The Experts below are selected from a list of 48 Experts worldwide ranked by ideXlab platform

AntÔnio P. L. Bo - One of the best experts on this subject based on the ideXlab platform.

  • Exploring Peripheral Mechanism of Tremor on Neuromusculoskeletal Model: A General Simulation Study
    IEEE Transactions on Biomedical Engineering, 2009
    Co-Authors: Dingguo Zhang*, Philippe Poignet, AntÔnio P. L. Bo
    Abstract:

    This paper provides a general simulation study on tremor based on a modular neuromusculoskeletal Model. It focuses on the peripheral mechanism. It is known that the reflex loops in the peripheral nervous system have influences on the tremor. A neuromusculoskeletal Model with several reflex loops is developed to explore the dynamics of tremor. The Muscle Model is derived from a Hill-Type Muscle Model. The reflex loops include the spindle organ, Golgi tendon organ, and Renshaw cell. Their effects are investigated quantitatively in detail. A two-Muscle (agonist/antagonist) system with interaction is further studied. Moreover, a Model in combination with the central oscillation and peripheral system is developed. Some results are in accordance with the previous research, whereas some new findings are proposed according to the simulation study.

Syn Schmitt - One of the best experts on this subject based on the ideXlab platform.

  • implementation and validation of the extended hill type Muscle Model with robust routing capabilities in ls dyna for active human body Models
    Biomedical Engineering Online, 2017
    Co-Authors: Christian Kleinbach, Oleksandr Martynenko, Janik Promies, Daniel F B Haeufle, Jorg Fehr, Syn Schmitt
    Abstract:

    Background In the state of the art finite element AHBMs for car crash analysis in the LS-DYNA software material named *MAT_Muscle (*MAT_156) is used for active Muscles Modeling. It has three elements in parallel configuration, which has several major drawbacks: restraint approximation of the physical reality, complicated parameterization and absence of the integrated activation dynamics. This study presents implementation of the extended four element Hill-Type Muscle Model with serial damping and eccentric force–velocity relation including \(Ca^{2+}\) dependent activation dynamics and internal method for physiological Muscle routing.

  • hill type Muscle Model with serial damping and eccentric force velocity relation
    Journal of Biomechanics, 2014
    Co-Authors: Daniel F B Haeufle, Michael Gunther, Alexandra Bayer, Syn Schmitt
    Abstract:

    Abstract Hill-Type Muscle Models are commonly used in biomechanical simulations to predict passive and active Muscle forces. Here, a Model is presented which consists of four elements: a contractile element with force–length and force–velocity relations for concentric and eccentric contractions, a parallel elastic element, a series elastic element, and a serial damping element. With this, it combines previously published effects relevant for muscular contraction, i.e. serial damping and eccentric force–velocity relation. The Model is exemplarily applied to arm movements. The more realistic representation of the eccentric force–velocity relation results in human-like elbow-joint flexion. The Model is provided as ready to use Matlab ® and Simulink ® code.

Lena H Ting - One of the best experts on this subject based on the ideXlab platform.

  • contribution of Muscle short range stiffness to initial changes in joint kinetics and kinematics during perturbations to standing balance a simulation study
    Journal of Biomechanics, 2017
    Co-Authors: Friedl De Groote, Jessica L Allen, Lena H Ting
    Abstract:

    Simulating realistic musculoskeletal dynamics is critical to understanding neural control of Muscle activity evoked in sensorimotor feedback responses that have inherent neural transmission delays. Thus, the initial mechanical response of Muscles to perturbations in the absence of any change in Muscle activity determines which corrective neural responses are required to stabilize body posture. Muscle short-range stiffness, a history-dependent property of Muscle that causes a rapid and transient rise in Muscle force upon stretch, likely affects musculoskeletal dynamics in the initial mechanical response to perturbations. Here we identified the contributions of short-range stiffness to joint torques and angles in the initial mechanical response to support surface translations using dynamic simulation. We developed a dynamic Model of Muscle short-range stiffness to augment a Hill-Type Muscle Model. Our simulations show that short-range stiffness can provide stability against external perturbations during the neuromechanical response delay. Assuming constant Muscle activation during the initial mechanical response, including Muscle short-range stiffness was necessary to account for the rapid rise in experimental sagittal plane knee and hip joint torques that occurs simultaneously with very small changes in joint angles and reduced root mean square errors between simulated and experimental torques by 56% and 47%, respectively. Moreover, forward simulations lacking short-range stiffness produced unreasonably large joint angle changes during the initial response. Using Muscle Models accounting for short-range stiffness along with other aspects of history-dependent Muscle dynamics may be important to advance our ability to simulate inherently unstable human movements based on principles of neural control and biomechanics.

Dingguo Zhang* - One of the best experts on this subject based on the ideXlab platform.

  • Exploring Peripheral Mechanism of Tremor on Neuromusculoskeletal Model: A General Simulation Study
    IEEE Transactions on Biomedical Engineering, 2009
    Co-Authors: Dingguo Zhang*, Philippe Poignet, AntÔnio P. L. Bo
    Abstract:

    This paper provides a general simulation study on tremor based on a modular neuromusculoskeletal Model. It focuses on the peripheral mechanism. It is known that the reflex loops in the peripheral nervous system have influences on the tremor. A neuromusculoskeletal Model with several reflex loops is developed to explore the dynamics of tremor. The Muscle Model is derived from a Hill-Type Muscle Model. The reflex loops include the spindle organ, Golgi tendon organ, and Renshaw cell. Their effects are investigated quantitatively in detail. A two-Muscle (agonist/antagonist) system with interaction is further studied. Moreover, a Model in combination with the central oscillation and peripheral system is developed. Some results are in accordance with the previous research, whereas some new findings are proposed according to the simulation study.

Philippe Poignet - One of the best experts on this subject based on the ideXlab platform.

  • Exploring Peripheral Mechanism of Tremor on Neuromusculoskeletal Model: A General Simulation Study
    IEEE Transactions on Biomedical Engineering, 2009
    Co-Authors: Dingguo Zhang*, Philippe Poignet, AntÔnio P. L. Bo
    Abstract:

    This paper provides a general simulation study on tremor based on a modular neuromusculoskeletal Model. It focuses on the peripheral mechanism. It is known that the reflex loops in the peripheral nervous system have influences on the tremor. A neuromusculoskeletal Model with several reflex loops is developed to explore the dynamics of tremor. The Muscle Model is derived from a Hill-Type Muscle Model. The reflex loops include the spindle organ, Golgi tendon organ, and Renshaw cell. Their effects are investigated quantitatively in detail. A two-Muscle (agonist/antagonist) system with interaction is further studied. Moreover, a Model in combination with the central oscillation and peripheral system is developed. Some results are in accordance with the previous research, whereas some new findings are proposed according to the simulation study.