20 results match your criteria between-device reliability

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How far from the gold standard? Comparing the accuracy of a Local Position Measurement (LPM) system and a 15 Hz GPS to a laser for measuring acceleration and running speed during team sports.

PLoS One 2021 23;16(4):e0250549. Epub 2021 Apr 23.

Swiss Federal Institute of Sport Magglingen SFISM, Section for Elite Sport, Magglingen, Switzerland.

Purpose: This study compared the validity and inter- and intra-unit reliability of local (LPM) and global (GPS) position measurement systems for measuring acceleration during team sports.

Methods: Devices were attached to a remote-controlled car and validated against a laser. Mean percentage biases (MPBs) of maximal acceleration (amax) and maximal running speed (vmax) were used to measure validity. Read More

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Comparison between two multimodal imaging platforms: Nidek Mirante and Heidelberg Spectralis.

Graefes Arch Clin Exp Ophthalmol 2021 Jan 6. Epub 2021 Jan 6.

Sydney Retina, Level 13, Park House, 187 Macquarie Street, Sydney, NSW, 2000, Australia.

Purpose: To investigate the reliability and comparability of retinal measurements obtained with spectral-domain optical coherence tomography (OCT), optical coherence tomography angiography (OCTA), confocal scanning laser ophthalmoscopy (cSLO) colour images, and fundus autofluorescence (FAF) between two multimodal imaging platforms in eyes with macular pathology and normal, healthy volunteers.

Methods: This cross-sectional, multi-centre, instrument validation study recruited 94 consecutive subjects. All participants underwent a dilated examination and were scanned consecutively on the Heidelberg Spectralis (Heidelberg Engineering, Heidelberg, Germany) and Nidek Mirante (Nidek Co. Read More

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January 2021

Concurrent Validity and Reliability of Three Ultra-Portable Vertical Jump Assessment Technologies.

Sensors (Basel) 2020 Dec 17;20(24). Epub 2020 Dec 17.

Sports Performance Research Institute New Zealand, Auckland University of Technology, 1142 Auckland, New Zealand.

Vertical jump is a valuable training, testing, and readiness monitoring tool used across a multitude of sport settings. However, accurate field analysis has not always been readily available or affordable. For this study, two-dimensional motion capture (Mo-Cap), G-Flight micro-sensor, and PUSH accelerometer technologies were compared to a research-grade force-plate. Read More

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December 2020

Validation of Inertial Sensor to Measure Barbell Kinematics across a Spectrum of Loading Conditions.

Sports (Basel) 2020 Jun 29;8(7). Epub 2020 Jun 29.

Sport, Exercise, Recreation and Kinesiology, Clemmer College, East Tennessee State University, 1276 Gilbreath Dr, Johnson City, TN 37614, USA.

The aim of this study was to evaluate the level of agreement in measuring back squat kinematics between an inertial measurement unit (IMU) and a 3D motion capture system (3DMOCAP). Kinematic variables included concentric peak velocity (CPV), concentric mean velocity (CMV), eccentric peak velocity (EPV), eccentric mean velocity (EMV), mean propulsive velocity (MPV), and POP-100: a proprietary variable. Sixteen resistance-trained males performed an incrementally loaded one repetition maximum (1RM) squat protocol. Read More

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Technical and clinical performance of the thermo-test device "Q-Sense" to assess small fibre function: A head-to-head comparison with the "Thermal Sensory Analyzer" TSA in diabetic patients and healthy volunteers.

Eur J Pain 2019 11 9;23(10):1863-1878. Epub 2019 Sep 9.

Department of Neurophysiology, Medical Faculty Mannheim, Center of Biomedicine and Medical Technology, University of Heidelberg, Mannheim, Germany.

Background: Thermo-test devices are rarely used outside specialized pain centres because of high acquisition costs. Recently, a new, portable device ("Q-Sense") was introduced, which is less expensive but has reduced cooling capacity (20°C). We assessed the reliability/validity of the "Q-Sense" by comparing it with the Thermal Sensory Analyzer (TSA). Read More

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November 2019

Reproducibility and Repeatability of Five Different Technologies for Bar Velocity Measurement in Resistance Training.

Ann Biomed Eng 2019 Jul 12;47(7):1523-1538. Epub 2019 Apr 12.

Human Performance and Sports Science Laboratory, Faculty of Sport Sciences, University of Murcia, C/ Argentina s/n, Santiago de la Ribera, Murcia, Spain.

