Changes in inertial parameters of the lower limb during the impact phase of dynamic tasks
| Autor: | Matthew T.G. Pain, Laura-Anne M. Furlong, Dimitrios Voukelatos, Pui Wah Kong |
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| Rok vydání: | 2019 |
| Předmět: |
Male
Motion analysis Inertial frame of reference Movement 0206 medical engineering Biomedical Engineering Biophysics Phase (waves) 02 engineering and technology Models Biological 03 medical and health sciences 0302 clinical medicine Humans Orthopedics and Sports Medicine Mechanical Phenomena Physics Inverse kinematics Delaunay triangulation Rehabilitation Dynamics (mechanics) Mechanics Moment of inertia Rigid body 020601 biomedical engineering Biomechanical Phenomena Lower Extremity 030217 neurology & neurosurgery Algorithms |
| Zdroj: | Journal of biomechanics. 99 |
| ISSN: | 1873-2380 |
| Popis: | Mechanical analysis at the whole human body level typically assumes limbs are rigid bodies with fixed inertial parameters, however, as the human body consists mainly of deformable soft tissue, this is not the case. The aim of this study was to investigate changes in the inertial parameters of the lower limb during landing and stamping tasks using high frequency three-dimensional motion analysis. Seven males performed active and passive drop landings from 30 and 45 cm and a stamp onto a force plate. A sixteen-camera 750 Hz Vicon system recorded markers for standard rigid body analysis using inverse kinematics in Visual 3D and 7 × 8 and 7 × 9 marker arrays on the shank and thigh. Frame by frame segment volumes from marker arrays were calculated as a collection of tetrahedra using the Delaunay triangulation method in 3D and further inertial parameters were calculated using the method of Tonon (2004). Distance between the centres of mass (COM) of the rigid and soft tissues changed during impact in a structured manner indicative of a damped oscillation. Group mean amplitudes for COM motion of the soft tissues relative to the rigid body of up to 1.4 cm, and changes of up to 17% in moment of inertia of the soft tissue about the rigid body COM were found. This study has shown that meaningful changes in inertial parameters can be observed and quantified during even moderate impacts. Further examination of the effects these could have on movement dynamics and energetics seems pertinent. |
| Databáze: | OpenAIRE |
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