Muscle Property Identification During Joint Motion Using the NL-LTP Method

2008 ◽

Vol 24 (3) ◽

pp. 207-214 ◽

Cited By ~ 13

Author(s):

Samantha L. Winter ◽

John H. Challis

Keyword(s):

Muscle Fiber ◽

Plantar Flexion ◽

Experimental Results ◽

Joint Motion ◽

Plateau Region ◽

Length Relationship ◽

Relationship Of ◽

Muscle Models ◽

Muscle Property

For a physiologically realistic range of joint motion and therefore range of muscle fiber lengths, only part of the force-length curve can be used in vivo; i.e., the section of the force–length curve that is expressed can vary. The purpose of this study was to determine the expressed section of the force–length relationship of the gastrocnemius for humans. Fourteen male and fourteen female subjects aged 18–27 performed maximal isometric plantar flexions in a Biodex dynamometer. Plantar flexion moments were recorded at five ankle angles: −15°, 0°, 15°, 30°, and 40°, with negative angles defined as dorsiflexion. These measurements were repeated for four randomly ordered knee angles over two testing sessions 4 to 10 days apart. The algorithm of Herzog and ter Keurs (1988a) was used to reconstruct the force–length curves of the biarticular gastrocnemius. Twenty-four subjects operated over the ascending limb, three operated over the descending limb, and one operated over the plateau region. The variation found suggests that large subject groups should be used to determine the extent of normal in vivo variability in this muscle property. The possible source of the variability is discussed in terms of parameters typically used in muscle models.

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Clinical Update: Measuring Shoulder Joint Motion

Guides Newsletter ◽

10.1001/amaguidesnewsletters.1998.sepoct02 ◽

1998 ◽

Vol 3 (5) ◽

pp. 4-5

Author(s):

Christopher R. Brigham

Keyword(s):

External Rotation ◽

Joint Motion ◽

Fourth Edition ◽

Single Plane ◽

Reconstructive Procedures ◽

Results Of Treatment ◽

Shoulder Disorders ◽

Shoulder Motion ◽

Motion Measurements ◽

Upper Extremity Impairment

Abstract Accurate measurement of shoulder motion is critical in assessing impairment following shoulder disorders. To this end, measuring and recording joint motion are important steps in diagnosing, determining the severity and progression of a disorder, assessing the results of treatment, and evaluating impairment. Shoulder movement usually is composite rather than in a single plane, so isolating single movements is challenging. Universal goniometers with long arms are used to measure shoulder motion, and testing must be performed and recorded consistently. Passive motion may be carried out cautiously by the examiner; two measurements of the same patient by the same examiner should lie within 10° of each other. Shoulder extension and flexion are illustrated. Maximal flexion of the shoulder also includes slight external rotation and abduction, and controlling or eliminating these components during evaluation is challenging. Abduction and adduction are illustrated. Deficits in external rotation may occur in patients who have undergone reconstructive procedures with an anterior approach; deficits in internal rotation may result from issues with shoulder instability. The authors recommend recording the shoulder's range of motion measurements according to the Upper Extremity Impairment Evaluation Record in the AMA Guides to the Evaluation of Permanent Impairment, Fourth Edition.

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Designing a coherent land registration system for rural Portugal

Conference Proceedings of the Academy for Design Innovation Management ◽

10.33114/adim.2019.c21.150 ◽

2019 ◽

Vol 2 (1) ◽

Author(s):

Tiago NUNES ◽

Miguel COUTINHO

Keyword(s):

Satellite Images ◽

Field Research ◽

Digital Native ◽

Web Based ◽

Registration System ◽

Land Registration ◽

Daily Rate ◽

Property Owners ◽

Property Identification

After almost a century of several attempts to establish a coherent land registration system across the whole country, in 2017 the Portuguese government decided to try a new, digital native approach to the problem. Thus, a web-based platform was created, where property owners from 10 pilot municipalities could manually identify their lands’ properties using a map based on satellite images. After the first month of submissions, it became clear that at the current daily rate, it would take years to achieve the goal of 100% rural property identification across just the 10 municipalities. Field research during the first month after launch enabled us to understand landowners’ relationships with their land, map their struggles with the platform, and prototype ways to improve the whole service. Understanding that these improvements would still not be enough to get to the necessary daily rate, we designed, tested and validated an algorithm that allows us to identify a rural property shape and location without coordinates. Today, we are able to help both Government and landowners identify a rural property location with the click of a button.

