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https://www.readbyqxmd.com/read/28638335/quantification-of-head-movement-predictability-and-implications-for-suppression-of-vestibular-input-during-locomotion
#1
Paul R MacNeilage, Stefan Glasauer
Achieved motor movement can be estimated using both sensory and motor signals. The value of motor signals for estimating movement should depend critically on the stereotypy or predictability of the resulting actions. As predictability increases, motor signals become more reliable indicators of achieved movement, so weight attributed to sensory signals should decrease accordingly. Here we describe a method to quantify this predictability for head movement during human locomotion by measuring head motion with an inertial measurement unit (IMU), and calculating the variance explained by the mean movement over one stride, i...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28629191/a-new-filtering-and-smoothing-algorithm-for-railway-track-surveying-based-on-landmark-and-imu-odometer
#2
Qingan Jiang, Wenqi Wu, Mingming Jiang, Yun Li
High-accuracy railway track surveying is essential for railway construction and maintenance. The traditional approaches based on total station equipment are not efficient enough since high precision surveying frequently needs static measurements. This paper proposes a new filtering and smoothing algorithm based on the IMU/odometer and landmarks integration for the railway track surveying. In order to overcome the difficulty of estimating too many error parameters with too few landmark observations, a new model with completely observable error states is established by combining error terms of the system...
June 19, 2017: Sensors
https://www.readbyqxmd.com/read/28617338/indoor-autonomous-control-of-a-two-wheeled-inverted-pendulum-vehicle-using-ultra-wide-band-technology
#3
Dunzhu Xia, Yanhong Yao, Limei Cheng
In this paper, we aimed to achieve the indoor tracking control of a two-wheeled inverted pendulum (TWIP) vehicle. The attitude data are acquired from a low cost micro inertial measurement unit (IMU), and the ultra-wideband (UWB) technology is utilized to obtain an accurate estimation of the TWIP's position. We propose a dual-loop control method to realize the simultaneous balance and trajectory tracking control for the TWIP vehicle. A robust adaptive second-order sliding mode control (2-RASMC) method based on an improved super-twisting (STW) algorithm is investigated to obtain the control laws, followed by several simulations to verify its robustness...
June 15, 2017: Sensors
https://www.readbyqxmd.com/read/28612890/technology-in-rehabilitation-comparing-personalised-and-global-classification-methodologies-in-evaluating-the-squat-exercise-with-wearable-imus
#4
Martin A O'Reilly, Darragh Whelan, Tomás E Ward, Eamonn Delahunt, Brian Caulfield
BACKGROUND: The barbell squat is a popularly used lower limb rehabilitation exercise. It is also an integral exercise in injury risk screening protocols. To date athlete/patient technique has been assessed using expensive laboratory equipment or subjective clinical judgement; both of which are not without shortcomings. Inertial measurement units (IMUs) may offer a low cost solution for the objective evaluation of athlete/patient technique. However, it is not yet known if global classification techniques are effective in identifying naturally occurring, minor deviations in barbell squat technique...
June 14, 2017: Methods of Information in Medicine
https://www.readbyqxmd.com/read/28587178/survey-of-motion-tracking-methods-based-on-inertial-sensors-a-focus-on-upper-limb-human-motion
#5
REVIEW
Alessandro Filippeschi, Norbert Schmitz, Markus Miezal, Gabriele Bleser, Emanuele Ruffaldi, Didier Stricker
Motion tracking based on commercial inertial measurements units (IMUs) has been widely studied in the latter years as it is a cost-effective enabling technology for those applications in which motion tracking based on optical technologies is unsuitable. This measurement method has a high impact in human performance assessment and human-robot interaction. IMU motion tracking systems are indeed self-contained and wearable, allowing for long-lasting tracking of the user motion in situated environments. After a survey on IMU-based human tracking, five techniques for motion reconstruction were selected and compared to reconstruct a human arm motion...
June 1, 2017: Sensors
https://www.readbyqxmd.com/read/28578138/static-and-dynamic-validation-of-inertial-measurement-units
#6
Leah Taylor, Emily Miller, Kenton R Kaufman
Optical motion capture systems are used to assess human motion. While these systems provide a reliable analysis, they limit collection to a laboratory based setting. Devices such as Inertial Measurement Units (IMUs) have been developed as alternative tools. Commercially available IMUs are utilized for a variety of applications; however limited work has been done to determine the reliability of these devices. The objective of this study was to assess the accuracy and precision of a commercially available IMU, containing tri-axial accelerometers, gyroscopes, and magnetometers, under controlled static and dynamic conditions...
May 26, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28574474/a-lidar-and-imu-integrated-indoor-navigation-system-for-uavs-and-its-application-in-real-time-pipeline-classification
#7
G Ajay Kumar, Ashok Kumar Patil, Rekha Patil, Seong Sill Park, Young Ho Chai
Mapping the environment of a vehicle and localizing a vehicle within that unknown environment are complex issues. Although many approaches based on various types of sensory inputs and computational concepts have been successfully utilized for ground robot localization, there is difficulty in localizing an unmanned aerial vehicle (UAV) due to variation in altitude and motion dynamics. This paper proposes a robust and efficient indoor mapping and localization solution for a UAV integrated with low-cost Light Detection and Ranging (LiDAR) and Inertial Measurement Unit (IMU) sensors...
