{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T21:45:12Z","timestamp":1768340712805,"version":"3.49.0"},"reference-count":47,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2022,3,26]],"date-time":"2022-03-26T00:00:00Z","timestamp":1648252800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Union\u00b4s Horizon 2020 (Marie Skolowska-Curie)","award":["823871"],"award-info":[{"award-number":["823871"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.3390\/s22072552","type":"journal-article","created":{"date-parts":[[2022,3,27]],"date-time":"2022-03-27T21:31:25Z","timestamp":1648416685000},"page":"2552","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["The Validity of the Energy Expenditure Criteria Based on Open Source Code through two Inertial Sensors"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6143-6703","authenticated-orcid":false,"given":"Jaime","family":"Mart\u00edn-Mart\u00edn","sequence":"first","affiliation":[{"name":"Biomedical Research Institute of M\u00e1laga (IBIMA), 29010 M\u00e1laga, Spain"},{"name":"Legal and Forensic Medicine Area, Department of Human Anatomy, Legal Medicine and History of Science, Faculty of Medicine, University of M\u00e1laga, 29071 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Li","family":"Wang","sequence":"additional","affiliation":[{"name":"Faculty of Media and Communication, Bournemouth University, Bournemouth BH12 5BB, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Irene","family":"De-Torres","sequence":"additional","affiliation":[{"name":"Biomedical Research Institute of M\u00e1laga (IBIMA), 29010 M\u00e1laga, Spain"},{"name":"Physical Medicine and Rehabilitation Unit, Regional Universitary Hospital of M\u00e1laga, 29010 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4402-6483","authenticated-orcid":false,"given":"Adrian","family":"Escriche-Escuder","sequence":"additional","affiliation":[{"name":"Biomedical Research Institute of M\u00e1laga (IBIMA), 29010 M\u00e1laga, Spain"},{"name":"Department of Physiotherapy, University of M\u00e1laga, 29071 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3993-5092","authenticated-orcid":false,"given":"Manuel","family":"Gonz\u00e1lez-S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Biomedical Research Institute of M\u00e1laga (IBIMA), 29010 M\u00e1laga, Spain"},{"name":"Department of Physiotherapy, University of M\u00e1laga, 29071 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Antonio","family":"Muro-Culebras","sequence":"additional","affiliation":[{"name":"Biomedical Research Institute of M\u00e1laga (IBIMA), 29010 M\u00e1laga, Spain"},{"name":"Department of Physiotherapy, University of M\u00e1laga, 29071 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7355-9740","authenticated-orcid":false,"given":"Cristina","family":"Rold\u00e1n-Jim\u00e9nez","sequence":"additional","affiliation":[{"name":"Biomedical Research Institute 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