Validation of Inverse Dynamics Modelling and Correlation Analysis to Characterise Upper-Limb Tremor

2013 ◽  
pp. 697-702 ◽  
Author(s):  
D. G. Western ◽  
L. P. Ketteringham ◽  
S. A. Neild ◽  
R. A. Hyde ◽  
R. J. S. Jones ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Upper Limb ◽  
Inverse Dynamics ◽  
Dynamics Modelling

scholarly journals Inverse dynamics modelling of upper‐limb tremor, with cross‐correlation analysis

2014 ◽  
Vol 1 (2) ◽  
pp. 59-63 ◽  
Author(s):  
Laurence P. Ketteringham ◽  
David G. Western ◽  
Simon A. Neild ◽  
Richard A. Hyde ◽  
Rosie J.S. Jones ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Upper Limb ◽  
Cross Correlation ◽  
Inverse Dynamics ◽  
Cross Correlation Analysis ◽  
Dynamics Modelling

scholarly journals Abnormal Access of Axial Vibrotactile Input to Deafferented Somatosensory Cortex in Human Upper Limb Amputees

1997 ◽  
Vol 77 (5) ◽  
pp. 2753-2764 ◽  
Author(s):  
John J. M. Kew ◽  
Peter W. Halligan ◽  
John C. Marshall ◽  
Richard E. Passingham ◽  
JOHN C. Rothwell ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Correlation Analysis ◽  
Somatosensory Cortex ◽  
Upper Limb ◽  
Sensory Input ◽  
Human Subjects ◽  
Phantom Limb ◽  
Vibrotactile Stimulation ◽  
Pectoral Region ◽  
Human Upper Limb

Kew, John J. M., Peter W. Halligan, John C. Marshall, Richard E. Passingham, John C. Rothwell, Michael C. Ridding, C. David Marsden, and David J. Brooks. Abnormal access of axial vibrotactile input to deafferented somatosensory cortex in human upper limb amputees. J. Neurophysiol. 77: 2753–2764, 1997. We studied two human subjects with total deafferentation of one upper limb secondary to traumatic multiple cervical root avulsions. Both subjects developed a phantom limb and underwent elective amputation of the paralyzed, deafferentated limb. Psychophysical study revealed in each subject an area of skin in the pectoral region ipsilateral to the amputation where vibrotactile stimulation (VS) elicited referred sensations (RS) in the phantom limb. Positron emission tomography was then used to measure regional cerebral blood flow changes during VS of the pectoral region ipsilateral to the amputation with RS and during VS of a homologous part of the pectoral region adjacent to the intact arm without RS. A voxel-based correlation analysis was subsequently used to study functional connectivity. VS of the pectoral region adjacent to the intact arm was associated with activation of the dorsal part of the contralateral primary somatosensory cortex (S1) in a position consistent with the S1 trunk area. In contrast, VS of the pectoral region ipsilateral to the amputation with RS was associated with activation of the contralateral S1 that extended from the level of the trunk representation ventrally over distances of 20 and 12 mm, respectively, in the two subjects. The area of S1 activated during VS of the digits in a normal control subject was coextensive with the ventral S1 region abnormally activated during VS of the ectopic phantom representation in the two amputees, suggesting that the deafferented digit or hand/arm area had been activated by sensory input from the pectoral region. Correlation analysis showed an abnormal pattern of intrinsic connectivity within the deafferented S1 hand/arm area of both amputees. In one subject, the deafferented S1 was functionally connected with 3 times as many S1 voxels as the normally afferented S1. This abnormal functional connectivity extended in both the rostrocaudal and ventrodorsal dimensions. The results demonstrate that sensory input delivered to the axial body surface may gain access to the S1 hand/arm area in some humans who have suffered extensive deafferentation of this area. The findings are consistent with the hypothesis that deafferentation of an area of S1 may result in activation of previously dormant inputs from body surfaces represented in immediately adjacent parts of S1. The results also provide evidence that changes in functional connectivity between these adjacent areas of the cortex play a role in the somatotopic reorganization.

