Evaluation of Body Joint Motion Stressfulness Based on Perceived Discomfort

2000 ◽  
Vol 44 (30) ◽  
pp. 5-595-5-595
Author(s):  
Dohyung Kee ◽  
Waldemar Karwowski
Keyword(s):  
Magnitude Estimation ◽  
Laboratory Experiments ◽  
Joint Motion ◽  
Ranking Systems ◽  
Joint Motions ◽  
Body Joint

This study aims to develop ranking systems for evaluation of the stressfulness of the joint motions based on perceived discomforts, which were measured in the laboratory experiments in the sitting and standing postures using the magnitude estimation. The results showed that the perceived joint discomforts were affected by the joint motions, type of joint motions, and joints. The joints and joint motions were classified into several distinct classes according to perceived stresses. Three ranking systems based on the perceived discomforts were developed, including classification by the joint motions and joints, by types of joint motions, and by the joints only. The ranking systems developed in this study were different from the existing rankings reported by others.

scholarly journals Evaluation of Joint Motion Sensing Efficiency According to the Implementation Method of SWCNT-Coated Fabric Motion Sensor

Sensors ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 284 ◽  
Author(s):  
Hyun-Seung Cho ◽  
Jin-Hee Yang ◽  
Jeong-Hwan Lee ◽  
Joo-Hyeon Lee
Keyword(s):  
Motion Sensor ◽  
Joint Motion ◽  
Motion Sensors ◽  
Motion Sensing ◽  
Piezoresistive Sensors ◽  
Piezoresistive Sensor ◽  
Acceleration Sensors ◽  
Flexion Extension ◽  
Joint Motions ◽  
Walled Carbon Nanotubes

The purpose of this study was to investigate the effects of the shape and attachment position of stretchable textile piezoresistive sensors coated with single-walled carbon nanotubes on their performance in measuring the joint movements of children. The requirements for fabric motion sensors suitable for children are also identified. The child subjects were instructed to wear integrated clothing with sensors of different shapes (rectangular and boat-shaped), attachment positions (at the knee and elbow joints or 4 cm below the joints). The change in voltage caused by the elongation and contraction of the fabric sensors was measured for the flexion-extension motions of the arms and legs at 60°/s (three measurements of 10 repetitions each for the 60° and 90° angles, for a total of 60 repetitions). Their reliability was verified by analyzing the agreement between the fabric motion sensors and attached acceleration sensors. The experimental results showed that the fabric motion sensor that can measure children’s arm and leg motions most effectively is the rectangular-shaped sensor attached 4 cm below the joint. In this study, we developed a textile piezoresistive sensor suitable for measuring the joint motion of children, and analyzed the shape and attachment position of the sensor on clothing suitable for motion sensing. We showed that it is possible to sense joint motions of the human body by using flexible fabric sensors integrated into clothing.

scholarly journals A real-time inverse kinematics solution based on joint perturbation for redundant manipulators

2021 ◽  
Vol 12 (1) ◽  
pp. 221-235
Author(s):  
Qinhuan Xu ◽  
Qiang Zhan
Keyword(s):  
Real Time ◽  
Inverse Kinematics ◽  
Inverse Method ◽  
Production Efficiency ◽  
Fine Tuning ◽  
Joint Motion ◽  
Redundant Manipulators ◽  
Work Cycle ◽  
Joint Motions ◽  
Pseudo Inverse

Abstract. Aiming at the problem that the calculation of the inverse kinematics solution of redundant manipulators is very time-consuming, this paper presents a real-time method based on joint perturbation and joint motion priority. The method first seeks the pose nearest to the target pose in the manipulator's pose set through fine-tuning all the joints with different angle deviations at the same time and then regards this pose as the starting one to perform iterative calculations until the error between the current pose and the target pose is less than the predetermined error, thus obtaining the inverse kinematics solution corresponding to the target pose. This method can avoid the pseudo-inverse calculations of the Jacobian matrix and significantly reduce the solving complexity. Two types of manipulators are taken as examples to validate the proposed method. Under the premise that the manipulator motion trajectory is satisfied, the Jacobian pseudo-inverse method and the proposed method are both adopted to solve the inverse kinematics. Simulations and comparisons show that the proposed method has better real-time performance, and the joint motions can be flexibly controlled by setting different joint motion priorities. This method can make the work cycle faster and improve the production efficiency of redundant manipulators in real applications.

scholarly journals Using Magneto-Inertial Measurement Units to Pervasively Measure Hip Joint Motion during Sports

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4970
Author(s):  
Rachel E. Horenstein ◽  
Yohann R. Goudeau ◽  
Cara L. Lewis ◽  
Sandra J. Shefelbine
Keyword(s):  
Hip Joint ◽  
Wireless Sensors ◽  
Measurement Unit ◽  
After School ◽  
Joint Motion ◽  
Inertial Measurement ◽  
School Activities ◽  
Elite Level ◽  
Joint Motions ◽  
Future Work

