Dynamics of sit-to-stand motions: effect of seat height, handle use and asymmetrical motions

Thomas, Robert; Causse, Julien; Wang, Xingmei

doi:10.1080/10255842.2011.594720

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…They suggest that, for the studied movement and population, measuring only the vertical force under the !# seat would allow a relatively correct estimation of all ECL and NJT: not only the values of R % were small (about 10% for the feet ECL and 20 % for the NJT), but the inuence of an experimental parameters (the Seat Height) was also correctly predicted. In this case, peak values of NJT and ECL increased when the seat height decreased, as observed from the experimental data (Robert et al, 2011). !…”

Section: Case Study: Cost Function and Applicabilitysupporting

confidence: 75%

Estimation of external contact loads using an inverse dynamics and optimization approach: General method and application to sit-to-stand maneuvers

Thomas

Causse

Monnier

2013

Journal of Biomechanics

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This paper presents a general method to estimate unmeasured external contact loads (ECLs) acting on a system whose kinematics and inertial properties are known. This method is dedicated to underdetermined problems, e.g. when the system has two or more unmeasured external contact wrenches. It is based on inverse dynamics and a quadratic optimization, and is therefore relatively simple, computationally cost effective and robust. Net joint loads (NJLs) are included as variables of the problem, and thus could be estimated in the same procedure as the ECL and be used within the cost function. The proposed method is tested on human sit-to-stand maneuvers performed holding a handle with one hand, i.e. asymmetrical movements with multiples external contacts. Three sets of measured and unmeasured contact load components and three cost functions are considered and simulated results are compared to experimental data. For the population and movement studied, better results are obtained for a least-square sharing between actuated degrees-of-freedom of the relative motor torques (motor torques normalized by the maximal torque production capacity). Moreover, the number of unknown ECL components does not significantly influence the results. In particular, measuring only the vertical force under the seat lead to a relatively correct estimation of the ECL and NJT: not only the values of R% were small (about 10% for the feet ECL and 20% for the NJT), but the influence of an experimental parameters (the Seat Height) was also correctly predicted.

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Section: Case Study: Cost Function and Applicabilitysupporting

confidence: 75%

Estimation of external contact loads using an inverse dynamics and optimization approach: General method and application to sit-to-stand maneuvers

Thomas

Causse

Monnier

2013

Journal of Biomechanics

Self Cite

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“…To evaluate the impact of using two thorax and abdomen segments rather than one torso segment, the joint moments at the LJC are computed during two repeated sit-to-stand movements of seven subjects (Robert et al 2011). The seat heights were set at 50% of the knee height leading to large flexion of the trunk.…”

Section: Application To Sit-to-stand Movementmentioning

confidence: 99%

Thorax and abdomen body segment inertial parameters adjusted from McConville et al. and Young et al.

Dumas

Robert

Chèze

et al. 2015

International Biomechanics

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Body segment inertial parameters (BSIPs) are essential in biomechanics and regressions, in particular scaling equations based on segment lengths, are one of the most practical methods to obtain them. Adjustment of the BSIPs from McConville et al. and Young et al. has been previously proposed to define BSIPs and segment lengths based on joint centres. However, due to the unavailable estimation of the thoracic joint centre, the trunk was previously segmented into two segments: pelvis and torso, restricting the possible applications to movements with limited flexion or bending of the trunk. This short communication presents an update of the adjustment procedure to obtain the BSIPs of the thorax and abdomen segments. The thoracic joint centre is obtained by interpolation based on literature data and allows the computation of the relevant abdomen and thorax segment coordinate systems and segment lengths. The updated scaling equations may be useful for researchers who would like to use the adjusted BSIPs with a more detailed trunk definition

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Knee Joint Biomechanics in Physiological Conditions and How Pathologies Can Affect It: A Systematic Review

Zhang

Liu

Han

et al. 2020

Applied Bionics and Biomechanics

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The knee joint, as the main lower limb motor joint, is the most vulnerable and susceptible joint. The knee injuries considerably impact the normal living ability and mental health of patients. Understanding the biomechanics of a normal and diseased knee joint is in urgent need for designing knee assistive devices and optimizing a rehabilitation exercise program. In this paper, we systematically searched electronic databases (from 2000 to November 2019) including ScienceDirect, Web of Science, PubMed, Google Scholar, and IEEE/IET Electronic Library for potentially relevant articles. After duplicates were removed and inclusion criteria applied to the titles, abstracts, and full text, 138 articles remained for review. The selected articles were divided into two groups to be analyzed. Firstly, the real movement of a normal knee joint and the normal knee biomechanics of four kinds of daily motions in the sagittal and coronal planes, which include normal walking, running, stair climbing, and sit-to-stand, were discussed and analyzed. Secondly, an overview of the current knowledge on the movement biomechanical effects of common knee musculoskeletal disorders and knee neurological disorders were provided. Finally, a discussion of the existing problems in the current studies and some recommendation for future research were presented. In general, this review reveals that there is no clear assessment about the biomechanics of normal and diseased knee joints at the current state of the art. The biomechanics properties could be significantly affected by knee musculoskeletal or neurological disorders. Deeper understanding of the biomechanics of the normal and diseased knee joint will still be an urgent need in the future.

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Dynamics of sit-to-stand motions: effect of seat height, handle use and asymmetrical motions

Cited by 4 publications

References 6 publications

Estimation of external contact loads using an inverse dynamics and optimization approach: General method and application to sit-to-stand maneuvers

Estimation of external contact loads using an inverse dynamics and optimization approach: General method and application to sit-to-stand maneuvers

Thorax and abdomen body segment inertial parameters adjusted from McConville et al. and Young et al.

Knee Joint Biomechanics in Physiological Conditions and How Pathologies Can Affect It: A Systematic Review

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