A comparison between a new model and current models for estimating trunk segment inertial parameters |
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| Authors: | Jason Wicke Genevieve A Dumas Patrick A Costigan |
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| Institution: | 1. Human Motion Research Laboratory, Department of Health & Human Performance, Texas A&M—Commerce University, Commerce, TX 75402, USA;2. Department of Mechanical and Materials Engineering, Queen''s University, Kingston, Ont., Canada K7L 3N6;3. School of Kinesiology and Health Studies, Queen''s University, Kingston, Ont., Canada K7L 3N6;1. Department of Sport and Exercise Science, Aberystwyth University, United Kingdom;2. Biomechanics Laboratory, Department of Kinesiology, The Pennsylvania State University, USA;3. School of Sport and Exercise Sciences, University of Kent, United Kingdom;1. Faculty of Physical Education and Sport Sciences, Hakim Sabzevari University, Sabzevar, Iran;3. CURAPS-DIMPS, Faculté des Sciences de l’Homme et de l’Environnement, Université de la Réunion, Le Tampon, France;4. Department of Exercise Science and Sport, University of Scranton, PA, USA;6. Department of Orthopedic Surgery, Sainte-Justine Hospital, Montreal, QC, Canada;1. Department of Human Movement Sciences, Faculty of Behaviour and Movement Sciences, Vrije Universiteit Amsterdam, MOVE Research Institute Amsterdam, The Netherlands;2. Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA, USA;3. Liberty Mutual Research Institute for Safety, Hopkinton, MA, USA;4. Department of Industrial Engineering & Engineering Management National Tsing Hua University, Taiwan, ROC;5. Department of Physical Therapy, Movement, and Rehabilitation Sciences, Northeastern University, Boston, MA, USA;1. Department of Mechanical and Manufacturing Engineering, Aalborg University, 9220 Aalborg East, Denmark;2. Department of Health Science and Technology, Aalborg University, 9220 Aalborg East, Denmark |
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| Abstract: | Modeling of the body segments to estimate segment inertial parameters is required in the kinetic analysis of human motion. A new geometric model for the trunk has been developed that uses various cross-sectional shapes to estimate segment volume and adopts a non-uniform density function that is gender-specific. The goal of this study was to test the accuracy of the new model for estimating the trunk's inertial parameters by comparing it to the more current models used in biomechanical research. Trunk inertial parameters estimated from dual X-ray absorptiometry (DXA) were used as the standard. Twenty-five female and 24 male college-aged participants were recruited for the study. Comparisons of the new model to the accepted models were accomplished by determining the error between the models’ trunk inertial estimates and that from DXA. Results showed that the new model was more accurate across all inertial estimates than the other models. The new model had errors within 6.0% for both genders, whereas the other models had higher average errors ranging from 10% to over 50% and were much more inconsistent between the genders. In addition, there was little consistency in the level of accuracy for the other models when estimating the different inertial parameters. These results suggest that the new model provides more accurate and consistent trunk inertial estimates than the other models for both female and male college-aged individuals. However, similar studies need to be performed using other populations, such as elderly or individuals from a distinct morphology (e.g. obese). In addition, the effect of using different models on the outcome of kinetic parameters, such as joint moments and forces needs to be assessed. |
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