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dc.contributor.authorKoopman, A.S.
dc.contributor.authorKingma, I
dc.contributor.authorFaber, G.S.
dc.contributor.authorBornmann, J
dc.contributor.authorvan Dieën, J.H.
dc.date.accessioned2018-02-22T08:11:02Z
dc.date.available2018-02-22T08:11:02Z
dc.date.issued2017-10-12
dc.identifier.urihttp://hdl.handle.net/1871/55592
dc.description.abstractMechanical loading of the spine has been shown to be an important risk factor for the development of low-back pain. Inertial motion capture (IMC) systems might allow measuring lumbar moments in realistic working conditions, and thus support evaluation of measures to reduce mechanical loading. As the number of sensors limits applicability, the objective of this study was to investigate the effect of the number of sensors on estimates of L5S1 moments. Hand forces, ground reaction forces (GRF) and full-body kinematics were measured using a gold standard (GS) laboratory setup. In the ambulatory setup, hand forces were estimated based on the force plates measured GRF and body kinematics that were measured using (subsets of) an IMC system. Using top-down inverse dynamics, L5S1 flexion/extension moments were calculated. RMSerrors (Nm) were lowest (16.6) with the full set of 17 sensors and increased to 20.5, 22 and 30.6, for 8, 6 and 4 sensors. Absolute errors in peak moments (Nm) ranged from 17.7 to 16.4, 16.9 and 49.3 Nm, for IMC setup’s with 17, 8, 6 and 4 sensors, respectively. When horizontal GRF were neglected for 6 sensors, RMSerrors and peak moment errors decreased from 22 to 17.3 and from 16.9 to 13 Nm, respectively. In conclusion, while reasonable moment estimates can be obtained with 6 sensors, omitting the forearm sensors led to unacceptable errors. Furthermore, vertical GRF information is sufficient to estimate L5S1 moments in lifting.en_US
dc.description.sponsorshipThe authors thank Mr. Jacob Banks and Mr. Niall O’Brien at Liberty Mutual Research Institute for Safety for assistance during data collection. This work was supported by the European Union’s Horizon 2020 through the SPEXOR project, contract no. 687662 and partly by the Liberty Mutual - Harvard T.H. Chan School of Public Health postdoctoral program.en_US
dc.language.isoen_USen_US
dc.publisherElsevieren_US
dc.subjectLow-back painen_US
dc.subjectMechanical loadingen_US
dc.subjectAmbulatory measurmentsen_US
dc.subjectInertial sensors & vertical ground reaction forcesen_US
dc.titleEstimating the L5S1 flexion/extension moment in symmetrical lifting using a simplified ambulatory measurement system.en_US
dc.typeArticleen_US


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