Sensitivity of a Hill-based muscle model to perturbations in model parameters

Scovil, Carol Y.; Ronsky, Janet L.

doi:10.1016/j.jbiomech.2005.06.005

Cited by 180 publications

(156 citation statements)

References 25 publications

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“…A FFS was constructed based on the mean kinematic data of each cat. We then examined the changes in the maximal directions of these FFSs due to perturbations of ±50% to all nonzero muscle moment arms, perturbations of ±50% to the maximum force value for each muscle, and 1° perturbations to each joint angle (cf., Lehman and Stark, 1982;Scovil and Ronsky, 2006). In addition, we tested the influence of an externally applied moment limit, the use of the pseudoinverse of the full seven degree of freedom system Jacobian (J T ) + , and of scaling individual segment lengths to match the kinematic data.…”

Section: Sensitivity Analysismentioning

confidence: 99%

Biomechanical capabilities influence postural control strategies in the cat hindlimb

McKay

Burkholder

Ting

2007

Journal of Biomechanics

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During postural responses to perturbations, horizontal plane forces generated by the cat hindlimb are stereotypically directed either towards or away from the animal's center of mass, independent of perturbation direction. We used a static, three-dimensional musculoskeletal model of the hindlimb to investigate possible biomechanical determinants of this "force constraint strategy" (Macpherson, 1988). We hypothesized that directions in which the hindlimb can produce large forces are preferentially used in postural control. We computed feasible force sets (FFS) based on hindlimb configurations of three cats during postural equilibrium tasks (Jacobs and Macpherson, 1996) and compared them to horizontal plane postural force directions. The grand mean FFS was bimodal, with maxima near the posterior-anterior axis (−86±8° and 71±4°), and minima near the medial-lateral axis (177±8° and 8±8°). Postural force directions clustered near both maxima; there were no medial postural forces near the absolute minimum. However, the medians of the anterior and posterior postural force direction histograms in the right hindlimb were rotated counterclockwise from the FFS maxima (p<0.05; Wilcoxon signed-rank test). Because the posterioranterior alignment of the FFS is consistent with a hindlimb structure optimized for locomotion, we conclude that the biomechanical capabilities of the hindlimb strongly influence, but do not uniquely determine the force directions observed in the force constraint strategy. Forces used in postural control may reflect a balance between a neural preference for using forces in the directions of large feasible forces and other criteria, such as the stabilization of the center of mass, and muscular coordination strategies.

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Section: Sensitivity Analysismentioning

confidence: 99%

Biomechanical capabilities influence postural control strategies in the cat hindlimb

McKay

Burkholder

Ting

2007

Journal of Biomechanics

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“…As a consequence the total ankle plantar flexion torque T = T 9 (θ A , ω A ) + T 10 (θ A , θ K , ω A , ω K ) where T 9 (θ A , ω A ) Note. Nomenclature and bounds based upon the following: maximum eccentric torque T max (N·m) (Dudley et al, 1990;Webber & Kriellers, 1997), maximum isometric torque T 0 (N·m) , maximum concentric velocity ω max (rad/s) , vertical asymptote (ω = -ω c ) ω c (rad/s) (UB- Scovil and Ronsky, 2006); (LB-Umberger et al, 2006), width of torque-angle relationship k 2 , optimum angle, θ opt (rad) (UB permitted outside joint range where curve may be ascending only), minimum muscle activation, a min , activation rate, m and point of inflection ω 1 (rad/s) (Amiridis et al, 1996) and moment arm ratio R (LB- Brindle et al, 2008), (UB-Grieve et al, 1978). No boundary values were met for the optimal set of parameters for the single joint and two joint solutions.…”

Section: Methodsmentioning

confidence: 99%

“…Typically these models are constructed using measurements sourced from a wide variety of experimental protocols, where the data may have come from animals, humans, in-vivo or in-vitro preparations, living participants or cadavers. Scovil and Ronsky (2006) have highlighted how perturbations to individual muscle model properties/parameters can introduce large errors to a simulation model.…”

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confidence: 99%

Are Joint Torque Models Limited by an Assumption of Monoarticularity?

