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https://www.readbyqxmd.com/read/28809669/muscle-activation-and-inertial-motion-data-for-non-invasive-classification-of-activities-of-daily-living
#1
Michael S Totty, Eric Wade
OBJECTIVE: Remote monitoring of physical activity using body-worn sensors provides an objective alternative to current functional assessment tools. The purpose of this study was to assess the feasibility of classifying categories of activities of daily living from the Functional Arm Activity Behavioral Observation System (FAABOS) using muscle activation and motion data. METHODS: Ten non-disabled, healthy adults were fitted with a Myo armband on the upper forearm...
August 10, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28806627/a-novel-clinical-evaluation-method-using-maximum-angular-velocity-during-knee-extension-to-assess-lower-extremity-muscle-function-of-older-adults
#2
Takeshi Arai, Shuichi Obuchi, Yoshitaka Shiba
The purpose of this study is to examine the utilities of maximum angular velocity (AV) assessment during knee extension (KE) using a gyroscope for clinical evaluation of exercise program for older adults. Two hundred and 4 community-dwelling older adults underwent a 3-month exercise intervention program. Outcome measures included AV during KE and other physical functions (isometric strength (IS), walking abilities, and balance functions). A correlation coefficient was used to evaluate the relationships between AV and other physical functions at baseline...
August 3, 2017: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/28754888/gyrocardiography-a-new-non-invasive-monitoring-method-for-the-assessment-of-cardiac-mechanics-and-the-estimation-of-hemodynamic-variables
#3
Mojtaba Jafari Tadi, Eero Lehtonen, Antti Saraste, Jarno Tuominen, Juho Koskinen, Mika Teräs, Juhani Airaksinen, Mikko Pänkäälä, Tero Koivisto
Gyrocardiography (GCG) is a new non-invasive technique for assessing heart motions by using a sensor of angular motion - gyroscope - attached to the skin of the chest. In this study, we conducted simultaneous recordings of electrocardiography (ECG), GCG, and echocardiography in a group of subjects consisting of nine healthy volunteer men. Annotation of underlying fiducial points in GCG is presented and compared to opening and closing points of heart valves measured by a pulse wave Doppler. Comparison between GCG and synchronized tissue Doppler imaging (TDI) data shows that the GCG signal is also capable of providing temporal information on the systolic and early diastolic peak velocities of the myocardium...
July 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28754335/reliability-assessment-of-measuring-active-wrist-pronation-and-supination-range-of-motion-with-a-smartphone
#4
C Santos, N Pauchard, A Guilloteau
This study aimed to improve clinical examination techniques by determining the reliability of different methods to evaluate forearm movements. Two methods using the iPhone™ 5 and its gyroscope application (alone [I5] or attached to a selfie stick [ISS]) were compared with two conventional measurement devices (a plastic goniometer with a hand-held pencil [HHP] and a bubble goniometer [BG]) to evaluate the active range of movement (AROM) of the wrist during pronation and supination. Two independent groups of subjects took part in this prospective single-center diagnostic study: 20 healthy subjects and 20 patients...
July 25, 2017: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/28729643/superhydrophobic-drag-reduction-spherical-bearing-fabricated-by-laser-ablation-and-pei-regulated-zno-nanowire-growth
#5
Rui Weng, Haifeng Zhang, Yanjing Tuo, Yang Wang, Xiaowei Liu
The resistance of the bearing is a significant factor affecting the performance of the ball-disk rotor gyroscope. The micro and nano combined surface with low surface energy material modifications can be hydrophobic. This can reduce the drag when the bearing is lubricated by deionized water. Laser ablation method is utilized to form micron-scaled structures on the surface of the stainless steel rotor ball. And the nanostructures are formed by PEI (Polyetherimide) regulated ZnO nanowires growth. After low surface energy material modification, the water contact angle of processed surface was 163° and the sliding angle was less than 4°...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28692836/multi-body-dynamic-coupling-mechanism-for-generating-throwing-arm-velocity-during-baseball-pitching
#6
Kozo Naito, Tokio Takagi, Hideaki Kubota, Takeo Maruyama
The purpose of this study was to identify the detailed mechanism how the maximum throwing arm endpoint velocity is determined by the muscular torques and non-muscular interactive torques from the perspective of the dynamic coupling among the trunk, thorax and throwing and non-throwing arm segments. The pitching movements of ten male collegiate baseball pitchers were measured by a three-dimensional motion capture system. Using the induced-segmental velocity analysis (IVA) developed in this study, the maximum fingertip velocity of the throwing arm (MFV) was decomposed into each contribution of the muscular torques, passive motion-dependent torques due to gyroscopic moment, Coriolis force and centrifugal force, and other interactive torque components...