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Controllable Compliance Joint For Human Oriented Robots

Journal of Theoretical and Applied Mechanics ◽

10.2478/jtam-2013-0005 ◽

2013 ◽

Vol 43 (1) ◽

pp. 47-60

Author(s):

Mihail Tsveov ◽

Dimitar Chakarov

Keyword(s):

Numerical Experiments ◽

Position Control ◽

Joint Stiffness ◽

Joint Motion ◽

Compliance Control ◽

Leaf Springs ◽

Antagonistic Actuation

Abstract In the paper, different approaches for compliance control for human oriented robots are revealed. The approaches based on the non- antagonistic and antagonistic actuation are compared. In addition, an approach is investigated in this work for the compliance and the position control in the joint by means of antagonistic actuation. It is based on the capability of the joint with torsion leaf springs to adjust its stiffness. Models of joint stiffness are presented in this paper with antagonistic and non-antagonistic influence of the spring forces on the joint motion. The stiffness and the position control possibilities are investigated and the opportunity for their decoupling as well. Some results of numerical experiments are presented in the paper too.

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Shoulder Joint Motion Analysis of Daily Living Activities Using a Global Coordinate System

The Japanese Journal of Rehabilitation Medicine ◽

10.2490/jjrmc.50.840 ◽

2013 ◽

Vol 50 (10) ◽

pp. 840-844

Author(s):

Yukiya INOUE ◽

Mayumi KIHARA ◽

Junko YOSHIMURA ◽

Naoki YOSHIDA ◽

Kenji MATSUMOTO ◽

...

Keyword(s):

Coordinate System ◽

Motion Analysis ◽

Shoulder Joint ◽

Daily Living ◽

Global Coordinate System ◽

Joint Motion ◽

Daily Living Activities

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Application Study on Finger Joint Motion in Rehabilitation Training

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.644-650.879 ◽

2014 ◽

Vol 644-650 ◽

pp. 879-883

Author(s):

Jing Jing Yu

Keyword(s):

Control Method ◽

Finger Joint ◽

Continuous Passive Motion ◽

Joint Motion ◽

Joint Movement ◽

Rehabilitation Training ◽

Angle Data ◽

Finger Flexion ◽

And Control ◽

Flexion And Extension

In various forms of movement of finger rehabilitation training, Continuous Passive Motion (CPM) of single degree of freedom (1 DOF) has outstanding application value. Taking classic flexion and extension movement for instance, this study collected the joint angle data of finger flexion and extension motion by experiments and confirmed that the joint motion of finger are not independent of each other but there is certain rule. This paper studies the finger joint movement rule from qualitative and quantitative aspects, and the conclusion can guide the design of the mechanism and control method of finger rehabilitation training robot.

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Joint Motion Segmentation and Background Estimation in Dynamic Scenes

2014 IEEE Conference on Computer Vision and Pattern Recognition ◽

10.1109/cvpr.2014.54 ◽

2014 ◽

Cited By ~ 6

Author(s):

Adeel Mumtaz ◽

Weichen Zhang ◽

Antoni B. Chan

Keyword(s):

Motion Segmentation ◽

Joint Motion ◽

Dynamic Scenes ◽

Background Estimation

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Evidence for a vertebrate catapult: elastic energy storage in the plantaris tendon during frog jumping

Biology Letters ◽

10.1098/rsbl.2011.0982 ◽

2011 ◽

Vol 8 (3) ◽

pp. 386-389 ◽

Cited By ~ 85

Author(s):

Henry C. Astley ◽

Thomas J. Roberts

Keyword(s):

Energy Storage ◽

Elastic Energy ◽

High Speed ◽

Angular Acceleration ◽

Whole Body ◽

Joint Motion ◽

Joint Movement ◽

Fascicle Length ◽

Muscle Fascicle ◽

Muscle Shortening

Anuran jumping is one of the most powerful accelerations in vertebrate locomotion. Several species are hypothesized to use a catapult-like mechanism to store and rapidly release elastic energy, producing power outputs far beyond the capability of muscle. Most evidence for this mechanism comes from measurements of whole-body power output; the decoupling of joint motion and muscle shortening expected in a catapult-like mechanism has not been demonstrated. We used high-speed marker-based biplanar X-ray cinefluoroscopy to quantify plantaris muscle fascicle strain and ankle joint motion in frogs in order to test for two hallmarks of a catapult mechanism: (i) shortening of fascicles prior to joint movement (during tendon stretch), and (ii) rapid joint movement during the jump without rapid muscle-shortening (during tendon recoil). During all jumps, muscle fascicles shortened by an average of 7.8 per cent (54% of total strain) prior to joint movement, stretching the tendon. The subsequent period of initial joint movement and high joint angular acceleration occurred with minimal muscle fascicle length change, consistent with the recoil of the elastic tendon. These data support the plantaris longus tendon as a site of elastic energy storage during frog jumping, and demonstrate that catapult mechanisms may be employed even in sub-maximal jumps.

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