Comparison between model-based and measured force polytopes: towards isometric force capacity evaluation

Rezzoug, Nasser; Hernandez, Vincent; Jacquier-Bret, Julien; Gorce, Philippe

doi:10.1080/10255842.2013.815972

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The cost functions should be adapted to consider the polytopes geometry. The method was tested in silico and will be validated experimentally using a similar protocol for force polytopes measurements as in (Rezzoug et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Simulated Increase in Monoarticular Hip Muscle Strength Reduces the First Peak of Knee Compression Forces During Walking

Jolas,

Simonsen,

Andersen

2023

Journal of Biomechanical Engineering

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Reducing compressive knee contact forces (KCF) during walking could slow the progression of knee osteoarthritis. A previous study has shown that compensating for the hip flexion/extension moment could reduce the KCF peak occurring during early-stance (KCFp1). Therefore, this study aimed to identify if monoarticular hip muscle could allow this compensation while considering different walking strategies. Gait trials from 24 healthy participants were used to make musculoskeletal models. Five load-cases were examined: (I) Normal, (II) with an applied external moment compensating for the hip flexion/extension moment, (III-V) three conditions with isolated/combined 30% increase of isometric strength of gluteus medius and maximus. KCF, hip muscle forces, and joint moments were computed. A cluster analysis of the Normal condition was performed with hip and knee flexion/extension moment during KCFp1 as input to examine the influence of walking strategies. The cluster analysis revealed two groups having different hip and knee moments in early-stance [p<0.01]. The reduction in KCFp1 from the normal condition, although present in both groups, was greater for the group with the highest hip and lowest knee flexion/extension moments for all conditions (II: -6.03% versus -21.82% [p<0.001], III: -3.21% versus -1.59%, IV: -3.00% versus -1.76%, V: -6.12 versus -3.09%). This reduction in KCFp1 occurred through a shift in force developed by the hamstrings to the gluteus medius and maximus. Differences between groups suggest that this reduction depends on the walking strategy.

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Section: Discussionmentioning

confidence: 99%

Simulated Increase in Monoarticular Hip Muscle Strength Reduces the First Peak of Knee Compression Forces During Walking

Jolas,

Simonsen,

Andersen

2023

Journal of Biomechanical Engineering

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“…For different elbow flexion values, a comparison between FFS predictions with FE, SFE, FP and SFP was done, but no ground truth measures of maximal forces exerted at the hand was proposed [23]. Additionally, some preliminary results on one subject with both joint torques and 3D force measurements were provided in [24]. In this framework, one purpose of the present study was to evaluate the four models of FFS (FE, SFE, FP and SFP) from recordings of human upper-limb posture and maximum joint torques with a dedicated dynamometer.…”

Section: Introductionmentioning

confidence: 99%

Upper-Limb Isometric Force Feasible Set: Evaluation of Joint Torque-Based Models

2021

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A force capacity evaluation for a given posture may provide better understanding of human motor abilities for applications in sport sciences, rehabilitation and ergonomics. From data on posture and maximum isometric joint torques, the upper-limb force feasible set of the hand was predicted by four models called force ellipsoid, scaled force ellipsoid, force polytope and scaled force polytope, which were compared with a measured force polytope. The volume, shape and force prediction errors were assessed. The scaled ellipsoid underestimated the maximal mean force, and the scaled polytope overestimated it. The scaled force ellipsoid underestimated the volume of the measured force distribution, whereas that of the scaled polytope was not significantly different from the measured distribution but exhibited larger variability. All the models characterized well the elongated shape of the measured force distribution. The angles between the main axes of the modelled ellipsoids and polytopes and that of the measured polytope were compared. The values ranged from 7.3° to 14.3°. Over the entire surface of the force ellipsoid, 39.7% of the points had prediction errors less than 50 N; 33.6% had errors between 50 and 100 N; and 26.8% had errors greater than 100 N. For the force polytope, the percentages were 56.2%, 28.3% and 15.4%, respectively.

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Toward isometric force capabilities evaluation by using a musculoskeletal model: Comparison with direct force measurement

Hernandez

Rezzoug

Gorce

2015

Journal of Biomechanics

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Comparison between model-based and measured force polytopes: towards isometric force capacity evaluation

Abstract: To cite this article: N. Rezzoug, V. Hernandez, J. Jacquier-Bret & P. Gorce (2013) Comparison between model-based and measured force polytopes: towards isometric force capacity evaluation,

Cited by 3 publications

References 6 publications

Simulated Increase in Monoarticular Hip Muscle Strength Reduces the First Peak of Knee Compression Forces During Walking

Simulated Increase in Monoarticular Hip Muscle Strength Reduces the First Peak of Knee Compression Forces During Walking

Upper-Limb Isometric Force Feasible Set: Evaluation of Joint Torque-Based Models

Toward isometric force capabilities evaluation by using a musculoskeletal model: Comparison with direct force measurement

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