The use of wireless sensors to measure motion in non-laboratory settings continues to grow in popularity. Thus far, most validated systems have been applied to measurements in controlled settings and/or for prescribed motions. The aim of this study was to characterize adolescent hip joint motion of elite-level athletes (soccer players) during practice and recreationally active peers (controls) in after-school activities using a magneto-inertial measurement unit (MIMU) system. Opal wireless sensors (APDM Inc., Portland OR, USA) were placed at the sacrum and laterally on each thigh (three sensors total). Hip joint motion was characterized by hip acceleration and hip orientation for one hour of activity on a sports field. Our methods and analysis techniques can be applied to other joints and activities. We also provide recommendations in order to guide future work using MIMUs to pervasively assess joint motions of clinical relevance.

scholarly journals Lower Limb Kinematic Coordination during the Running Motion of Stroke Patient: A Single Case Study

2022 ◽  
Vol 7 (1) ◽  
pp. 6
Author(s):  
Noboru Chiba ◽  
Tadayoshi Minamisawa
Keyword(s):  
Stroke Patient ◽  
Lower Limb ◽  
Healthy Subjects ◽  
Motor Coordination ◽  
Single Case ◽  
Three Dimensional ◽  
Joint Motion ◽  
Motion Problems ◽  
Analysis System ◽  
Joint Motions

The purpose of this study was to clarify the lower limb joint motor coordination of para-athletes during running motion from frequency characteristics and to propose this as a method for evaluating their performance. The subject used was a 43-year-old male para-athlete who had suffered a left cerebral infarction. Using a three-dimensional motion analysis system, the angles of the hip, knee, and ankle joints were measured during 1 min of running at a speed of 8 km/h on a treadmill. Nine inter- and intra-limb joint angle pairs were analyzed by coherence and phase analyses. The main characteristic of the stroke patient was that there were joint pairs with absent or increased coherence peaks in the high-frequency band above 4 Hz that were not found in healthy subjects. Interestingly, these features were also observed on the non-paralyzed side. Furthermore, a phase analysis showed different phase differences between the joint motions of the stroke patient and healthy subjects in some joint pairs. Thus, we concluded there was a widespread functional impairment of joint motion in the stroke patient that has not been revealed by conventional methods. The coherence analysis of joint motion may be useful for identifying joint motion problems in para-athletes.

Kinematic Analysis and Design of Articulated Manipulators With Joint Motion Constraints

1992 ◽  
Author(s):  
T. A. Dwarakanath ◽  
A. Ghosal ◽  
U. Shrinivasa
Keyword(s):  
Kinematic Analysis ◽  
Numerical Procedure ◽  
Joint Motion ◽  
Joint Rotation ◽  
Analysis And Design ◽  
Motion Constraints ◽  
Work Area ◽  
Rectangular Area ◽  
Joint Motions ◽  
Bounding Surfaces

Abstract This paper deals with kinematic analysis and design of articulated manipulators having constraints on joint motions. For an articulated manipulator with joint rotation constraints, the workspace is composed of several bounding surfaces and the number of bounding surfaces depend on the ranges and the mean positions of joint rotations. We show that the maximum workspace is not necessarily obtained for equal link lengths but is also determined by the range and mean positions of the joint motions. We present expressions for sectional area, workspace volume, overlap volume and work area in terms of link ratios, mean positions and ranges of joint motion. To ensure maximum utilization of a manipulator in applications such as painting and welding, instead of the total workspace, it is often of more interest to obtain the maximum regular area or volume that can be embedded inside the workspace. In this paper, we present a numerical procedure to obtain the maximum rectangular area that can be embedded in the workspace of an articulated manipulator with joint rotation constraints. The analytical expressions and the numerical plots are used for the kinematic design of an articulated manipulators with joint rotation constraints.

Kinematic Analysis and Design of Articulated Manipulators with Joint Motion Constraints

1994 ◽  
Vol 116 (3) ◽  
pp. 969-972 ◽  
Author(s):  
T. A. Dwarakanath ◽  
A. Ghosal ◽  
U. Shrinivasa
Keyword(s):  
Numerical Procedure ◽  
Joint Motion ◽  
Sectional Area ◽  
Joint Rotation ◽  
Analysis And Design ◽  
Motion Constraints ◽  
Work Area ◽  
Rectangular Area ◽  
Joint Motions ◽  
Analytical Expressions

For an articulated manipulator with joint rotation constraints, we show that the maximum workspace is not necessarily obtained for equal link lengths but is also determined by the range and mean positions of the joint motions. We present expressions for sectional area, workspace volume, overlap volume and work area in terms of link ratios, mean positions and ranges of joint motion. We present a numerical procedure to obtain the maximum rectangular area that can be embedded in the workspace of an articulated manipulator with joint motion constraints. We demonstrate the use of analytical expressions and the numerical plots in the kinematic design of an articulated manipulator with joint rotation constraints.

scholarly journals Conditions for CNT – Coated Textile Sensors Applied to Wearable Platforms to Monitor Limb Joint Motion