July 7, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28678808/validation-of-accuracy-of-svm-based-fall-detection-system-using-real-world-fall-and-non-fall-datasets
#7
Omar Aziz, Jochen Klenk, Lars Schwickert, Lorenzo Chiari, Clemens Becker, Edward J Park, Greg Mori, Stephen N Robinovitch
Falls are a major cause of injuries and deaths in older adults. Even when no injury occurs, about half of all older adults who fall are unable to get up without assistance. The extended period of lying on the floor often leads to medical complications, including muscle damage, dehydration, anxiety and fear of falling. Wearable sensor systems incorporating accelerometers and/or gyroscopes are designed to prevent long lies by automatically detecting and alerting care providers to the occurrence of a fall. Research groups have reported up to 100% accuracy in detecting falls in experimental settings...
2017: PloS One
https://www.readbyqxmd.com/read/28671622/landmark-based-drift-compensation-algorithm-for-inertial-pedestrian-navigation
#8
Estefania Munoz Diaz, Maria Caamano, Francisco Javier Fuentes Sánchez
The navigation of pedestrians based on inertial sensors, i.e., accelerometers and gyroscopes, has experienced a great growth over the last years. However, the noise of medium- and low-cost sensors causes a high error in the orientation estimation, particularly in the yaw angle. This error, called drift, is due to the bias of the z-axis gyroscope and other slow changing errors, such as temperature variations. We propose a seamless landmark-based drift compensation algorithm that only uses inertial measurements...
July 3, 2017: Sensors
https://www.readbyqxmd.com/read/28629191/a-new-filtering-and-smoothing-algorithm-for-railway-track-surveying-based-on-landmark-and-imu-odometer
#9
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/28621709/an-unobtrusive-fall-detection-and-alerting-system-based-on-kalman-filter-and-bayes-network-classifier
#10
Jian He, Shuang Bai, Xiaoyi Wang
Falls are one of the main health risks among the elderly. A fall detection system based on inertial sensors can automatically detect fall event and alert a caregiver for immediate assistance, so as to reduce injuries causing by falls. Nevertheless, most inertial sensor-based fall detection technologies have focused on the accuracy of detection while neglecting quantization noise caused by inertial sensor. In this paper, an activity model based on tri-axial acceleration and gyroscope is proposed, and the difference between activities of daily living (ADLs) and falls is analyzed...
June 16, 2017: Sensors
https://www.readbyqxmd.com/read/28615742/restarting-iterative-projection-methods-for-hermitian-nonlinear-eigenvalue-problems-with-minmax-property
#11
Marta M Betcke, Heinrich Voss
In this work we present a new restart technique for iterative projection methods for nonlinear eigenvalue problems admitting minmax characterization of their eigenvalues. Our technique makes use of the minmax induced local enumeration of the eigenvalues in the inner iteration. In contrast to global numbering which requires including all the previously computed eigenvectors in the search subspace, the proposed local numbering only requires a presence of one eigenvector in the search subspace. This effectively eliminates the search subspace growth and therewith the super-linear increase of the computational costs if a large number of eigenvalues or eigenvalues in the interior of the spectrum are to be computed...
2017: Numer Math (Heidelb)
https://www.readbyqxmd.com/read/28612890/technology-in-rehabilitation-comparing-personalised-and-global-classification-methodologies-in-evaluating-the-squat-exercise-with-wearable-imus
#12
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/28607801/quantitative-analysis-of-motor-status-in-parkinson-s-disease-using-wearable-devices-from-methodological-considerations-to-problems-in-clinical-applications
#13
REVIEW
Masahiko Suzuki, Hiroshi Mitoma, Mitsuru Yoneyama
Long-term and objective monitoring is necessary for full assessment of the condition of patients with Parkinson's disease (PD). Recent advances in biotechnology have seen the development of various types of wearable (body-worn) sensor systems. By using accelerometers and gyroscopes, these devices can quantify motor abnormalities, including decreased activity and gait disturbances, as well as nonmotor signs, such as sleep disturbances and autonomic dysfunctions in PD. This review discusses methodological problems inherent in wearable devices...
2017: Parkinson's Disease
https://www.readbyqxmd.com/read/28600261/haptic-orientation-guidance-using-two-parallel-double-gimbal-control-moment-gyroscopes
#14
Julie Walker, Heather Culbertson, Michael Raitor, Allison Okamura
This paper presents a system of two double-gimbal control moment gyroscopes (CMGs) for providing ungrounded kinesthetic haptic feedback. By spinning a second flywheel opposite the first, and rotating them through opposite trajectories, undesired gyroscopic effects can be eliminated, isolating a single torque axis. This produces a moment pulse proportional to the flywheel spin speed and rotation speed. Rotating the CMG gimbals quickly in one direction, then resetting them more slowly generates repeated torque pulses indicating a clear direction cue...
