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https://www.readbyqxmd.com/read/29028626/accuracy-of-three-methods-in-gait-event-detection-during-overground-running
#1
Shiwei Mo, Daniel H K Chow
Inertial measurement units (IMUs) have been extensively used to detect gait events. Various methods have been proposed for detecting initial contact (IC) and toe-off (TO) using IMUs affixed at various anatomical locations. However, the accuracy of such methods has yet to be compared. This study evaluated the accuracy of three common methods used for detecting gait events during jogging and running: (1) S-method, in which IC is identified as the instant of peak foot-resultant acceleration and TO is identified when the acceleration exceeds a threshold of 2g in the region of interest; (2) M-method, in which IC and TO are defined as the minimum before the positive peak shank vertical acceleration and the minimum in the region of interest, respectively; and (3) L-method, in which IC is indicated by the instant of peak pelvis anteroposterior acceleration and TO is identified by the maximum in the region of interest...
October 6, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28974355/improve-elderly-people-s-sit-to-stand-ability-by-using-new-designed-additional-armrests-attaching-on-the-standard-walker
#2
Chih-Kang Chang, Yu-Yang Lin, Pei-Chun Wong, Hung-Chan Kao, Hsin-Yu Chen, Si-Huei Lee, Cheng-Kung Cheng
BACKGROUND: More and more elderly problems come to our life and the elderly health care become more important. Elderly people with lower extremities weakness usually use walkers to assist in walking. Although the commercial standard walkers (N-type) can improve elderly people's walking ability, users sometimes take risk of falling when using the standard walkers to perform sit-to-stand (STS). The purpose of this study is to design an additional armrest which can be attached to a standard walker for users performing STS more easily and evaluate it with clinical assessments and a body worn sensor...
September 30, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28965752/analysis-and-design-of-second-order-sliding-mode-algorithms-for-quadrotor-roll-and-pitch-estimation
#3
Jing Chang, Jérôme Cieslak, Jorge Dávila, Ali Zolghadri, Jun Zhou
The problem addressed in this paper is that of quadrotor roll and pitch estimation without any assumption about the knowledge of perturbation bounds when Inertial Measurement Units (IMU) data or position measurements are available. A Smooth Sliding Mode (SSM) algorithm is first designed to provide reliable estimation under a smooth disturbance assumption. This assumption is next relaxed with the second proposed Adaptive Sliding Mode (ASM) algorithm that deals with disturbances of unknown bounds. In addition, the analysis of the observers are extended to the case where measurements are corrupted by bias and noise...
September 28, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28934102/pose-estimation-of-a-mobile-robot-based-on-fusion-of-imu-data-and-vision-data-using-an-extended-kalman-filter
#4
Mary B Alatise, Gerhard P Hancke
Using a single sensor to determine the pose estimation of a device cannot give accurate results. This paper presents a fusion of an inertial sensor of six degrees of freedom (6-DoF) which comprises the 3-axis of an accelerometer and the 3-axis of a gyroscope, and a vision to determine a low-cost and accurate position for an autonomous mobile robot. For vision, a monocular vision-based object detection algorithm speeded-up robust feature (SURF) and random sample consensus (RANSAC) algorithms were integrated and used to recognize a sample object in several images taken...
