scholarly journals Estimation of Muscle Forces and Joint Moments Using a Forward-Inverse Dynamics Model

2005 ◽  
Vol 37 (11) ◽  
pp. 1911-1916 ◽  
Author(s):  
THOMAS S. BUCHANAN ◽  
DAVID G. LLOYD ◽  
KURT MANAL ◽  
THOR F. BESIER
Keyword(s):  
Inverse Dynamics ◽  
Muscle Forces ◽  
Dynamics Model ◽  
Joint Moments

Estimation of Muscle Forces About the Ankle During Gait in Healthy and Neurologically Impaired Subjects

2011 ◽  
pp. 320-347
Author(s):  
Daniel N. Bassett ◽  
Joseph D. Gardinier ◽  
Kurt T. Manal ◽  
Thomas S. Buchanan
Keyword(s):  
Muscle Activation ◽  
Inverse Dynamics ◽  
Biomechanical Model ◽  
Forward Dynamics ◽  
Muscle Forces ◽  
Dynamics Model ◽  
Joint Moments ◽  
Neurologically Impaired ◽  
Model Predictions ◽  
Contraction Dynamics

This chapter describes a biomechanical model of the forces about the ankle joint applicable to both unimpaired and neurologically impaired subjects. EMGs and joint kinematics are used as inputs and muscle forces are the outputs. A hybrid modeling approach that uses both forward and inverse dynamics is employed and physiological parameters for the model are tuned for each subject using optimization procedures. The forward dynamics part of the model takes muscle activation and uses Hill-type models of muscle contraction dynamics to estimate muscle forces and the corresponding joint moments. Inverse dynamics is used to calibrate the forward dynamics model predictions of joint moments. In this chapter we will describe how to implement an EMG-driven hybrid forward and inverse dynamics model of the ankle that can be used in healthy and neurologically impaired people.

ANALYSIS OF THE EFFECTS OF SPINE STABILIZATION EXERCISES USING A WHOLE BODY TILT DEVICE ON MUSCLE FORCES IN THE SPINE

2014 ◽  
Vol 14 (06) ◽  
pp. 1440003
Author(s):  
KAP-SOO HAN ◽  
CHANG HO YU ◽  
MYOUNG-HWAN KO ◽  
TAE KYU KWON
Keyword(s):  
Inverse Dynamics ◽  
The Elderly ◽  
Body Tilt ◽  
Whole Body ◽  
Muscle Forces ◽  
Activation Patterns ◽  
Muscle Strengthening ◽  
Spine Stabilization ◽  
Inverse Dynamics Analysis ◽  
The Right

The objective of the study was to investigate the effects of 3D stabilization exercises using a whole body tilt device on forces in the trunk, such as individual muscle forces and activation patterns, maximum muscle activities and spine loads. For this sake, a musculoskeletal (MS) model of the whole body was developed, and an inverse dynamics analysis was performed to predict the forces on the spine. An EMG measurement experiment was conducted to validate the muscle forces and activation patterns. The MS model was rotated and tilted in eight different directions: anterior (A), posterior (P), anterior right (AR), posterior right (PR), anterior left (AL), posterior left (PL), right (R) and left (L), replicating the directions of the 3D spine balance exercise device, as performed in the experiment. The anterior directions of the tilt primarily induced the activation of long and superficial back muscles and the posterior directions activated the front muscles. However, deep muscles, such as short muscles and multifidi, were activated in all directions of the tilt. The resultant joint forces in the right and left directions of the tilt were the least among the directions, but higher muscle activations and more diverse muscle recruitments than other positions were observed. Therefore, these directions of tilt may be suitable for the elderly and rehabilitation patients who require muscle strengthening with less spinal loads. In the present investigation, it was shown that 3D stabilization exercises could provide considerable muscle exercise effects with a minimum perturbation of structure. The results of this study can be used to provide safety guidelines for muscle exercises using this type of tilting device. Therefore, the proposed direction of tilt can be used to strengthen targeted muscles, depending on the patients' muscular condition.

scholarly journals A Systematic Review of the Associations Between Inverse Dynamics and Musculoskeletal Modeling to Investigate Joint Loading in a Clinical Environment

2020 ◽  
Vol 8 ◽  
Author(s):  
Jana Holder ◽  
Ursula Trinler ◽  
Andrea Meurer ◽  
Felix Stief
Keyword(s):  
Knee Joint ◽  
Clinical Decision Making ◽  
Inverse Dynamics ◽  
Clinical Decision ◽  
Contact Forces ◽  
Musculoskeletal Modeling ◽  
Joint Loading ◽  
Joint Moments ◽  
Internal Joint ◽  
Joint Contact

The assessment of knee or hip joint loading by external joint moments is mainly used to draw conclusions on clinical decision making. However, the correlation between internal and external loads has not been systematically analyzed. This systematic review aims, therefore, to clarify the relationship between external and internal joint loading measures during gait. A systematic database search was performed to identify appropriate studies for inclusion. In total, 4,554 articles were identified, while 17 articles were finally included in data extraction. External joint loading parameters were calculated using the inverse dynamics approach and internal joint loading parameters by musculoskeletal modeling or instrumented prosthesis. It was found that the medial and total knee joint contact forces as well as hip joint contact forces in the first half of stance can be well predicted using external joint moments in the frontal plane, which is further improved by including the sagittal joint moment. Worse correlations were found for the peak in the second half of stance as well as for internal lateral knee joint contact forces. The estimation of external joint moments is useful for a general statement about the peak in the first half of stance or for the maximal loading. Nevertheless, when investigating diseases as valgus malalignment, the estimation of lateral knee joint contact forces is necessary for clinical decision making because external joint moments could not predict the lateral knee joint loading sufficient enough. Dependent on the clinical question, either estimating the external joint moments by inverse dynamics or internal joint contact forces by musculoskeletal modeling should be used.

