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A Acker, J-F Fischer, K Aminian, E Lécureux, B M Jolles
BACKGROUND: Rates of dislocation following primary total hip arthroplasty (THA) vary from 0.5 to 10%. Dual-mobility cups in THA demonstrate increased stability. Clinical outcomes following THA with dual-mobility cups have been reported, but gait has not been assessed. Therefore we performed a retrospective case control study to answer: (1) is gait better in patients following THA with a dual-mobility cup than in frail, elderly patients of the same age? (2) Are clinical outcomes better in patients following THA with a dual-mobility cup than in frail, elderly patients? (3) What is the dislocation rate following THA with a dual-mobility cup? HYPOTHESIS: We hypothesized that patients who underwent THA with a dual-mobility cup have a better gait compared to frail, elderly patients of the same age...
November 24, 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
Stephen Ragole, Jacob M Taylor
Atom interferometers provide exquisite measurements of the properties of noninertial frames. While atomic interactions are typically detrimental to good sensing, efforts to harness entanglement to improve sensitivity remain tantalizing. Here we explore the role of interactions in an analogy between atomic gyroscopes and SQUIDs, motivated by recent experiments realizing ring-shaped traps for ultracold atoms. We explore the one-dimensional limit of these ring systems with a moving weak barrier, such as that provided by a blue-detuned laser beam...
November 11, 2016: Physical Review Letters
Marek Strzała, Arkadiusz Stanula, Andrzej Ostrowski, Marcin Kaca, Piotr Kreżałek, Jacek Głodzik
BACKGROUND: This work is aimed at examining how coordination and kinematic indices interplay with swimming performance measured by average speed in 50m all-out test. METHODS: The group of 34 male competitive swimmers (19.1± 1.91 years old) participated in the study. The underwater movements of swimmers' bodies were recorded providing side- shots. Accelerations and angular velocity of pitch rotation of swimmer's sacrum were measured with inertial sensor device (three-axial accelerometer and gyroscope)...
November 24, 2016: Journal of Sports Medicine and Physical Fitness
L S Cuijpers, P J M Passos, A Murgia, A Hoogerheide, K A P M Lemmink, H J de Poel
In crew rowing, crew members need to mutually synchronize their movements to achieve optimal crew performance. Intuitively, poor crew coordination is often deemed to involve additional boat movements such as surge velocity fluctuations, heave, pitch, and roll, which would imply lower efficiency (eg, due to increased hydrodynamic drag). The aim of this study was to investigate this alleged relation between crew coordination and boat movements at different stroke rates. Fifteen crews of two rowers rowed in a double scull (ie, a two-person boat) at 18, 22, 26, 30, and 34 strokes per minute...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
Hanzhao Li, Jianjie Zhang, Linglan Wang, Huilian Ma, Zhonghe Jin
A fiber ring resonator is the key element in a resonant fiber optic gyroscope (RFOG). Both reflection and loss characteristics can severely decrease the accuracy of the RFOG. This paper first implements optical frequency domain reflectometry (OFDR) to measure the reflection and loss coefficients of the hybrid air-core photonic-bandgap fiber (PBF) ring resonator. Compared with the traditional measurement method of the resonant curve, OFDR can clearly distinguish the two junctions between the air-core PBF and the solid-core fiber...
November 10, 2016: Applied Optics
Chao Deng, Yao Mao, Ge Ren
In this paper, an approach to improve the disturbance suppression performance of a fast steering mirror (FSM) tracking control system based on a charge-coupled device (CCD) and micro-electro-mechanical system (MEMS) inertial sensors is proposed. The disturbance observation and compensation (DOC) control method is recommended to enhance the classical multi-loop feedback control (MFC) for line-of-sight (LOS) stabilization in the FSM system. MEMS accelerometers and gyroscopes have been used in the FSM system tentatively to implement MFC instead of fiber-optic gyroscopes (FOG) because of its smaller, lighter, cheaper features and gradually improved performance...
November 15, 2016: Sensors
Pietro Picerno
Joint kinematics is typically limited to the laboratory environment, and the restricted volume of capture may vitiate the execution of the motor tasks under analysis. Conversely, clinicians often require the analysis of motor acts in non-standard environments and for long periods of time, such as in ambulatory settings or during daily life activities. The miniaturisation of motion sensors and electronic components, generally associated with wireless communications technology, has opened up a new perspective: movement analysis can be carried out outside the laboratory and at a relatively lower cost...
