A simplified model for whole-body angular momentum calculation. (January 2023)

• Record Type: Journal Article
• Authors: Liu, Ming; Naseri, Amirreza; Lee, I-Chieh; Hu, Xiaogang; Lewek, Michael D.; Huang, He
• Is Part Of: Medical engineering & physics. Volume 111(2023)
• Publication Date: 2023-01
• Subjects: Angular momentum -- Gait stability -- Wearable system -- Rigid body model; IMU inertial measurement units -- Lbody whole-body angular momentum -- BMO bias between the merged segment and the original proximal segment -- COM center of mass -- MOS margin of stability -- Ls angular momentum of a given segment -- Im moment of inertia of the merged segment -- dmr COM of the merged segment -- ∠α merging angle -- ∠β incline angle; Biomedical engineering -- Periodicals; Biomedical Engineering -- Periodicals; Physics -- Periodicals; Génie biomédical -- Périodiques; Biomedical engineering; Electronic journals; Periodicals; 610.28
• DOI: 10.1016/j.medengphy.2022.103944
• Languages: English
• ISSNs: 1350-4533

Abstract

Highlights: A simplified rigid body model to calculation of full body angular momentum. Only 7 IMU sensors are needed to calculate the full body angular momentum using this simplified model. The model was validated on both able-bodied subjects and transfemoral amputees. Abstract: The capability to monitor gait stability during everyday life could provide key information to guide clinical intervention to patients with lower limb disabilities. Whole body angular momentum ( Lbody ) is a convenient stability indicator for wearable motion capture systems. However, Lbody is costly to estimate, because it requires monitoring all major body segment using expensive sensor elements. In this study, we developed a simplified rigid body model by merging connected body segments to reduce the number of body segments, which need to be monitored. We demonstrated that the Lbody could be estimated by a seven-segment model accurately for both people with and without lower extremity amputation.