September 21, 2017: Sensors
https://www.readbyqxmd.com/read/28928711/validation-of-a-step-detection-algorithm-during-straight-walking-and-turning-in-patients-with-parkinson-s-disease-and-older-adults-using-an-inertial-measurement-unit-at-the-lower-back
#5
Minh H Pham, Morad Elshehabi, Linda Haertner, Silvia Del Din, Karin Srulijes, Tanja Heger, Matthis Synofzik, Markus A Hobert, Gert S Faber, Clint Hansen, Dina Salkovic, Joaquim J Ferreira, Daniela Berg, Álvaro Sanchez-Ferro, Jaap H van Dieën, Clemens Becker, Lynn Rochester, Gerhard Schmidt, Walter Maetzler
INTRODUCTION: Inertial measurement units (IMUs) positioned on various body locations allow detailed gait analysis even under unconstrained conditions. From a medical perspective, the assessment of vulnerable populations is of particular relevance, especially in the daily-life environment. Gait analysis algorithms need thorough validation, as many chronic diseases show specific and even unique gait patterns. The aim of this study was therefore to validate an acceleration-based step detection algorithm for patients with Parkinson's disease (PD) and older adults in both a lab-based and home-like environment...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28927995/measuring-system-for-an-attitude-angle-of-a-denture-using-an-inertial-measurement-unit
#6
Toshiaki Sekita, Syuhei Takeuchi, Syunsuke Minakuchi
PURPOSE: The aim of this study was to assemble and verify a measuring system for 3-D movements (attitude angle) of the denture during function. METHODS: For the calibration test, the sensor was fixed at the center of the rotary table. Operation and stopping of the rotary table were repeated 8 times, and the direction of rotation was reversed in the middle. The amount of rotation was 1.2 and 2.4°. As a pilot clinical trial, the attitude angles of three upper complete dentures during tapping were measured by this system...
September 15, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28926996/a-robust-vehicle-localization-approach-based-on-gnss-imu-dmi-lidar-sensor-fusion-for-autonomous-vehicles
#7
Xiaoli Meng, Heng Wang, Bingbing Liu
Precise and robust localization in a large-scale outdoor environment is essential for an autonomous vehicle. In order to improve the performance of the fusion of GNSS (Global Navigation Satellite System)/IMU (Inertial Measurement Unit)/DMI (Distance-Measuring Instruments), a multi-constraint fault detection approach is proposed to smooth the vehicle locations in spite of GNSS jumps. Furthermore, the lateral localization error is compensated by the point cloud-based lateral localization method proposed in this paper...
September 18, 2017: Sensors
https://www.readbyqxmd.com/read/28925984/a-robust-inner-and-outer-loop-control-method-for-trajectory-tracking-of-a-quadrotor
#8
Dunzhu Xia, Limei Cheng, Yanhong Yao
In order to achieve the complicated trajectory tracking of quadrotor, a geometric inner and outer loop control scheme is presented. The outer loop generates the desired rotation matrix for the inner loop. To improve the response speed and robustness, a geometric SMC controller is designed for the inner loop. The outer loop is also designed via sliding mode control (SMC). By Lyapunov theory and cascade theory, the closed-loop system stability is guaranteed. Next, the tracking performance is validated by tracking three representative trajectories...
September 19, 2017: Sensors
https://www.readbyqxmd.com/read/28910754/a-phase-variable-approach-for-imu-based-locomotion-activity-recognition
#9
Harrison L Bartlett, Michael Goldfarb
OBJECTIVE: This paper describes a gait classification method which utilizes measured motion of the thigh segment provided by an inertial measurement unit (IMU). METHODS: The classification method employs a phase-variable description of gait, and identifies a given activity based on the expected curvature characteristics of that activity over a gait cycle. The classification method was tested in experiments conducted with seven healthy subjects performing three different locomotor activities: level ground walking, stair descent, and stair ascent...
September 8, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28885155/a-nonlinear-dynamics-based-estimator-for-functional-electrical-stimulation-preliminary-results-from-lower-leg-extension-experiments
#10
Marcus Allen, Qiang Zhong, Nicholas Kirsch, Ashwin Dani, William W Clark, Nitin Sharma
Miniature inertial measurement units (IMUs) are wearable sensors that measure limb segment or joint angles during dynamic movements. However, IMUs are generally prone to drift, external magnetic interference, and measurement noise. This paper presents a new class of nonlinear state estimation technique called state-dependent coefficient (SDC) estimation to accurately predict joint angles from IMU measurements. The SDC estimation method uses limb dynamics, instead of limb kinematics, to estimate the limb state...
