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https://www.readbyqxmd.com/read/29154694/gait-and-quiet-stance-performance-among-adolescents-after-concussion-symptom-resolution
#1
Justin Berkner, William P Meehan, Christina L Master, David R Howell
OBJECTIVE:   To prospectively examine adolescent athletes' gait and quiet-stance performance while concurrently completing a cognitive task acutely after concussion and after symptom resolution. SETTING:   Sport concussion clinic. DESIGN:   Participants diagnosed with a concussion completed a symptom inventory and single- and dual-task quiet-stance and gait evaluations within 21 days of injury and then again after symptom resolution...
November 20, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/29150746/correlation-between-quantitative-pivot-shift-and-generalized-joint-laxity-a-prospective-multicenter-study-of-acl-ruptures
#2
David Sundemo, Anna Blom, Yuichi Hoshino, Ryosuke Kuroda, Nicola Francesco Lopomo, Stefano Zaffagnini, Volker Musahl, James J Irrgang, Jón Karlsson, Kristian Samuelsson
PURPOSE: To investigate whether an increased magnitude of quantitative rotatory knee laxity is associated with a greater level of generalized joint laxity in ACL-injured and contralateral knees. METHODS: A total of 103 patients were enrolled across four international centers to undergo anatomic ACL reconstruction. Rotatory knee laxity was evaluated preoperatively, both in the awake state and under anesthesia, using the standardized pivot shift test. Two devices were used to quantify rotatory knee laxity; an inertial sensor, measuring the joint acceleration, and an image analysis system, measuring the lateral compartment translation of the tibia...
November 17, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29149063/estimating-stair-running-performance-using-inertial-sensors
#3
Lauro V Ojeda, Antonia M Zaferiou, Stephen M Cain, Rachel V Vitali, Steven P Davidson, Leia A Stirling, Noel C Perkins
Stair running, both ascending and descending, is a challenging aerobic exercise that many athletes, recreational runners, and soldiers perform during training. Studying biomechanics of stair running over multiple steps has been limited by the practical challenges presented while using optical-based motion tracking systems. We propose using foot-mounted inertial measurement units (IMUs) as a solution as they enable unrestricted motion capture in any environment and without need for external references. In particular, this paper presents methods for estimating foot velocity and trajectory during stair running using foot-mounted IMUs...
November 17, 2017: Sensors
https://www.readbyqxmd.com/read/29135966/monocular-visual-inertial-slam-continuous-preintegration-and-reliable-initialization
#4
Yi Liu, Zhong Chen, Wenjuan Zheng, Hao Wang, Jianguo Liu
In this paper, we propose a new visual-inertial Simultaneous Localization and Mapping (SLAM) algorithm. With the tightly coupled sensor fusion of a global shutter monocular camera and a low-cost Inertial Measurement Unit (IMU), this algorithm is able to achieve robust and real-time estimates of the sensor poses in unknown environment. To address the real-time visual-inertial fusion problem, we present a parallel framework with a novel IMU initialization method. Our algorithm also benefits from the novel IMU factor, the continuous preintegration method, the vision factor of directional error, the separability trick and the robust initialization criterion which can efficiently output reliable estimates in real-time on modern Central Processing Unit (CPU)...
November 14, 2017: Sensors
https://www.readbyqxmd.com/read/29132727/speed-profiles-in-wheelchair-court-sports-comparison-of-two-methods-for-measuring-wheelchair-mobility-performance
#5
R M A van der Slikke, B S Mason, M A M Berger, V L Goosey-Tolfrey
Wheelchair mobility performance is an important aspect in most wheelchair court sports, commonly measured with an indoor tracking system or wheelchair bound inertial sensors. Both methods provide key wheelchair mobility performance outcomes regarding speed. In this study, we compared speed profiles of both methods to gain insight into the level of agreement, for recommendations regarding future performance measurement. Data were obtained from 5 male highly trained wheelchair basketball players during match play...
November 10, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29127653/development-of-a-3d-workspace-shoulder-assessment-tool-incorporating-electromyography-and-an-inertial-measurement-unit-a-preliminary-study
#6
Navid Aslani, Siamak Noroozi, Philip Davenport, Richard Hartley, Mihai Dupac, Philip Sewell
Traditional shoulder range of movement (ROM) measurement tools suffer from inaccuracy or from long experimental setup times. Recently, it has been demonstrated that relatively low-cost wearable inertial measurement unit (IMU) sensors can overcome many of the limitations of traditional motion tracking systems. The aim of this study is to develop and evaluate a single IMU combined with an electromyography (EMG) sensor to monitor the 3D reachable workspace with simultaneous measurement of deltoid muscle activity across the shoulder ROM...
November 11, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29122186/accuracy-of-angular-displacements-and-velocities-from-inertial-based-inclinometers
#7
Howard Chen, Mark C Schall, Nathan Fethke
The objective of this study was to evaluate the accuracy of various sensor fusion algorithms for measuring upper arm elevation relative to gravity (i.e., angular displacement and velocity summary measures) across different motion speeds. Thirteen participants completed a cyclic, short duration, arm-intensive work task that involved transfering wooden dowels at three work rates (slow, medium, fast). Angular displacement and velocity measurements of upper arm elevation were simultaneously measured using an inertial measurement unit (IMU) and an optical motion capture (OMC) system...