June 2, 2017: Sensors
https://www.readbyqxmd.com/read/28574471/a-map-ins-wi-fi-integrated-system-for-indoor-location-based-service-applications
#8
Chunyang Yu, Haiyu Lan, Fuqiang Gu, Fei Yu, Naser El-Sheimy
In this research, a new Map/INS/Wi-Fi integrated system for indoor location-based service (LBS) applications based on a cascaded Particle/Kalman filter framework structure is proposed. Two-dimension indoor map information, together with measurements from an inertial measurement unit (IMU) and Received Signal Strength Indicator (RSSI) value, are integrated for estimating positioning information. The main challenge of this research is how to make effective use of various measurements that complement each other in order to obtain an accurate, continuous, and low-cost position solution without increasing the computational burden of the system...
June 2, 2017: Sensors
https://www.readbyqxmd.com/read/28555124/observational-study-of-180%C3%A2-turning-strategies-using-inertial-measurement-units-and-fall-risk-in-poststroke-hemiparetic-patients
#9
Rémi Pierre-Marie Barrois, Damien Ricard, Laurent Oudre, Leila Tlili, Clément Provost, Aliénor Vienne, Pierre-Paul Vidal, Stéphane Buffat, Alain P Yelnik
OBJECTIVE: We analyzed spontaneous 180° turning strategies in poststroke hemiparetic patients by using inertial measurement units (IMUs) and the association of turning strategies with risk of falls. METHODS: We included right paretic (RP) and left paretic (LP) post-stroke patients, and healthy controls (HCs) from a physical and rehabilitation department in France between July 2015 and October 2015. All subjects were right-handed and right-footed for mobilization tasks...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28545824/classification-of-deadlift-biomechanics-with-wearable-inertial-measurement-units
#10
Martin A O'Reilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian M Caulfield
The deadlift is a compound full-body exercise that is fundamental in resistance training, rehabilitation programs and powerlifting competitions. Accurate quantification of deadlift biomechanics is important to reduce the risk of injury and ensure training and rehabilitation goals are achieved. This study sought to develop and evaluate deadlift exercise technique classification systems utilising Inertial Measurement Units (IMUs), recording at 51.2Hz, worn on the lumbar spine, both thighs and both shanks. It also sought to compare classification quality when these IMUs are worn in combination and in isolation...
May 16, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28541515/recalmin-the-association-between-management-of-spanish-national-health-service-internal-medical-units-and-health-outcomes
#11
Antonio Zapatero-Gaviria, Francisco Javier Elola-Somoza, Emilio Casariego-Vales, Cristina Fernandez-Perez, Ricardo Gomez-Huelgas, José Luis Bernal, Raquel Barba-Martín
Objective: To investigate the association between management of Internal Medical Units (IMUs) with outcomes (mortality and length of stay) within the Spanish National Health Service. Design: Data on management were obtained from a descriptive transversal study performed among IMUs of the acute hospitals. Outcome indicators were taken from an administrative database of all hospital discharges from the IMUs. Setting: Spanish National Health Service...
May 24, 2017: International Journal for Quality in Health Care
https://www.readbyqxmd.com/read/28538326/technology-in-strength-and-conditioning-tracking-lower-limb-exercises-with-wearable-sensors
#12
Martin A OʼReilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian Caulfield
Strength and conditioning (S&C) coaches offer expert guidance to help those they work with achieve their personal fitness goals. However, because of cost and availability issues, individuals are often left training without expert supervision. Recent developments in inertial measurement units (IMUs) and mobile computing platforms have allowed for the possibility of unobtrusive motion tracking systems and the provision of real-time individualized feedback regarding exercise performance. These systems could enable S&C coaches to remotely monitor sessions and help gym users record workouts...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28534857/optimization-based-sensor-fusion-of-gnss-and-imu-using-a-moving-horizon-approach
#13
Fabian Girrbach, Jeroen D Hol, Giovanni Bellusci, Moritz Diehl
The rise of autonomous systems operating close to humans imposes new challenges in terms of robustness and precision on the estimation and control algorithms. Approaches based on nonlinear optimization, such as moving horizon estimation, have been shown to improve the accuracy of the estimated solution compared to traditional filter techniques. This paper introduces an optimization-based framework for multi-sensor fusion following a moving horizon scheme. The framework is applied to the often occurring estimation problem of motion tracking by fusing measurements of a global navigation satellite system receiver and an inertial measurement unit...
May 19, 2017: Sensors
https://www.readbyqxmd.com/read/28523981/classification-of-lunge-biomechanics-with-multiple-and-individual-inertial-measurement-units
#14
Martin A O'Reilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian Caulfield
Lunges are a common, compound lower limb resistance exercise. If completed with aberrant technique, the increased stress on the joints used may increase risk of injury. This study sought to first investigate the ability of inertial measurement units (IMUs), when used in isolation and combination, to (a) classify acceptable and aberrant lunge technique (b) classify exact deviations in lunge technique. We then sought to investigate the most important features and establish the minimum number of top-ranked features and decision trees that are needed to maintain maximal system classification efficacy...