November 5, 2016: Gait & Posture
Lionel R Milgrom
BACKGROUND: Patient-practitioner-remedy (PPR) entanglement postulates non-local triadic interaction between patient (Px), practitioner (Pr) and potentised medicine (Rx), resulting in the patient's journey to cure; the in-depth homeopathic interview is considered a major contributing factor in this process. Also, by modelling entelechy, a quantised gyroscopic analogue of the Vital Force (Vf) has been developed. OBJECTIVE: To discover whether entanglement notions explain the mode of action of homeopathy during the treatment of epidemic diseases, when the individualising in-depth homeopathic interview is neither possible nor necessary...
2016: Forschende Komplementärmedizin, Research in Complementary Medicine
Oliver P Dewhirst, Kyle Roskilly, Tatjana Y Hubel, Neil R Jordan, Krystyna A Golabek, J Weldon McNutt, Alan M Wilson
Changes in stride frequency and length with speed are key parameters in animal locomotion research. They are commonly measured in a laboratory on a treadmill or by filming trained captive animals. Here we show that a clustering approach can be used to extract these variables from data collected by a tracking collar containing a GPS module and tri-axis accelerometers and gyroscopes. The method enables stride parameters to be measured during free ranging locomotion in natural habitats. As it does not require labelled data it is particularly suitable for use with difficult to observe animals...
November 3, 2016: Journal of Experimental Biology
Jochen Klenk, Lars Schwickert, Luca Palmerini, Sabato Mellone, Alan Bourke, Espen A F Ihlen, Ngaire Kerse, Klaus Hauer, Mirjam Pijnappels, Matthis Synofzik, Karin Srulijes, Walter Maetzler, Jorunn L Helbostad, Wiebren Zijlstra, Kamiar Aminian, Christopher Todd, Lorenzo Chiari, Clemens Becker
BACKGROUND: Real-world fall events objectively measured by body-worn sensors can improve the understanding of fall events in older people. However, these events are rare and hence challenging to capture. Therefore, the FARSEEING (FAll Repository for the design of Smart and sElf-adaptive Environments prolonging Independent livinG) consortium and associated partners started to build up a meta-database of real-world falls. RESULTS: Between January 2012 and December 2015 more than 300 real-world fall events have been recorded...
2016: European Review of Aging and Physical Activity
Xiaopu Wang, Yan Xiong, Wenchao Huang
With the development of localization technologies, researchers solve the indoor localization problems using diverse methods and equipment. Most localization techniques require either specialized devices or fingerprints, which are inconvenient for daily use. Therefore, we propose and implement an accurate, efficient and lightweight system for indoor direction finding using common smartphones and loudspeakers. Our method is derived from a key insight: By moving a smartphone in regular patterns, we can effectively emulate the sensitivity and functionality of a Uniform Antenna Array to estimate the angle of arrival of the target signal...
October 29, 2016: Sensors
Fangmin Li, Guo Liu, Jian Liu, Xiaochuang Chen, Xiaolin Ma
Most location-based services are based on a global positioning system (GPS), which only works well in outdoor environments. Compared to outdoor environments, indoor localization has created more buzz in recent years as people spent most of their time indoors working at offices and shopping at malls, etc. Existing solutions mainly rely on inertial sensors (i.e., accelerometer and gyroscope) embedded in mobile devices, which are usually not accurate enough to be useful due to the mobile devices' random movements while people are walking...
October 28, 2016: Sensors
Seulki Han, Daehee Lee, Sangyong Lee
[Purpose] Evaluation of the reliability of smartphones as measuring equipment for dynamic balance ability was the goal of this study. [Subjects and Methods] Subjects were 30 healthy young students in their 20s. The first and second rounds of measurements were taken at a one-day interval to confirm test-retest reliability. The subjects stood on the footboard of the Biodex Balance System. Balance was measured using a smart phone. [Results] Acceleration rates corresponding to subjects with open eyes were 2.7 ± 2...
