Investigation of the EEG scalp distribution for estimation of shoulder joint torque in the upper-limb power assistant system

2016 ◽  
Author(s):  
Hongbo Liang ◽  
Chi Zhu ◽  
Masataka Yoshioka ◽  
Naoya Ueda ◽  
Ye Tian ◽  
...  
Keyword(s):  
Upper Limb ◽  
Shoulder Joint ◽  
Joint Torque ◽  
Scalp Distribution

scholarly journals Upper-Limb Isometric Force Feasible Set: Evaluation of Joint Torque-Based Models

Biomechanics ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 102-117
Author(s):  
Nasser Rezzoug ◽  
Vincent Hernandez ◽  
Philippe Gorce
Keyword(s):  
Upper Limb ◽  
Isometric Force ◽  
Joint Torque ◽  
Force Distribution ◽  
Prediction Errors ◽  
Feasible Set ◽  
Joint Torques ◽  
Motor Abilities ◽  
Capacity Evaluation ◽  
Measured Force

A force capacity evaluation for a given posture may provide better understanding of human motor abilities for applications in sport sciences, rehabilitation and ergonomics. From data on posture and maximum isometric joint torques, the upper-limb force feasible set of the hand was predicted by four models called force ellipsoid, scaled force ellipsoid, force polytope and scaled force polytope, which were compared with a measured force polytope. The volume, shape and force prediction errors were assessed. The scaled ellipsoid underestimated the maximal mean force, and the scaled polytope overestimated it. The scaled force ellipsoid underestimated the volume of the measured force distribution, whereas that of the scaled polytope was not significantly different from the measured distribution but exhibited larger variability. All the models characterized well the elongated shape of the measured force distribution. The angles between the main axes of the modelled ellipsoids and polytopes and that of the measured polytope were compared. The values ranged from 7.3° to 14.3°. Over the entire surface of the force ellipsoid, 39.7% of the points had prediction errors less than 50 N; 33.6% had errors between 50 and 100 N; and 26.8% had errors greater than 100N. For the force polytope, the percentages were 56.2%, 28.3% and 15.4%, respectively.

scholarly journals Modifiability of abnormal isometric elbow and shoulder joint torque coupling after stroke

2005 ◽  
Vol 32 (2) ◽  
pp. 170-178 ◽  
Author(s):  
Michael D. Ellis ◽  
Bradley G. Holubar ◽  
Ana Maria Acosta ◽  
Randall F. Beer ◽  
Julius P. A. Dewald
Keyword(s):  
Shoulder Joint ◽  
Joint Torque

Biomechanical Model of the Press Handstand in Gymnastics

1988 ◽  
Vol 4 (4) ◽  
pp. 326-341 ◽  
Author(s):  
Spiros G. Prassas
Keyword(s):  
Shoulder Joint ◽  
Joint Angle ◽  
Wrist Joint ◽  
Center Of Mass ◽  
Biomechanical Model ◽  
Joint Torque ◽  
Joint Torques ◽  
Skilled Performance ◽  
The Press ◽  
Line Passing

A biomechanical model of the press handstand was developed to evaluate and predict the shoulder joint torque requirements as well as the motion of a gymnast’s center of mass (CM) from an initial to a final (handstand) position. Five press handstands executed by gymnasts of differing abilities were filmed and analyzed. The results were compared to the predicted parameters of simulated presses. It was found that execution of the skill with fewer fluctuations in trunk and lower extremities angular velocity—a characteristic of skilled performance—required smoother and at times larger shoulder joint torques. Reduction of the hip joint angle by only 5 or 10° did not substantially reduce the shoulder joint torque requirements. Regarding CM motion, it was found that during performance the CM continuously elevated and remained close to a vertical line passing through the center of the wrist joint. All gymnasts, however, were found to be leaning slightly backward during the first part of the movement and slightly forward during the later phases. Modifications in wrist joint angle required to maintain each gymnast’s CM precisely above the center of the wrist joint were investigated.

scholarly journals Reverse shoulder joint replacement in rheumatoid arthritis: medium-term results in 37 patients

2018 ◽  
Vol 12 (3) ◽  
pp. 89-93
Author(s):  
M. A. Makarov ◽  
A. A. Roskidailo ◽  
M. V. Panteleev
Keyword(s):  
Quality Of Life ◽  
Rheumatoid Arthritis ◽  
Functional Status ◽  
Upper Limb ◽  
Joint Replacement ◽  
Shoulder Joint ◽  
Joint Damage ◽  
Dash Score ◽  
The Mean

Objective:to assess functional results and quality of life in patients with rheumatoid arthritis (RA) after reverse shoulder joint replacement.Patients and methods.Examinations were made in 37 patients with RA involving the shoulder joint, who underwent shoulder joint replacement using a reverse DeltaX-tend DePuy prosthesis in 2006–2017. The investigators studied the volume of movements, the level of pain using the visual analogue scale, the function of the shoulder joint using the American Shoulder and Elbow Surgeons (ASES) Shoulder Score and the upper limb as a whole by the Disability of the Arm, Shoulder and Hand (DASH) questionnaire, a patient's functional status by the Health Assessment Questionnaire (HAQ), quality of life (QL) by EQ-5D (Euro Quolish instrument) and analyzed shoulder X-ray films before and in the late periods after surgery.Results.The volume of shoulder joint movements was found to increase. At 28.7 months postsurgery, the mean volume of flexion, abduction, and external rotation was 107.4Ѓ}15.2, 128.3Ѓ}8.5, and 46.4Ѓ}5.5°; respectively (p≤0.05). The patients experienced no pain in the late periods following surgery. Prior to surgery and at control examination, the mean ASES scores were 25.0Ѓ}4.7 and 79.4Ѓ}6.4, respectively (p≤0.05). Before surgery, the mean DASH score was 63.8Ѓ}4.2; in the late periods it decreased to 18.2Ѓ}8.6 (p ≤ 0.05). The mean preoperative HAQ score was 2.81; following surgery, it also decreased to 1.39 (p≤0.05). The postoperative EQ-5D QOL index score increased from 0.41 to 0.72. The rate of complications reached 10.8%.Conclusion.Reverse endoprosthetic replacement for end-stage shoulder joint damage (Larsen 4–5) with rotator cuff defect makes it possible to increase the volume of movements, to reduce pain, and to improve upper limb function, functional status, and quality of life in patients with RA.

scholarly journals Characteristics of physiological tremor of upper limb and the application to functional evaluation for disorders of shoulder joint

2008 ◽  
Vol 44 (3) ◽  
pp. 151-164
Author(s):  
Kazuyoshi SAKAMOTO ◽  
Toshihiro KUROKAWA ◽  
Takehiko YAMAJI ◽  
Kazuyuki MITO ◽  
Masato TAKANOKURA
Keyword(s):  
Upper Limb ◽  
Shoulder Joint ◽  
Functional Evaluation ◽  
Physiological Tremor

scholarly journals Higher Dimensional Spatial Expression of Upper Limb Manipulation Ability Based on Human Joint Torque Characteristics

10.5772/9344 ◽  
2010 ◽  
Author(s):  
Makoto Sasaki ◽  
Takehiro Iwami ◽  
Kazuto Miyawaki ◽  
Ikuro Sato ◽  
Goro Obinata ◽  
...  
Keyword(s):  
Upper Limb ◽  
Joint Torque ◽  
Spatial Expression ◽  
Higher Dimensional ◽  
Human Joint
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