Determination of joint moments with instrumented force shoes in a variety of tasks |
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| Authors: | Gert S. Faber Idsart Kingma H. Martin Schepers Peter H. Veltink Jaap H. van Dieën |
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| Affiliation: | 1. Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands;2. Institute for Biomedical Technology and Technical Medicine (MIRA), P.O. Box 217, 7500 AE Enschede, The Netherlands;1. Department of Industrial Engineering and Management, Ben-Gurion University of the Negev, Beer Sheva, Israel;2. Institute of Agricultural Engineering, Agricultural Research Organization, Bet Dagan, Israel;1. Division of Applied Mechanics, Department of Mechanical Engineering, École Polytechnique, Montréal, Québec, Canada;2. Institut de recherche Robert Sauvé en santé et en sécurité du travail, Montréal, Québec, Canada;1. Division of Applied Mechanics, Department of Mechanical Engineering, École Polytechnique, Montréal, Québec, Canada;2. Institut de recherche Robert Sauvé en santé et en sécurité du travail, Montréal, Québec, Canada;1. Department of Mechanical and Materials Engineering, Queen''s University, Kingston, Ontario, Canada;2. School of Kinesiology and Health Studies, Queen''s University, Kingston, Ontario, Canada;3. Institut de Recherche Robert-Sauvé en Santé et en Sécurité Du Travail, Montréal, Québec, Canada |
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| Abstract: | Ground reaction forces (GRFs) are often used in inverse dynamics analyses to determine joint loading. These GRFs are usually measured using force plates (FPs). As an alternative, instrumented force shoes (FSs) can be used, which have the advantage over FPs that they do not constrain foot placement. This study tested the FS system in one normal weight subject (77 kg) performing 19 different lifting, pushing and pulling and walking tasks. Kinematics were measured with an optoelectronic system and the GRFs and the positions of the centre of pressure (CoP) were synchronously measured with FPs and FSs. Differences between the outcomes of the two measurement systems (i.e. CoP and GRFs) and the resulting ankle and L5/S1 joint moments were determined at the instant of the peak GRF (DaPF). For most lifting and pushing and pulling tasks, the difference between the FP and FS measurements remained small: GRF DaPF remained below 3% body weight, CoP DaPF remained below 10 mm, ankle moment DaPF remained below 7% of the peak total ankle moment that occurred during normal walking and L5/S1 moment DaPF remained below 7% of the peak total L5/S1 moment that occurred during normal symmetric lifting. More substantial differences were only found in the maximal pushing tasks. For the walking tasks, peak vertical GRFs were somewhat underestimated. However, differences in ankle and L5/S1 moments remained small, i.e. DaPF below 7% of the peak total moment that occurred during normal walking. |
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