February 2018: Applied Ergonomics
https://www.readbyqxmd.com/read/29117143/a-smartphone-step-counter-using-imu-and-magnetometer-for-navigation-and-health-monitoring-applications
#8
Maan Khedr, Nasser El-Sheimy
The growing market of smart devices make them appealing for various applications. Motion tracking can be achieved using such devices, and is important for various applications such as navigation, search and rescue, health monitoring, and quality of life-style assessment. Step detection is a crucial task that affects the accuracy and quality of such applications. In this paper, a new step detection technique is proposed, which can be used for step counting and activity monitoring for health applications as well as part of a Pedestrian Dead Reckoning (PDR) system...
November 8, 2017: Sensors
https://www.readbyqxmd.com/read/29114889/the-contribution-of-cochlear-implants-to-postural-stability
#9
Corey S Shayman, Martina Mancini, Tyler S Weaver, Laurie A King, Timothy E Hullar
OBJECTIVES: To determine whether spatial auditory cues provided by cochlear implants can improve postural balance in adults with severe deafness. METHODS: In the presence of spatial white noise, 13 adult cochlear implantees wore head and lumbar-mounted inertial sensors while standing in the dark for 30 seconds in two auditory conditions: hearing assistive devices on and off. RESULTS: Stability was improved with implants on (aided condition) compared to off (unaided condition) with respect to differences in mean head velocity (Cohen's d = 0...
November 8, 2017: Laryngoscope
https://www.readbyqxmd.com/read/29112143/adaptive-monocular-visual-inertial-slam-for-real-time-augmented-reality-applications-in-mobile-devices
#10
Jin-Chun Piao, Shin-Dug Kim
Simultaneous localization and mapping (SLAM) is emerging as a prominent issue in computer vision and next-generation core technology for robots, autonomous navigation and augmented reality. In augmented reality applications, fast camera pose estimation and true scale are important. In this paper, we present an adaptive monocular visual-inertial SLAM method for real-time augmented reality applications in mobile devices. First, the SLAM system is implemented based on the visual-inertial odometry method that combines data from a mobile device camera and inertial measurement unit sensor...
November 7, 2017: Sensors
https://www.readbyqxmd.com/read/29109379/development-of-a-shipboard-remote-control-and-telemetry-experimental-system-for-large-scale-model-s-motions-and-loads-measurement-in-realistic-sea-waves
#11
Jialong Jiao, Huilong Ren, Christiaan Adika Adenya, Chaohe Chen
Wave-induced motion and load responses are important criteria for ship performance evaluation. Physical experiments have long been an indispensable tool in the predictions of ship's navigation state, speed, motions, accelerations, sectional loads and wave impact pressure. Currently, majority of the experiments are conducted in laboratory tank environment, where the wave environments are different from the realistic sea waves. In this paper, a laboratory tank testing system for ship motions and loads measurement is reviewed and reported first...
October 29, 2017: Sensors
https://www.readbyqxmd.com/read/29100144/moving-from-laboratory-to-real-life-conditions-influence-on-the-assessment-of-variability-and-stability-of-gait
#12
Paola Tamburini, Fabio Storm, Chris Buckley, Maria Cristina Bisi, Rita Stagni, Claudia Mazzà
The availability of wearable sensors allows shifting gait analysis from the traditional laboratory settings, to daily life conditions. However, limited knowledge is available about whether alterations associated to different testing environment (e.g. indoor or outdoor) and walking protocols (e.g. free or controlled), result from actual differences in the motor behaviour of the tested subjects or from the sensitivity to these changes of the indexes adopted for the assessment. In this context, it was hypothesized that testing environment and walking protocols would not modify motor control stability in the gait of young healthy adults, who have a mature and structured gait pattern, but rather the variability of their motor pattern...
October 26, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29099807/loose-coupling-of-wearable-based-inss-with-automatic-heading-evaluation
#13
Dina Bousdar Ahmed, Estefania Munoz Diaz
Position tracking of pedestrians by means of inertial sensors is a highly explored field of research. In fact, there are already many approaches to implement inertial navigation systems (INSs). However, most of them use a single inertial measurement unit (IMU) attached to the pedestrian's body. Since wearable-devices will be given items in the future, this work explores the implementation of an INS using two wearable-based IMUs. A loosely coupled approach is proposed to combine the outputs of wearable-based INSs...