September 2016: Journal of Physical Therapy Science
Rubens Spin-Neto, Louise Hauge Matzen, Lars Wisti Schropp, Erik Gotfredsen, Ann Wenzel
OBJECTIVE: Compare video observation (VO) with a novel three-dimensional registration method, based on an accelerometer-gyroscope (AG) system, to detect patient movement during CBCT examination. The movements were further analyzed according to complexity and patient's age. METHODS: 181 patients (118 female/63 male; age average 30 years, range: 9-84), in whom 206 CBCT examinations were performed, were video-recorded during examination. An AG was at the same time attached to the patient's head to track head position in three dimensions...
October 27, 2016: Dento Maxillo Facial Radiology
Darragh F Whelan, Martin A O'Reilly, Tomás E Ward, Eamonn Delahunt, Brian Caulfield
BACKGROUND: The single leg squat (SLS) is a common lower limb rehabilitation exercise. It is also frequently used as an evaluative exercise to screen for an increased risk of lower limb injury. To date athlete / patient SLS 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 SLS technique...
October 26, 2016: Methods of Information in Medicine
R Barrois, Th Gregory, L Oudre, Th Moreau, Ch Truong, A Aram Pulini, A Vienne, Ch Labourdette, N Vayatis, S Buffat, A Yelnik, C de Waele, S Laporte, P P Vidal, D Ricard
For diagnosis and follow up, it is important to be able to quantify limp in an objective, and precise way adapted to daily clinical consultation. The purpose of this exploratory study was to determine if an inertial sensor-based method could provide simple features that correlate with the severity of lower limb osteoarthritis evaluated by the WOMAC index without the use of step detection in the signal processing. Forty-eight patients with lower limb osteoarthritis formed two severity groups separated by the median of the WOMAC index (G1, G2)...
2016: PloS One
Minglin Wu, Sheng Zhang, Yuhan Dong
In this article, a novel driving behavior recognition system based on a specific physical model and motion sensory data is developed to promote traffic safety. Based on the theory of rigid body kinematics, we build a specific physical model to reveal the data change rule during the vehicle moving process. In this work, we adopt a nine-axis motion sensor including a three-axis accelerometer, a three-axis gyroscope and a three-axis magnetometer, and apply a Kalman filter for noise elimination and an adaptive time window for data extraction...
October 20, 2016: Sensors
Boqian Sun, Shunyue Wang, Haixia Li, Xiaoxia He
A micromachined gyroscope in which a high-speed spinning rotor is suspended electrostatically in a vacuum cavity usually functions as a dual-axis angular rate sensor. An inherent coupling error between the two sensing axes exists owing to the angular motion of the spinning rotor being controlled by a torque-rebalance loop. In this paper, a decoupling compensation method is proposed and investigated experimentally based on an electrostatically suspended micromachined gyroscope. In order to eliminate the negative spring effect inherent in the gyroscope dynamics, a stiffness compensation scheme was utilized in design of the decoupled rebalance loop to ensure loop stability and increase suspension stiffness...
October 20, 2016: Sensors
Cherie Walker, Peter Sinclair, Kenneth Graham, Stephen Cobley
Inertial Measurement Units (IMUs) may offer an ecologically valid, reliable, and practical method for biomechanical performance analysis. With such potential in mind, Part 1 of this study examined the accuracy of IMUs gyroscopes with an optical system (Cortex 3.3). A calibration formula standardised the IMUs angular velocity output with the optical system. The percentage differences between the two measures = 0.5% (p < 0.05), suggest IMU's efficacy for application. In Part 2, the aim was to examine and understand how dive flight angular velocity time series plots change and increase according to dive degree of difficulty...
October 20, 2016: Sports Biomechanics
Li Xing, Yijun Hang, Zhi Xiong, Jianye Liu, Zhong Wan
This paper describes a disturbance acceleration adaptive estimate and correction approach for an attitude reference system (ARS) so as to improve the attitude estimate precision under vehicle movement conditions. The proposed approach depends on a Kalman filter, where the attitude error, the gyroscope zero offset error and the disturbance acceleration error are estimated. By switching the filter decay coefficient of the disturbance acceleration model in different acceleration modes, the disturbance acceleration is adaptively estimated and corrected, and then the attitude estimate precision is improved...
October 16, 2016: Sensors
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