September 7, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28872371/reliability-of-wearable-inertial-measurement-units-to-measure-physical-activity-in-team-handball
#11
Live S Luteberget, Benjamin R Holme, Matt Spencer
PURPOSE: The purpose of this study was to assess the reliability and sensitivity of commercially available inertial measurement units (IMU) to measure physical activity in team handball. METHOD: Twenty-two handball players were instrumented with two IMUs (OptimEye S5, Catapult Sports, Australia) taped together. They participated in either a laboratory assessment (n=10), consisting of seven team handball specific tasks, or field assessment (n=12) conducted in twelve training sessions...
September 5, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28862665/wearable-devices-for-classification-of-inadequate-posture-at-work-using-neural-networks
#12
Eya Barkallah, Johan Freulard, Martin J-D Otis, Suzy Ngomo, Johannes C Ayena, Christian Desrosiers
Inadequate postures adopted by an operator at work are among the most important risk factors in Work-related Musculoskeletal Disorders (WMSDs). Although several studies have focused on inadequate posture, there is limited information on its identification in a work context. The aim of this study is to automatically differentiate between adequate and inadequate postures using two wearable devices (helmet and instrumented insole) with an inertial measurement unit (IMU) and force sensors. From the force sensors located inside the insole, the center of pressure (COP) is computed since it is considered an important parameter in the analysis of posture...
September 1, 2017: Sensors
https://www.readbyqxmd.com/read/28858808/using-inertial-sensors-to-automatically-detect-and-segment-activities-of-daily-living-in-people-with-parkinson-s-disease
#13
Hung Nguyen, Karina Lebel, Sarah Bogard, Etienne Goubault, Patrick Boissy, Qpn Clinicians, Christian Duval
Wearable sensors such as Inertial Measuring Units (IMUs) have been widely used to measure the quantity of physical activities during daily living in healthy and people with movement disorders through activity classification. These sensors have the potential to provide valuable information to evaluate the quality of the movement during activities of daily living (ADL) such as walking, sitting down and standing up, which could help clinicians to monitor rehabilitation and pharmaceutical interventions. However, high accuracy in the detection and segmentation of these activities is necessary for proper evaluation of the quality of the performance within a given segment...
August 25, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28851485/recalmin-ii-eight-years-of-hospitalisation-in-internal-medicine-units-2007-2014-what-has-changed
#14
A Zapatero-Gaviria, R Barba-Martín, J Canora Lebrato, C Fernández-Pérez, R Gómez-Huelgas, J L Bernal-Sobrino, J Díaz-Manglano, J Marco-Martínez, F J Elola-Somoza
OBJECTIVES: To analyse the evolution of care provided by the internal medicine units (IMU) of the Spanish National Health System from 2007 to 2014. MATERIAL AND METHODS: We analysed all discharges from the IMU of the Spanish National Health System in 2007 and 2014, using the Minimum Basic Data Set. We compared the risk factors by episode, mortality and readmissions between the two periods. We prepared specific fits for the risk for mortality and readmissions in heart failure, pneumonia and chronic obstructive pulmonary disease, as well as the Charlson index for all activity...
August 26, 2017: Revista Clínica Española
https://www.readbyqxmd.com/read/28846613/method-for-estimating-three-dimensional-knee-rotations-using-two-inertial-measurement-units-validation-with-a-coordinate-measurement-machine
#15
Rachel V Vitali, Stephen M Cain, Ryan S McGinnis, Antonia M Zaferiou, Lauro V Ojeda, Steven P Davidson, Noel C Perkins
Three-dimensional rotations across the human knee serve as important markers of knee health and performance in multiple contexts including human mobility, worker safety and health, athletic performance, and warfighter performance. While knee rotations can be estimated using optical motion capture, that method is largely limited to the laboratory and small capture volumes. These limitations may be overcome by deploying wearable inertial measurement units (IMUs). The objective of this study is to present a new IMU-based method for estimating 3D knee rotations and to benchmark the accuracy of the results using an instrumented mechanical linkage...