Influence of Position and Power Output on Upper Limb Kinetics in Cycling

2016 ◽  
Vol 32 (2) ◽  
pp. 140-149 ◽  
Author(s):  
Antony Costes ◽  
Nicolas A. Turpin ◽  
David Villeger ◽  
Pierre Moretto ◽  
Bruno Watier
Keyword(s):  
Upper Limb ◽  
Power Output ◽  
Inverse Dynamics ◽  
Random Order ◽  
Standing Position ◽  
Lower Limbs ◽  
Whole Body ◽  
Sit To Stand ◽  
Shoulder Joints ◽  
Limb Kinematics

Several suggestions on the upper limb involvement in cycling exist but, to date, no study has quantified upper limb kinetics in this task. The aim of this study was to determine how crank power and pedaling position (seated or standing) affect upper limb kinetics. Handlebar loadings and upper limb kinematics were collected from 17 participants performing seated or standing pedaling trials in a random order at 6 crank powers ranging from 20% (112 ± 19 W) to 120% (675 ± 113 W) of their spontaneous sit-to-stand transition power. An inverse dynamics approach was used to compute 3D moments, powers, and works at the wrist, elbow, and shoulder joints. Over 29 parameters investigated, increases in crank power were associated with increases in the magnitudes of 23 and 20 of the kinetic variables assessed in seated and standing positions, respectively. The standing position was associated with higher magnitudes of upper limb kinetics. These results suggest that both upper and lower limbs should be considered in future models to better understand whole body coordination in cycling.

Correlation analysis of motor function improvement and brain structure for upper limb paralysis

Neuroreport ◽  
2019 ◽  
Vol 30 (2) ◽  
pp. 77-81 ◽  
Author(s):  
Ryo Ueda ◽  
Naoki Yamada ◽  
Masahiro Abo ◽  
Atsushi Senoo
Keyword(s):  
Correlation Analysis ◽  
Motor Function ◽  
Upper Limb ◽  
Brain Structure

scholarly journals Determination of Joint Load of Human Lower Limb by Using 2D Inverse Dynamics Modelling

2019 ◽  
Vol 9 (1) ◽  
pp. 5723-5727
Keyword(s):  
Lower Limb ◽  
Inverse Dynamics ◽  
Joint Force ◽  
Joint Forces ◽  
Limb Kinematics ◽  
Dynamics Modelling ◽  
Squat Lifting ◽  
Joint Load ◽  
Joint Loads ◽  
Matlab Programming

The human lower limb is a major part of the human body that is exposed to high joint load during daily activities. Different lifestyles and cultural activities can affect the loading condition generated at the joint during motion. For instance, deep squatting is more frequently performed by Asians compared to Europeans e.g. kneeing on tatami among Japanese and sitting position during prayer among Muslims. The aim of this research is to determine the joint load of the human lower limb during the squat lifting movement by using inverse dynamics of 2-dimensional (2D) human lower limb model. The 2D inverse dynamics modelling was used to describe and compute all the joint force reactions from the known ground reaction and lower limb kinematics. In this study, 2D human lower limb model was analysed during the squat lifting movement. Inverse dynamics computation was performed using MATLAB programming based on Newton-Euler equations to determine the joint forces and moments. The joint loads at ankle, knee and hip joints for every knee flexion angle were obtained and the maximum forces at the ankle, knee and hip were 613.9, 614.1 and 596.1 N, respectively.

scholarly journals A Novel Explicit Analytical Multibody Approach for the Analysis of Upper Limb Dynamics and Joint Reactions Calculation Considering Muscle Wrapping

2020 ◽  
Vol 10 (21) ◽  
pp. 7760
Author(s):  
Alessandro Ruggiero ◽  
Alessandro Sicilia
Keyword(s):  
Upper Limb ◽  
Inverse Dynamics ◽  
Driving Forces ◽  
Dynamical Analysis ◽  
Limb Dynamics ◽  
External Forces ◽  
Musculoskeletal Systems ◽  
Muscle Actuators ◽  
Dynamics Problems ◽  
The Hill