November 3, 2017: Sensors
https://www.readbyqxmd.com/read/29096266/mobile-assessment-of-the-lower-limb-kinematics-in-healthy-persons-and-in-persons-with-degenerative-knee-disorders-a-systematic-review
#14
REVIEW
R van der Straaten, L De Baets, I Jonkers, A Timmermans
Inertial sensor systems are increasingly used in the assessment of persons with knee osteoarthritis (KOA) and total knee replacement (TKR). This systematic review aims to (1) investigate the application of inertial sensor systems and kinematics derived from these systems, and (2) assess if current assessment protocols consist of tasks which are, according to the International Classification of Functioning, Disability and Health (ICF) for KOA, relevant for persons with KOA and TKR. A search was conducted in six electronic databases (ACM, CINAHL, EMBASE, IEEE, PubMed, Web of Science) to include papers assessing the knee and one or more adjacent joints by means of inertial sensors in healthy persons or persons with KOA or TKR...
October 5, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29091467/the-future-of-classification-in-wheelchair-sports-can-data-science-and-technological-advancement-offer-an-alternative-point-of-view
#15
Rienk M A van der Slikke, Daan J J Bregman, Monique A M Berger, Annemarie M H de Witte, Dirk-Jan H E J Veeger
PURPOSE: Classification is a defining factor for competition in wheelchair sports, but it is a delicate and time-consuming process with often questionable validity.(1) New inertial sensor based measurement methods applied in match play and field tests, allow for more precise and objective estimates of the impairment effect on wheelchair mobility performance. It was evaluated if these measures could offer an alternative point of view for classification. METHODS: Six standard wheelchair mobility performance outcomes of different classification groups were measured in match play (n=29), as well as best possible performance in a field test (n=47)...
November 1, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29078732/abnormal-turning-and-its-association-with-self-reported-symptoms-in-chronic-mtbi
#16
Peter C Fino, Lucy Parrington, Merissa Walls, Emily Sippel, Timothy E Hullar, James C Chesnutt, Laurie A King
Turning is common in daily activity and requires rapid, coordinated reorientation of the head and trunk, and pelvis towards the new direction of travel. Yet, turning gait has not been well explored in populations with mild traumatic brain injury (mTBI) who may alter their turning behavior according to self-perceived symptoms or motor dysfunction. The purpose of this study was to examine turning velocities and coordination in adults with chronic mTBI (>3 months post-injury and still reporting balance complaints) during a task simulating everyday ambulation...
October 27, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29074288/strategy-quantification-using-body-worn-inertial-sensors-in-a-reactive-agility-task
#17
Chika U Eke, Stephen M Cain, Leia A Stirling
Agility performance is often evaluated using time-based metrics, which provide little information about which factors aid or limit success. The objective of this study was to better understand agility strategy by identifying biomechanical metrics that were sensitive to performance speed, which were calculated with data from an array of body-worn inertial sensors. Five metrics were defined (normalized number of foot contacts, stride length variance, arm swing variance, mean normalized stride frequency, and number of body rotations) that corresponded to agility terms defined by experts working in athletic, clinical, and military environments...
October 7, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29072400/inertial-sensor-based-motion-analysis-of-lower-limbs-for-rehabilitation-treatments
#18
Tongyang Sun, Hua Li, Quanquan Liu, Lihong Duan, Meng Li, Chunbao Wang, Qihong Liu, Weiguang Li, Wanfeng Shang, Zhengzhi Wu, Yulong Wang
The hemiplegic rehabilitation state diagnosing performed by therapists can be biased due to their subjective experience, which may deteriorate the rehabilitation effect. In order to improve this situation, a quantitative evaluation is proposed. Though many motion analysis systems are available, they are too complicated for practical application by therapists. In this paper, a method for detecting the motion of human lower limbs including all degrees of freedom (DOFs) via the inertial sensors is proposed, which permits analyzing the patient's motion ability...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29065575/inertial-sensor-based-motion-analysis-of-lower-limbs-for-rehabilitation-treatments
#19
Tongyang Sun, Hua Li, Quanquan Liu, Lihong Duan, Meng Li, Chunbao Wang, Qihong Liu, Weiguang Li, Wanfeng Shang, Zhengzhi Wu, Yulong Wang
The hemiplegic rehabilitation state diagnosing performed by therapists can be biased due to their subjective experience, which may deteriorate the rehabilitation effect. In order to improve this situation, a quantitative evaluation is proposed. Though many motion analysis systems are available, they are too complicated for practical application by therapists. In this paper, a method for detecting the motion of human lower limbs including all degrees of freedom (DOFs) via the inertial sensors is proposed, which permits analyzing the patient's motion ability...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29065521/a-new-polar-transfer-alignment-algorithm-with-the-aid-of-a-star-sensor-and-based-on-an-adaptive-unscented-kalman-filter
#20
Jianhua Cheng, Tongda Wang, Lu Wang, Zhenmin Wang
Because of the harsh polar environment, the master strapdown inertial navigation system (SINS) has low accuracy and the system model information becomes abnormal. In this case, existing polar transfer alignment (TA) algorithms which use the measurement information provided by master SINS would lose their effectiveness. In this paper, a new polar TA algorithm with the aid of a star sensor and based on an adaptive unscented Kalman filter (AUKF) is proposed to deal with the problems. Since the measurement information provided by master SINS is inaccurate, the accurate information provided by the star sensor is chosen as the measurement...
October 23, 2017: Sensors
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