August 27, 2017: Sensors
https://www.readbyqxmd.com/read/28841142/validation-of-a-high-sampling-rate-inertial-measurement-unit-for-acceleration-during-running
#16
Thomas Provot, Xavier Chiementin, Emeric Oudin, Fabrice Bolaers, Sébastien Murer
The musculo-skeletal response of athletes to various activities during training exercises has become a critical issue in order to optimize their performance and minimize injuries. However, dynamic and kinematic measures of an athlete's activity are generally limited by constraints in data collection and technology. Thus, the choice of reliable and accurate sensors is crucial for gathering data in indoor and outdoor conditions. The aim of this study is to validate the use of the accelerometer of a high sampling rate ( 1344 Hz ) Inertial Measurement Unit (IMU) in the frame of running activities...
August 25, 2017: Sensors
https://www.readbyqxmd.com/read/28830590/the-use-of-a-single-inertial-sensor-to-estimate-3-dimensional-ground-reaction-force-during-accelerative-running-tasks
#17
Reed D Gurchiek, Ryan S McGinnis, Alan R Needle, Jeffrey M McBride, Herman van Werkhoven
The purpose of this investigation was to determine the feasibility of using a single inertial measurement unit (IMU) placed on the sacrum to estimate 3-dimensional ground reaction force (F) during linear acceleration and change of direction tasks. Force plate measurements of F and estimates from the proposed IMU method were collected while subjects (n=15) performed a standing sprint start (SS) and a 45° change of direction task (COD). Error in the IMU estimate of step-averaged component and resultant F was quantified by comparison to estimates from the force plate using Bland-Altman 95% limits of agreement (LOA), root mean square error (RMSE), Pearson's product-moment correlation coefficient (r), and the effect size (ES) of the differences between the two systems...
August 16, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28827210/mobile-app-to-streamline-the-development-of-wearable-sensor-based-exercise-biofeedback-systems-system-development-and-evaluation
#18
Martin O'Reilly, Joe Duffin, Tomas Ward, Brian Caulfield
BACKGROUND: Biofeedback systems that use inertial measurement units (IMUs) have been shown recently to have the ability to objectively assess exercise technique. However, there are a number of challenges in developing such systems; vast amounts of IMU exercise datasets must be collected and manually labeled for each exercise variation, and naturally occurring technique deviations may not be well detected. One method of combatting these issues is through the development of personalized exercise technique classifiers...
August 21, 2017: JMIR Rehabil Assist Technol
https://www.readbyqxmd.com/read/28814017/assessment-of-lower-arm-movements-using-one-inertial-sensor
#19
Fokke B van Meulen, Bert-Jan F van Beijnum, Jaap H Buurke, Peter H Veltink
Reduction of the number of sensors needed to evaluate arm movements, makes a system for the assessment of human body movements more suitable for clinical practice and daily life assessments. In this study, we propose an algorithm to reconstruct lower arm orientation, velocity and position, based on a sensing system which consists of only one inertial measurement unit (IMU) to the forearm. Lower arm movements were reconstructed using a single IMU and assuming that within a measurement there are moments without arm movements...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814009/preliminary-results-toward-a-naturally-controlled-multi-synergistic-prosthetic-hand
#20
Matteo Rossi, Cosimo Della Santina, Cristina Piazza, Giorgio Grioli, Manuel Catalano, Antonio Biechi
Robotic hands embedding human motor control principles in their mechanical design are getting increasing interest thanks to their simplicity and robustness, combined with good performance. Another key aspect of these hands is that humans can use them very effectively thanks to the similarity of their behavior with real hands. Nevertheless, controlling more than one degree of actuation remains a challenging task. In this paper, we take advantage of these characteristics in a multi-synergistic prosthesis. We propose an integrated setup composed of Pisa/IIT SoftHand 2 and a control strategy which simultaneously and proportionally maps the human hand movements to the robotic hand...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
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