scholarly journals Effect of the upward curvature of toe springs on walking biomechanics in humans

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Freddy Sichting ◽  
Nicholas B. Holowka ◽  
Oliver B. Hansen ◽  
Daniel E. Lieberman
Keyword(s):  
Plantar Fasciitis ◽  
Inverse Dynamics ◽  
Joint Moments ◽  
Work Requirements ◽  
Pathological Conditions ◽  
Foot Biomechanics ◽  
Walking Biomechanics ◽  
Foot Function ◽  
Upward Curvature ◽  
Increased Susceptibility

Abstract Although most features of modern footwear have been intensively studied, there has been almost no research on the effects of toe springs. This nearly ubiquitous upward curvature of the sole at the front of the shoe elevates the toe box dorsally above the ground and thereby holds the toes in a constantly dorsiflexed position. While it is generally recognized that toe springs facilitate the forefoot’s ability to roll forward at the end of stance, toe springs may also have some effect on natural foot function. This study investigated the effects of toe springs on foot biomechanics in a controlled experiment in which participants walked in specially-designed sandals with varying curvature in the toe region to simulate toe springs ranging from 10 to 40 degrees of curvature. Using inverse dynamics techniques, we found that toe springs alter the joint moments and work at the toes such that greater degrees of toe spring curvature resulted in lower work requirements during walking. Our results help explain why toe springs have been a pervasive feature in shoes for centuries but also suggest that toe springs may contribute to weakening of the foot muscles and possibly to increased susceptibility to common pathological conditions such as plantar fasciitis.

Quaternion-Based Inverse Dynamics Model for Expressing Aerobatic Aircraft Trajectories

2009 ◽  
Vol 32 (4) ◽  
pp. 1388-1391 ◽  
Author(s):  
Rick G. Drury ◽  
James F. Whidborne
Keyword(s):  
Inverse Dynamics ◽  
Dynamics Model ◽  
Aircraft Trajectories

A Well-Posed, Embedded Constraint Representation of Joint Moments From Kinesiological Measurements

2000 ◽  
Vol 122 (4) ◽  
pp. 437-445 ◽  
Author(s):  
Behzad Dariush ◽  
Hooshang Hemami ◽  
Mohamad Parnianpour
Keyword(s):  
Inverse Dynamics ◽  
Force Plate ◽  
Dynamics Analysis ◽  
Noise Levels ◽  
Joint Moments ◽  
Planar System ◽  
Open Chain ◽  
Inverse Dynamics Analysis ◽  
Well Posed ◽  
Dynamics Method

Joint moment estimation using the traditional inverse dynamics analysis presents two challenging problems, which limit its reliability. First, the quality of the computed moments depends directly on unreliable estimates of the segment accelerations obtained numerically by differentiating noisy marker measurements. Second, the representation of joint moments from combined video and force plate measurements belongs to a class of ill-posed problems, which does not possess a unique solution. This paper presents a well-posed representation derived from an embedded constraint equation. The proposed method, referred to as the embedded constraint representation (ECR), provides unique moment estimates, which satisfy all measurement constraints and boundary conditions and require fewer acceleration components than the traditional inverse dynamics method. Specifically, for an n-segment open chain planar system, the ECR requires n−3 acceleration components as compared to 3n−1 components required by the traditional (from ground up) inverse dynamics analysis. Based on a simulated experiment using a simple three-segment model, the precision of the ECR is evaluated at different noise levels and compared to the traditional inverse dynamics technique. At the lowest noise levels, the inverse dynamics method is up to 50 percent more accurate while at the highest noise levels the ECR method is up to 100 percent more accurate. The ECR results over the entire range of noise levels reveals an average improvement on the order 20 percent in estimating the moments distal to the force plate and no significant improvement in estimating moments proximal to the force plate. The new method is particularly advantageous in a combined video, force plate, and accelerometery sensing strategy. [S0148-0731(00)01904-X]

Modeling and Workplace Analysis of 3T Cable-Driven Parallel Manipulator

2013 ◽  
Vol 415 ◽  
pp. 519-523
Author(s):  
Li Wen Guan ◽  
Cheng Long Mu ◽  
Yu Jian Hu
Keyword(s):  
Numerical Simulation ◽  
Dynamic Modeling ◽  
Parallel Manipulator ◽  
Inverse Dynamics ◽  
Comprehensive Analysis ◽  
Dynamics Model ◽  
Set Up

This paper analyzes the dynamic modeling and workplace of the 3T cable-driven parallel manipulator. The mechanism utilizes four cables to driven. Firstly, the kinematics equations and the inverse dynamics model were set up for the analysis. And then, pseudo-drag is a serious problem in cable-driven parallel manipulator, this paper give a method to find the workplace under the condition of pseudo-drag. Finally, through numerical simulation, the workplace of the mechanism satisfying the demand is presented by comprehensive analysis.

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