title: Evaluation of suitability of a micro-processing unit of motion analysis for upper limb tracking.
abstract: The aim of this study is to assess the suitability of a micro-processing unit of motion analysis (MPUMA), for monitoring, reproducing, and tracking upper limb movements. The MPUMA is based on an inertial measurement unit, a 16-bit digital signal controller and a customized algorithm. To validate the performance of the system, simultaneous recordings of the angular trajectory were performed with a video-based motion analysis system. A test of the flexo-extension of the shoulder joint during the active elevation in a complete range of 120º of the upper limb was carried out in 10 healthy volunteers. Additional tests were carried out to assess MPUMA performance during upper limb tracking. The first, a 3D motion reconstruction of three movements of the shoulder joint (flexo-extension, abduction-adduction, horizontal internal-external rotation), and the second, an upper limb tracking online during the execution of three movements of the shoulder joint followed by a continuous random movement without any restrictions by using a virtual model and a mechatronic device of the shoulder joint. Experimental results demonstrated that the MPUMA measured joint angles that are close to those from a motion-capture system with orientation RMS errors less than 3º.
authors.affiliation: The Electrical Engineering Department/Bioelectronics Section, Center for Research and Advanced Studies of the National Polytechnic Institute, Av. IPN 2508 Col. San Pedro Zacatenco, México D.F. C.P. 07360, Mexico. Electronic address: jbarraza@cinvestav.mx.
authors.forename: José Antonio
authors.initials: JA
authors.lastname: Barraza Madrigal
authors.affiliation: The Electrical Engineering Department/Bioelectronics Section, Center for Research and Advanced Studies of the National Polytechnic Institute, Av. IPN 2508 Col. San Pedro Zacatenco, México D.F. C.P. 07360, Mexico. Electronic address: ecardiel@cinvestav.mx.
authors.forename: Eladio
authors.initials: E
authors.lastname: Cardiel
authors.affiliation: The Electrical Engineering Department/Bioelectronics Section, Center for Research and Advanced Studies of the National Polytechnic Institute, Av. IPN 2508 Col. San Pedro Zacatenco, México D.F. C.P. 07360, Mexico. Electronic address: pablo.rogeli@cinvestav.mx.
authors.forename: Pablo
authors.initials: P
authors.lastname: Rogeli
authors.affiliation: The Electrical Engineering Department/Bioelectronics Section, Center for Research and Advanced Studies of the National Polytechnic Institute, Av. IPN 2508 Col. San Pedro Zacatenco, México D.F. C.P. 07360, Mexico. Electronic address: lleija@cinvestav.mx.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Leija Salas
authors.affiliation: The Electrical Engineering Department/Bioelectronics Section, Center for Research and Advanced Studies of the National Polytechnic Institute, Av. IPN 2508 Col. San Pedro Zacatenco, México D.F. C.P. 07360, Mexico. Electronic address: rmunoz@cinvestav.mx.
authors.forename: Roberto
authors.initials: R
authors.lastname: Muñoz Guerrero
mesh_terms: D000465:Algorithms; D005240:Feasibility Studies; D006801:Humans; D008991:Monitoring, Physiologic / Q000379:methods*; D009068:Movement; D016059:Range of Motion, Articular; D034941:Upper Extremity / Q000502:physiology*
keywords: Human body tracking; Inertial measurement unit; Motion analysis system; Rehabilitation; Upper limb