A new model for calculating muscle forces from electromyograms

Ruijven, L.J. van; Weijs, W.A.

doi:10.1007/bf00236071

Cited by 64 publications

(33 citation statements)

References 23 publications

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“…When the sarcomeres are at or below optimum length, estimated at 2.73 µm (van Ruijven and Weijs, 1990), they are negligible, but increase exponentially if they are stretched beyond this length. Apart from these passive forces, muscle stretch can, indirectly, cause reflexes, because it is detected by muscle receptors (Lund, 1991).…”

Section: Musclesmentioning

confidence: 99%

Dynamics of the Human Masticatory System

Koolstra

2002

Critical Reviews in Oral Biology & Medicine

198

109

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ABSTRACT:In this review, the movement characteristics of the human masticatory system are discussed from a biomechanical perspective. The discussion is based upon the three fundamental laws of mechanics applied to the various anatomical structures that are part of the masticatory system. An analysis of the forces and torques applied to the mandible by muscles, joints, articular capsules, and teeth is used to assess the determinants of jaw movement. The principle of relating the interplay of forces to the center of gravity of the lower jaw, in contrast to a hinge axis near its joints, is introduced. It is evident that the muscles are the dominant determinants of jaw movement. The contributions of the individual muscles to jaw movements can be derived from the orientation of their lines of action with respect to the center of gravity of the lower jaw. They cause the jaw to accelerate with six degrees of freedom. The ratio between linear and angular accelerations is subtly dependent on the mass and moments of inertia of the jaw, and the structures that are more or less rigidly attached to it. The effects of articular forces must be taken into account, especially if the joints are loaded asymmetrically. The muscles not only move the jaw but also maintain articular stability during midline movements. Passive structures, such as the ligaments, become dominant only when the jaw reaches its movement boundaries. These ligaments are assumed to prevent joint dislocation during non-midline movements.

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Section: Musclesmentioning

confidence: 99%

Dynamics of the Human Masticatory System

Koolstra

2002

Critical Reviews in Oral Biology & Medicine

198

109

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“…where e is defined as the elongation relative to the length of the muscle at rest when it is removed from the body, l ref is its optimum length, 46 S ref is the optimum length of the sarcomere (2.73 mm), 47 and l free and S free are the lengths of the muscle and of the sarcomere in a free state. The values of PCSA, l free and S free which depend on the type of muscle, were obtained from Van Eijden et al 46 The remaining factors were considered constants, being k the estimated force length stiffness (k = 3.34 N/cm 2 ) and a the passive force length asymptote (a = 0.7).…”

Section: Finite Element Modelmentioning

confidence: 99%

Clenching TMJs-Loads Increases in Partial Edentates: A 3D Finite Element Study

et al. 2008

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“…The muscles were modeled according to Van Ruijven and Weijs (van Ruijven and Weijs, 1990), which were in turn based on a Hill-type model (Hill, 1938):…”

Section: Mdamentioning

confidence: 99%

Predicting Skull Loading: Applying Multibody Dynamics Analysis to a Macaque Skull

Curtis

Kupczik

O’Higgins

et al. 2008

The Anatomical Record

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Evaluating stress and strain fields in anatomical structures is a way to test hypotheses that relate specific features of facial and skeletal morphology to mechanical loading. Engineering techniques such as finite element analysis are now commonly used to calculate stress and strain fields, but if we are to fully accept these methods we must be confident that the applied loading regimens are reasonable. Multibody dynamics analysis (MDA) is a relatively new three dimensional computer modeling technique that can be used to apply varying muscle forces to predict joint and bite forces during static and dynamic motions. The method ensures that equilibrium of the structure is maintained at all times, even for complex statically indeterminate problems, eliminating nonphysiological constraint conditions often seen with other approaches. This study describes the novel use of MDA to investigate the influence of different muscle representations on a macaque skull model (Macaca fascicularis), where muscle groups were represented by either a single, multiple, or wrapped muscle fibers. The impact of varying muscle representation on stress fields was assessed through additional finite element simulations. The MDA models highlighted that muscle forces varied with gape and that forces within individual muscle groups also varied; for example, the anterior strands of the superficial masseter were loaded to a greater extent than the posterior strands. The direction of the muscle force was altered when temporalis muscle wrapping was modeled, and was coupled with compressive contact forces applied to the frontal, parietal and temporal bones of the cranium during biting.

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A new model for calculating muscle forces from electromyograms

Cited by 64 publications

References 23 publications

Dynamics of the Human Masticatory System

Dynamics of the Human Masticatory System

Clenching TMJs-Loads Increases in Partial Edentates: A 3D Finite Element Study

Predicting Skull Loading: Applying Multibody Dynamics Analysis to a Macaque Skull

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