Lewis

King²,

Yeadon³

et al. 2012

Journal of Applied Biomechanics

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This study determines whether maximal voluntary ankle plantar flexor torque could be more accurately represented using a torque generator that is a function of both knee and ankle kinematics. Isovelocity and isometric ankle plantar flexor torques were measured on a single participant for knee joint angles of 111° to 169° (approximately full extension) using a Contrex MJ dynamometer. Maximal voluntary torque was represented by a 19-parameter two-joint function of ankle and knee joint angles and angular velocities with the parameters determined by minimizing a weighted root mean square difference between measured torques and the two-joint function. The weighted root mean square difference between the two-joint function and the measured torques was 10 N-m or 3% of maximum torque. The two-joint function was a more accurate representation of maximal voluntary ankle plantar flexor torques than an existing single-joint function where differences of 19% of maximum torque were found. It is concluded that when the knee is flexed by more than 40°, a two-joint representation is necessary.

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“…Most of these models have a common limitation since they use the generic muscle architecture parameters reported in the literature to estimate muscle forces, such as to employ the average muscle architecture values collected from cadavers, ignoring the individual muscle architecture of the studied population, such as the older population (Pandy & Andriacchi, 2010). When used as parameters for it, the muscle architecture is capable of significantly changing the muscle model estimation of muscle force as well as that of the joint movements (Brand, Pedersen, & Friederich, 1986;Raikova & Prilutsky, 2001;Redl, Gfoehler, & Pandy, 2007;Scovil & Ronsky, 2006;Thelen, 2003). It is possible that the models (Arnold, et al, 2010;Delp et al, 1990) that were previously developed and validated for the estimation of muscle moment in young adults (Thelen, 2003) incorrectly estimate the muscle moment produced by older people.…”

Section: Introductionmentioning

confidence: 99%

Vastus lateralis muscle architecture to estimate knee extension moment of older individuals

Brodt

Geremia

Melo

et al. 2015

Motriz: rev. educ. fis.

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Abstract--The aim of this study was to compare the knee extension moment of older individuals with the muscle moment estimated through a biomechanical model. This was accomplished by using (1) the specific muscle architecture data of individuals, and (2) the generic muscle architecture available in the literature. The muscle force estimate was determined using a model with the muscle architecture from cadavers and the individual vastus lateralis muscle architecture of sixteen older volunteers. For the muscle moment comparison, all of the volunteers performed maximal voluntary isometric contractions (MVIC) in five different knee extension position angles. The architectural data was acquired using both resonance and ultrasound imaging. Both estimated muscle moments (generic and individual) were higher than the experimental. The architecture of the other vastii may be necessary to make the model more accurate for the older population. Although other factors inherent to ageing, such as co-contractions, fiber type percentage, and passive forces are not considered in the model, they could be responsible for the differences between moments in older people.Keywords: muscle architecture, muscle model, older individuals, moment Resumo--"Arquitetura do músculo vasto lateral para estimar o momento de extensão do joelho de indivíduos idosos." O objetivo deste estudo foi comparar o momento de extensão do joelho de idosos com momento muscular estimado por modelo biomecânico, utilizando (i) arquitetura muscular específica dos indivíduos e (II) arquitetura muscular genérica disponível na literatura. Para a estimativa da força muscular foi utilizado um modelo com a arquitetura muscular de cadáveres, e também com a arquitetura do vasto lateral de dezesseis voluntários idosos. Para a comparação todos voluntários realizaram contrações isométricas voluntárias máximas em cinco ângulos. Os dados de arquitetura foram adquiridos por meio de ultrassonografia e por ressonância magnética. Ambos os momentos estimados (genéricos e individuais) foram maiores do que experimental. A arquitetura dos outros músculos do quadríceps pode ser necessária para modelo ser mais preciso para a população idosa. Outros fatores inerentes ao envelhecimento não foram considerados no modelo, como cocontrações, tipagem de fibras e forças passivas, e devem ser responsáveis pelas diferenças entre os momentos.Palavras-chave: arquitetura muscular, modelo muscular, idosos, momento muscular Resumen--"Arquitectura de los vasto lateral para estimar el momento de la extensión de la rodilla de las personas ancianas." El objetivo de este estudio fue comparar el torque extensión de la rodilla de ancianos con torque muscular estimado por modelo biomecánico, usando (i) la arquitectura muscular específica de los individuos y (II) (II) la arquitectura muscular genérica disponible en la literatura. Para la estimación de la fuerza muscular se utilizó un modelo con arquitectura muscular de cadáveres, y también con la arquitectura del vasto lateral de dieciséis voluntarios ancianos....

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Sensitivity of a Hill-based muscle model to perturbations in model parameters

Cited by 180 publications

References 25 publications

Biomechanical capabilities influence postural control strategies in the cat hindlimb

Biomechanical capabilities influence postural control strategies in the cat hindlimb

Are Joint Torque Models Limited by an Assumption of Monoarticularity?

Vastus lateralis muscle architecture to estimate knee extension moment of older individuals

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