Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"muscle forces"”.
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Ihh Signaling and Muscle Forces are Required for Enthesis Development
… tendon enthesis development in the absence of muscle forces. This localized paralysis model resulted in joint level deformities and mineralization defects. We observed a dramatic decrease in the enthesis biomechanical properties accompanied by structural and compositional changes. Collagen …
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Coordinate system dependence of muscle forces predicted using optimization methods in musculoskeletal joints
… methods are widely used to predict in-vivo muscle forces in musculoskeletal joints. Moment equilibrium at the joint center (usually defined as the origin of the joint coordinate system) has been used as a constraint condition for optimization procedures and the joint reaction moments were …
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Computational optimization methods for modeling the effect of muscle forces on bone strength adaptation
… of a targeted bone within a multibone, multimuscle system are developed and implemented in this work. Through a more detailed representation of the system in which the bone acts and the creation of a model that does not require experimentally based parameters, the developed techniques …
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Influence of Thigh Muscle Forces on Anterior Cruciate Ligament Forces during Single-Leg Landing from Three Different Heights
… spent on the ACL annually. While the quadriceps muscle produces an anterior shear force on the tibia that causes the ACL to strain, the hamstrings muscle can protect the ACL by producing a posterior shear force to the tibia reducing the strain. When the hamstrings contract simultaneously with the …
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The Roles of the Normal Mechanical Properties of Articular Cartilage in the Contact Mechanics of the Human Knee Joint: a Finite Element Approach
… were modeled. Moreover, the effect of individual muscle forces on the knee joint mechanics was investigated. In one of our studies, four models including healthy and degenerated cartilage with local OA progressed from the superficial, to the middle and deep zones were compared. In another study, …
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Experimental and Simulation Based Dynamic Assessment of Flexion and Extension Movements of Torso
… tasks involving dynamic trunk movements, muscle fatigue, and spinal instability are identified as major risk factors for developing low back pain. Dynamic stability and muscle forces during trunk flexion-extension movements are studied in this dissertation. Torso muscle fatigue is known to …
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An examination of age-related differences in lower extremity joint torques and strains in the proximal femur during gait
… age-related decreases in bone mineral density, muscles and motor control are altered by aging as well. Muscles forces in vivo are thought to have a prophylactic effect that can reduce shear and bending in the femur. This is beneficial because bone is stronger in compression than in shear or …
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Muscle force estimation in clinical gait analysis
… influence the skeletal system through muscle force production is needed. Clinical gait analysis lacks in a sufficient estimation of individual muscle forces. To date, joint moments and EMG measurements are used to deduce on the characteristics of muscle forces, however, known …
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The effects of perturbation frequency, magnitude, and uncertainty during static and dynamic tracking on the estimated level of muscle co-contraction
… investigate the predictability of antagonistic muscle forces during static and dynamic tracking tasks with perturbations. In the first experiment, perturbations to the isometric tracking were effected by sudden momentary changes in the gain. In the second experiment, perturbations to the …
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Biomechanical analysis of asymmetric and dynamic lifting task
… back disorders (LBD). Aimed at deriving internal forces of human musculoskeletal system during lifting, biomechanical models are utilized to address this problem. This thesis provides an indepth literature review of such modeling, and the results of experiments used to address LBD issues. An …
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Musculoskeletal Modeling of The Human Elbow Joint
… Currently, in vivo measurements of ligament, and muscle forces, and cartilage contact pressures during elbow activities is not possible. Therefore, computational models needs to be employed for prediction. A dynamic computational model in which muscle, ligament and articular surface contact forces …
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Optimization-based biomechanical evaluation of isometric exertions on a brake wheel
… three-dimensional body posture and resultant forces at the hands for analysis by the model. The model resolved the external forces acting on the body to a resultant moment about L3/L4 and then employed an optimization algorithm to estimate the internal lumbar muscle forces generated to resist …
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Biomechanical simulation of virtual physiological humans : modeling of musculoskeletal kinematic and dynamic redundancy using coordinate projection methods
… The assessment of the internal state (e.g., muscle forces and joint reaction loads) from those measurements does not lead to a unique solution, due to the inherit redundancy of the musculoskeletal system. More specifically, there are more degrees of freedom than those required to perform …
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Construction and assessment of a computer graphics-based model for wheelchair propulsion
… analyses involving kinetics, kinematics, and muscle mechanics provide an opportunity to identify modifiable risk factors associated with wheelchair propulsion and upper limb overuse injuries that may be used toward developing prevention and treatment interventions. However, these analyses are …
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Multiscale Musculoskeletal Modeling of the Lower Limb to Perform Personalized Simulations of Movement
… internal parameters of the human body, such as muscle forces, are not safely measurable in vivo and, consequently, a thorough comparison between model outputs and experimental measurements is not always possible. <em>Personalization</em> is an additional issue because the inherent variability …
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The role of neuromuscular performance on bone strength and properties in the forearm and lower leg of children
Introduction: The role of muscle forces in determining bone micro-architecture and strength in children is poorly understood as limited evidence relies on surrogate measures of muscle force such as muscle size. The objective of this thesis was to explore the role of muscle area, peak forces from …
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Prediction of knee loading in native knee and total knee arthroplasty : a forward dynamics computational study
… to experimentally measured in vivo knee contact forces, in order to study the biomechanical consequences of two different total knee arthroplasty designs. The two main contributions of this dissertation are: (1) Corroboration to experimental data: The development of an EMG-driven, full-body, …
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THE BIOMECHANICAL ASSESSMENT OF TAI CHI CHUAN MOVEMENT AND IMPLICATION IN REHABILITATION EXERCISE
… of TCC on lower limb biomechanics, balance, and muscle strength either in the healthy or patient conditions; the initial results have shown that TCC is good for some specific patient groups. However, these studies have some limitations such as single-gender and some studies had a small sample …
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Bio-mechanical characterisation of synergistic muscle control in goal directed movements
… movement requires the coordinated activation of muscles to produce precise muscle forces and joint torques. The co-ordination of muscles, acting on multi-joint limbs and characterised by highly non-linear dynamics, requires significant computational effort. The synergistic control hypothesis …
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