, Jaime A1 Wang, Li A1 De Torres García, Irene A1 Escriche-Escuder, Adrián A1 González-Sánchez, Manuel A1 Muro Culebras, Antonio Luis A1 Roldán-Jiménez, Cristina A1 Ruiz‐Muñoz, María A1 Mayoral Cleries, Fermín A1 Biró, Attila A1 Tang, Wen A1 Nikolova, Borjanka A1 Salvatore, Alfredo A1 Cuesta-Vargas, Antonio K1 Energía AB Through this study, we developed and validated a system for energy expenditure calculation, which only requires low-cost inertial sensors and open source R software. Five healthy subjects ran at ten different speeds while their kinematic variables were recorded on the thigh and wrist. Two ActiGraph wireless inertial sensors and a low-cost Bluetooth-based inertial sensor (Lis2DH12), assembled by SensorID, were used. Ten energy expenditure equations were automatically calculated in a developed open source R software (our own creation). A correlation analysis was used to compare the results of the energy expenditure equations. A high interclass correlation coefficient of estimated energy expenditure on the thigh and wrist was observed with an Actigraph and Sensor ID accelerometer; the corrected Freedson equation showed the highest values, and the Santos-Lozano vector magnitude equation and Sasaki equation demonstrated the lowest one. Energy expenditure was compared between the wrist and thigh and showed low correlation values. Despite the positive results obtained, it was necessary to design specific equations for the estimation of energy expenditure measured with inertial sensors on the thigh. The use of the same formula equation in two different placements did not report a positive interclass correlation coefficient PB IOAP-MPDI YR 2022 FD 2022-03-26 LK https://hdl.handle.net/10630/24113 UL https://hdl.handle.net/10630/24113 LA eng NO Martín-Martín, J.; Wang, L.; De-Torres, I.; Escriche-Escuder, A.; González-Sánchez, M.; Muro-Culebras, A.; Roldán-Jiménez, C.; Ruiz-Muñoz, M.; Mayoral-Cleries, F.; Biró, A.; Tang, W.; Nikolova, B.; Salvatore, A.; Cuesta-Vargas, A.I. The Validity of the Energy Expenditure Criteria Based on Open Source Code through two Inertial Sensors. Sensors 2022, 22, 2552. https://doi.org/10.3390/s22072552 NO This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 823871 (iGame). Partial funding for open access charge: Universidad de Málaga DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 20 ene 2026