May 19, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28502401/effect-of-local-magnetic-field-disturbances-on-inertial-measurement-units-accuracy
#15
Xavier Robert-Lachaine, Hakim Mecheri, Christian Larue, André Plamondon
Inertial measurement units (IMUs), a practical motion analysis technology for field acquisition, have magnetometers to improve segment orientation estimation. However, sensitivity to magnetic disturbances can affect their accuracy. The objective of this study was to determine the joint angles accuracy of IMUs under different timing of magnetic disturbances of various durations and to evaluate a few correction methods. Kinematics from 12 individuals were obtained simultaneously with an Xsens system where an Optotrak cluster acting as the reference system was affixed to each IMU...
September 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28461079/-reproducibility-of-quantifying-timed-up-and-go-test-measured-with-smartphone-accelerometers-in-older-people-living-in-the-community
#16
Jorge Campillay Guzmán, Ricardo Guzmán Silva, Rodrigo Guzmán-Venegas
INTRODUCTION: Inertial Measurement Units (IMU) incorporated in smartphones can provide records that match registers obtained by laboratory instruments. This means that the use of smartphones would be feasible for recording three-dimensional kinematics parameters like velocity and acceleration, enabling more robust analyses, such as the Timed Up and Go (TUG) test, that assess the risk of falls older people (OP) living in the community. METHOD: The study included 35 female OP, users of the Family Health Centres (CESFAM) Juan Pablo II and Corvallis from Antofagasta city, Chile...
April 28, 2017: Revista Española de Geriatría y Gerontología
https://www.readbyqxmd.com/read/28449471/one-year-and-long-term-mortality-in-patients-hospitalized-for-chronic-obstructive-pulmonary-disease
#17
María-Teresa García-Sanz, Juan-Carlos Cánive-Gómez, Laura Senín-Rial, Jorge Aboal-Viñas, Alejandra Barreiro-García, Eva López-Val, Francisco-Javier González-Barcala
BACKGROUND: Chronic obstructive pulmonary disease (COPD) is a major cause of morbidity and mortality worldwide. Identifying potentially-modifiable predictors of mortality could help optimize COPD patient management. The aim of this study is to determine long-term mortality following hospitalization due to acute exacerbations of COPD (AECOPD), as well as AECOPD mortality predictors. METHODS: We conducted a retrospective study by reviewing the medical records of all patients admitted with AECOPD in the University Hospital Complex of Santiago de Compostela in 2007 and 2008...
March 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28441748/convergent-validity-of-a-wearable-sensor-system-for-measuring-sub-task-performance-during-the-timed-up-and-go-test
#18
James Beyea, Chris A McGibbon, Andrew Sexton, Jeremy Noble, Colleen O'Connell
BACKGROUND: The timed-up-and-go test (TUG) is one of the most commonly used tests of physical function in clinical practice and for research outcomes. Inertial sensors have been used to parse the TUG test into its composite phases (rising, walking, turning, etc.), but have not validated this approach against an optoelectronic gold-standard, and to our knowledge no studies have published the minimal detectable change of these measurements. METHODS: Eleven adults performed the TUG three times each under normal and slow walking conditions, and 3 m and 5 m walking distances, in a 12-camera motion analysis laboratory...
April 23, 2017: Sensors
https://www.readbyqxmd.com/read/28441425/role-of-route-previewing-strategies-on-climbing-fluency-and-exploratory-movements
#19
Ludovic Seifert, Romain Cordier, Dominic Orth, Yoan Courtine, James L Croft
This study examined the role of route previewing strategies on climbing fluency and on exploratory movements of the limbs, in order to understand whether previewing helps people to perceive and to realize affordances. Eight inexperienced and ten experienced climbers previewed a 10 m high route of 5b difficulty on French scale, then climbed it with a top-rope as fluently as possible. Gaze behavior was collected from an eye tracking system during the preview and allowed us to determine the number of times they scanned the route, and which of four route previewing strategies (fragmentary, ascending, zigzagging, and sequence-of-blocks) they used...
2017: PloS One
https://www.readbyqxmd.com/read/28433867/validity-and-repeatability-of-inertial-measurement-units-for-measuring-gait-parameters
#20
Edward P Washabaugh, Tarun Kalyanaraman, Peter G Adamczyk, Edward S Claflin, Chandramouli Krishnan
Inertial measurement units (IMUs) are small wearable sensors that have tremendous potential to be applied to clinical gait analysis. They allow objective evaluation of gait and movement disorders outside the clinic and research laboratory, and permit evaluation on large numbers of steps. However, repeatability and validity data of these systems are sparse for gait metrics. The purpose of this study was to determine the validity and between-day repeatability of spatiotemporal metrics (gait speed, stance percent, swing percent, gait cycle time, stride length, cadence, and step duration) as measured with the APDM Opal IMUs and Mobility Lab system...
April 12, 2017: Gait & Posture
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