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The paper describes a novel data fusion algorithm using algebraic operations in vector space, the deployment of the system using three Kinect units, provides analysis of dynamic characteristics (position of joints, speed of movement, functional working envelope, body asymmetry and the rate of fatigue) of human motion during physical exercising, and evaluates intra-session reliability of the system using test\u2013retest reliability metrics (intra-class correlation, coefficient of variation and coefficient of determination). Comparison of multi-Kinect system vs single-Kinect system shows an improvement in accuracy of 15.7%, while intra-session reliability is rated as excellent.<\/jats:p>","DOI":"10.1186\/s13673-020-00256-4","type":"journal-article","created":{"date-parts":[[2020,12,14]],"date-time":"2020-12-14T19:02:56Z","timestamp":1607972576000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":68,"title":["Multiple Kinect based system to monitor and analyze key performance indicators of physical training"],"prefix":"10.1186","volume":"10","author":[{"given":"Karolis","family":"Ryselis","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tautvydas","family":"Petkus","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomas","family":"Bla\u017eauskas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rytis","family":"Maskeli\u016bnas","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9990-1084","authenticated-orcid":false,"given":"Robertas","family":"Dama\u0161evi\u010dius","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,12,14]]},"reference":[{"key":"256_CR1","doi-asserted-by":"publisher","first-page":"307","DOI":"10.2307\/2987937","volume":"32","author":"DG Altman","year":"1983","unstructured":"Altman DG, Bland JM (1983) Measurement in medicine: the analysis of method comparison studies. 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