The aim of this paper is to present an explicit analytical biomechanical multibody procedure able to be implemented in the solution of the musculoskeletal systems inverse dynamics problems. The model is proposed in formal multibody analysis and implemented in the Matlab numerical environment. It is based on the constraint kinematical behaviour analysis and considers both linear muscle actuators and curved ones, by calculating the geodesic muscle path over wrapping surfaces fixed to the bodies. The model includes the Hill muscle approach in order to evaluate both the contractile elements’ actions and the passive ones. With the aim to have a first validation, the model was applied to the dynamical analysis of the “arm26” OpenSim model, an upper limb subjected to external forces of gravity and to known kinematics. The comparison of results shows interesting matching in terms of kinematical analysis, driving forces, muscles’ activations and joint reactions, proving the reliability of the proposed approach in all cases in which it is necessary to achieve in-silico explicit determinations of the upper limb dynamics and joint reactions (i.e., in joint tribological optimization).

scholarly journals Assessment of a knee resistance by applying the computational methods

2020 ◽  
Vol 74 (1) ◽  
pp. 57-64
Author(s):  
Katarina Adamović ◽  
Arso Vukićević ◽  
Radun Vulović ◽  
Smiljana Đorović ◽  
Radivoje Radaković ◽  
...  
Keyword(s):  
Inverse Dynamics ◽  
Force Measurement ◽  
Biomechanical Model ◽  
The Finite Element Method ◽  
Significant Extent ◽  
Non Invasive ◽  
Tennis Serve ◽  
Dynamics Modelling ◽  
Computational Technology ◽  
And Cartilage

In tennis, the complex serving motions produce high mechanical stresses on player's musculoskeletal, tendon and ligament joints. In this paper, different cognitive methods have been integrated in order to non-invasively assess the knee's bone and cartilage resistance at the maximum power tennis serve. The proposed methodology is based on the creation of patientspecific biomechanical model, as well as on the tracking the knee's kinematics, ground force measurement, inverse dynamics modelling and analysis of the knee using the Finite Element Method with aim to assess the knee resistance of a tennis player, considering acute deformations and potential injuries. The main objective of this paper is development of the optimised computational technology and creation of practical diagnostic tool for non-invasive assessment of the knee function during specific moves and motions in tennis. It is expected that this approach can provide prediction and injury prevention in training and competitive tennis to a significant extent.

scholarly journals A Simplified Inverse Dynamics Modelling Method for a Novel Rehabilitation Exoskeleton with Parallel Joints and Its Application to Trajectory Tracking

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Qianqian Fang ◽  
Ge Li ◽  
Tian Xu ◽  
Jie Zhao ◽  
Hegao Cai ◽  
...  
Keyword(s):  
Trajectory Tracking ◽  
Inverse Dynamics ◽  
Joint Torque ◽  
The Novel ◽  
Upper Limb Rehabilitation ◽  
Conversion Algorithm ◽  
Dynamics Modelling ◽  
Limb Rehabilitation ◽  
The Relationship ◽  
Actuated Joints

In this paper, a new modular upper limb rehabilitation exoskeleton, which is actuated by a parallel mechanical structure, is designed to help stroke patients. For analysing the relationship between motor torque and joint torque of the novel exoskeleton, a conversion algorithm mapping motor motion to joint motion is developed here. Then, to simplify the dynamics model of exoskeleton with parallel actuated joints, the serial equivalence configuration dynamics of the exoskeleton is established to be equivalent to the parallel joints dynamics. Afterwards, a torque controller used for our exoskeleton is designed based on the proposed conversion algorithm and the inverse dynamics of exoskeleton. It should be noted that the controller mentioned above combines both conversion algorithm and joint position decoupling. At last, for verifying the effectiveness of the proposed algorithms, a trajectory tracking simulation is given, and the simulated results show the proposed algorithms are valid.

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