2021 ◽  
Vol 45 (4) ◽  
Author(s):  
Da-Hye Kang ◽  
Joo-Hyeon Lee ◽  
Jeong-Whan Lee ◽  
Hyun-Seung Cho ◽  
Seon-Hyung Park ◽  
...  
Keyword(s):  
Human Body ◽  
Body Movement ◽  
Measurement Techniques ◽  
Joint Motion ◽  
Motion Sensors ◽  
Large Space ◽  
Motion Measurement ◽  
Sensor Structure ◽  
Textile Sensors ◽  
Joint Motions

AbstractDespite recent research on joint motion measurement to monitor human body movement, current measurement techniques and tools have significant limitations, including requiring large space for measurement and causing discomfort in test subjects wearing motion sensors. Our study aims, first, to develop carbon nanotube (CNT)-based textile joint motion sensors. Second, ours study aims to identify the most suitable CNT-based sensor structure and attachment method for use on a wearable platform during general exercise speeds. Lastly, we used these sensors on the human body, using sleeves and legs to find the most stable location, and we used the CNT-based sensor condition to monitor joint motions. We utilized our CNT-based sensor, which has proper elasticity as well as conductivity, and applied it to the elbow and knee joints. Based on the strain gauge principle, we monitored the variance of electric resistance that occurred when the CNT-based sensor was stretched due to limb motion. Our study tested 48 types of sensors. These sensors were applied to the CNT using different base knit textiles as well as different attachment methods, layers, sensor lengths, and sensor widths. The four most successful sensor types, which showed superior efficacy over the others in joint motion measurement, were selected for further study. These four sensors were then used to measure the elbow and knee joint motions of human subjects by placing them on different locations on sleeves and legs. The CNT knit textile sensors best suited to measuring joint motions are those with a double-layered CNT knit and 5 cm long × 0.5 cm or 1 cm wide sensors attached to a polyester¬-based knit using a welding method. The best position for the sensor to more stably monitor joint motions was the “below hinge position” from the elbow or knee hinge joint. Our study suggests an alternative strategy for joint-motion measurement that could contribute to the development of more comfortable and human-friendly methods of human limb motion measurement.

Determining Normal for Upper and Lower Limb Motions

2012 ◽  
Vol 17 (2) ◽  
pp. 1-3
Author(s):  
Charles N. Brooks ◽  
Christopher R. Brigham
Keyword(s):  
Individual Variation ◽  
Lower Limb ◽  
Joint Motion ◽  
Multiple Factors ◽  
Joint Motions

Abstract Normal joint motions vary from one person to another and depend on multiple factors, which raises issues when evaluators attempt to address issues of causation and apportionment. Although the causation and apportionment of joint motion deficits were not addressed in the fourth and earlier editions of the AMA Guides to the Evaluation of Permanent Impairment (AMA Guides), the fifth and sixth editions took three possibilities into consideration when they provided instructions about how to evaluate impairment due to diminished mobility of upper and lower limb joints. Evaluating physicians must consider whether: 1) the motion deficit existed before the injury or illness in question or if the deficit was caused by individual variation, aging, disease, trauma, and/or other cause; 2) the motion deficit was caused by the injury or illness that is at issue or is in question; and 3) a lesser, pre-existing motion deficit existed before the current injury or illness was aggravated (permanently increased). Because of variations in normal joint motions among individuals, examiners should measure the motions of the uninvolved as well as the involved joints, using the former to define normal. Any motion impairment of the uninvolved joint is subtracted from that for the involved joint to determine the net impairment. Examples from the fifth and sixth editions show applications of the AMA Guides to two sample cases.

scholarly journals Validity and Reliability of the WIMUTM Inertial Device for the Assessment of Joint Angulations

2019 ◽  
Vol 17 (1) ◽  
pp. 193 ◽  
Author(s):  
Javier García-Rubio ◽  
José Pino ◽  
Pedro R. Olivares ◽  
Sergio J. Ibáñez
Keyword(s):  
Correlation Coefficient ◽  
Concurrent Validity ◽  
Intraclass Correlation ◽  
Angle Measurement ◽  
Ankle Dorsiflexion ◽  
Functional Evaluation ◽  
Joint Motion ◽  
Validity And Reliability ◽  
Reliable Instrument ◽  
Joint Motions

Range of motion measurement is fundamental in the physical examination and functional evaluation of different joints. WIMUTM is an inertial device that allows the analysis of joint motion easily in real time. This study had a two-fold goal: (i) to evaluate the validity of WIMUTM on the measurement of different angle positions, compared with a standard goniometer and 2D video-based motion analysis software; and (ii) to evaluate the use of WIMUTM in the assessment of angulations in a joint, specifically assessing the validity and reliability of WIMUTM on the measurement of ankle dorsiflexion, compared to a standard goniometer and Kinovea. The intraclass correlation coefficient and Pearson´s correlation coefficient (r) were performed to calculate the concurrent validity, and Bland-Altman plots were performed to analyze agreement between measures. For the analysis of reliability, both relative and absolute indices were used. The results showed excellent validity and reliability of WIMUTM in the assessment of angle positions and ankle dorsiflexion. The current findings conclude that WIMUTM is a valid and reliable instrument to measure angle and joint motions. In short, WIMUTM provides a new clinical and sportive method of angle measurement.

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