June 7, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28598610/octahedral-gyroscope-like-molecules-consisting-of-rhenium-rotators-within-cage-like-dibridgehead-diphosphine-stators-syntheses-substitution-reactions-structures-and-dynamic-properties
#15
Gisela D Hess, Tobias Fiedler, Frank Hampel, John A Gladysz
Reactions of Re(CO)5(X) (X = Cl, Br) or [Re2(CO)4(NO)2(μ-Cl)2(Cl)2] and the phosphines P((CH2)mCH═CH2)3 (m = 6, a; 7, b; 8, c) give mer,trans-Re(CO)3(X)(P((CH2)mCH═CH2)3)2 (53-95%) or cis,trans-Re(CO) (NO) (Cl)2(P((CH2)6CH═CH2)3)2 (57%), respectively. Additions of Grubbs' catalyst (5-10 mol %, 0.0010-0.0012 M) and subsequent hydrogenations (PtO2, ≤5 bar) yield the gyroscope-like complexes mer,trans-R e(CO)3(X)(P((CH2)n)3 P) (n = 2m + 2; X = Cl, 7a,c; Br, 8a,c; 18-61%) or cis,trans-R e(CO)(NO)(Cl)2(P((CH2)14)3 P) (14%), respectively, and/or the isomers mer,trans-R e(CO)3(X)( P(CH2)n-1 CH2)((CH2)n)( P(CH2)n-1 CH2) (X = Cl, 7'a-c; Br, 8'b; 6-27%)...
June 9, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28595865/profiling-of-translational-and-rotational-head-accelerations-in-youth-bmx-with-and-without-neck-brace
#16
Howard T Hurst, Lee Rylands, Stephen Atkins, Kevin Enright, Simon J Roberts
OBJECTIVES: To investigate the influence of BMX helmets and neck braces on translational and rotational accelerations in youth riders. DESIGN: Mixed model, repeated measure and correlation. METHODS: Twenty three competitive youth BMX riders classified by age group (6-9 years, 10-13 years and 14-18 years) completed 6 laps of an indoor BMX track at race pace, 3 laps without a neck brace (NB) and 3 without brace (WB). A triaxial accelerometer with gyroscope was placed behind the right ear to determine the mean number of accelerations, translational and rotational, of the head between conditions and by age group...
May 25, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28582975/crystalline-supramolecular-gyroscope-with-a-water-molecule-as-an-ultrasmall-polar-rotator-modulated-by-charge-assisted-hydrogen-bonds
#17
Wang Li, Chun-Ting He, Ying Zeng, Cheng-Min Ji, Zi-Yi Du, Wei-Xiong Zhang, Xiao-Ming Chen
A new strategy for the construction of crystalline molecular rotors is presented. The combination of a conformation-modifiable macrocyclic host and two cooperative guests affords one supramolecular gyroscope-like compound, (t-BuNH3)(18-crown-6)[ZnCl3(H2O)], in which the coordinated water molecule functions as an ultrasmall polar rotator, revealed by its significant dielectric relaxation and the molecular dynamics simulations. In addition, such a compound can reversibly undergo a polar-to-polar phase transition triggered by the changed conformation of the 18-crown-6 host, leading to a switchable on/off rotation of water molecule, well controlled by strength and direction of charge-assisted hydrogen bonds...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28578138/static-and-dynamic-validation-of-inertial-measurement-units
#18
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/28571428/deep-cooling-of-optically-trapped-atoms-implemented-by-magnetic-levitation-without-transverse-confinement
#19
Chen Li, Tianwei Zhou, Yueyang Zhai, Jinggang Xiang, Tian Luan, Qi Huang, Shifeng Yang, Wei Xiong, Xuzong Chen
We report a setup for the deep cooling of atoms in an optical trap. The deep cooling is implemented by eliminating the influence of gravity using specially constructed magnetic coils. Compared to the conventional method of generating a magnetic levitating force, the lower trap frequency achieved in our setup provides a lower limit of temperature and more freedoms to Bose gases with a simpler solution. A final temperature as low as ∼6nK is achieved in the optical trap, and the atomic density is decreased by nearly two orders of magnitude during the second stage of evaporative cooling...
May 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28546137/activity-recognition-for-persons-with-stroke-using-mobile-phone-technology-toward-improved-performance-in-a-home-setting
#20
Megan K O'Brien, Nicholas Shawen, Chaithanya K Mummidisetty, Saninder Kaur, Xiao Bo, Christian Poellabauer, Konrad Kording, Arun Jayaraman
BACKGROUND: Smartphones contain sensors that measure movement-related data, making them promising tools for monitoring physical activity after a stroke. Activity recognition (AR) systems are typically trained on movement data from healthy individuals collected in a laboratory setting. However, movement patterns change after a stroke (eg, gait impairment), and activities may be performed differently at home than in a lab. Thus, it is important to validate AR for gait-impaired stroke patients in a home setting for accurate clinical predictions...
May 25, 2017: Journal of Medical Internet Research
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