This study aimed to analyze the agreement between five bar velocity monitoring devices, currently used in resistance training, to determine the most reliable device based on reproducibility (between-device agreement for a given trial) and repeatability (between-trial variation for each device). Seventeen resistance-trained men performed duplicate trials against seven increasing loads (20-30-40-50-60-70-80 kg) while obtaining mean, mean propulsive and peak velocity outcomes in the bench press, full squat and prone bench pull exercises. Measurements were simultaneously registered by two linear velocity transducers (LVT), two linear position transducers (LPT), two optoelectronic camera-based systems (OEC), two smartphone video-based systems (VBS) and one accelerometer (ACC). Read More

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Can we use GPS for assessing sprinting performance in rugby sevens? A concurrent validity and between-device reliability study.

Biol Sport 2019 Mar 15;36(1):25-29. Epub 2018 Oct 15.

Research Department, French Rugby Union, Marcoussis, France.

The purpose of this study was to (1) provide data on maximal sprinting speed (MSS) and maximal acceleration (Amax) in elite rugby sevens players measured with GPS devices, (2) test the concurrent validity of the signal derived from a radar device and a commercially available 16 Hz GPS device, and (2) assess the between-device reliability of MSS and Amax of the same GPS. Fifteen elite rugby sevens players (90 ± 12 kg; 181 ± 8 cm; 26 ± 5 y) participated in the maximal sprinting test. A subset of five players participated in the concurrent validity and between-devices reliability study. Read More

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Int J Sports Phys Ther 2018 Aug;13(5):860-870

La Trobe Sport and Exercise Medicine Research Centre (LASEM), School of Allied Health, College of Science, Health and Engineering, La Trobe University, Melbourne, Victoria, Australia.

Background: Monitoring levels of physical activity, as an outcome or in guiding rehabilitation, is challenging for clinicians. Personal activity monitors are increasing in popularity and provide potential to enhance rehabilitation protocols. However, research to support the validity and reliability of these devices at jogging and running speeds is limited. Read More

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Validity and reliability of GPS and LPS for measuring distances covered and sprint mechanical properties in team sports.

PLoS One 2018 8;13(2):e0192708. Epub 2018 Feb 8.

University of Wuppertal, Department of Movement and Training Science, Wuppertal, Germany.

This study aimed to investigate the validity and reliability of global (GPS) and local (LPS) positioning systems for measuring distances covered and sprint mechanical properties in team sports. Here, we evaluated two recently released 18 Hz GPS and 20 Hz LPS technologies together with one established 10 Hz GPS technology. Six male athletes (age: 27±2 years; VO2max: 48. Read More

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Repeatability and Agreement of Orbscan II, Pentacam HR, and Galilei Tomography Systems in Corneas With Keratoconus.

Am J Ophthalmol 2017 Mar 18;175:122-128. Epub 2016 Dec 18.

Department of Ophthalmology, New Zealand National Eye Centre, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand.

Purpose: To assess the repeatability and agreement of keratometry and pachymetry measurements obtained using 3 tomographers in eyes with keratoconus.

Design: Reliability analysis.

Methods: setting: Institutional. Read More

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Validity and Reliability of Field Resonance Raman Spectroscopy for Assessing Carotenoid Status.

J Nutr Sci Vitaminol (Tokyo) 2016 ;62(5):317-321

Department of Human Nutrition, School of Health Care Sciences, Faculty of Health Sciences, University of Pretoria.

Carotenoids in fruit and vegetables are important for health, yet determining dietary intake is challenging. This study aimed to establish the validity and reliability of a portable field Resonance Raman Spectroscope (RRS) in reflecting human carotenoid status. A diagnostic accuracy study involving 81 healthy adults was conducted. Read More

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We-Measure: Toward a low-cost portable posturography for patients with multiple sclerosis using the commercial Wii balance board.

J Neurol Sci 2015 Dec 14;359(1-2):440-4. Epub 2015 Oct 14.

Department of Neurology and Psychiatry, Sapienza University, Rome, Italy. Electronic address:

This study was aimed at investigating whether postural sway measures derived from a standard force platform were similar to those generated by a custom-written software ("We-Measure") acquiring and processing data from a commercial Nintendo balance board (BB). For this purpose, 90 patients with multiple sclerosis (MS) and 50 healthy controls (HC) were tested in a single-day session with a reference standard force platform and a BB-based system. Despite its acceptable between-device agreement (tested by visual evaluation of Bland-Altman plot), the low-cost BB-based system tended to overestimate postural sway when compared to the reference standard force platform in both MS and HC groups (on average +30% and +54%, respectively). Read More

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December 2015

A comparison of video review and feedback device measurement of chest compressions quality during pediatric cardiopulmonary resuscitation.

Resuscitation 2015 Aug 4;93:35-9. Epub 2015 Jun 4.

Division of Critical Care Medicine, Children's Hospital of Philadelphia, PA, United States; Division of Emergency Medicine, Children's Hospital of Philadelphia, PA, United States. Electronic address:

Aim: To describe chest compression (CC) rate, depth, and leaning during pediatric cardiopulmonary resuscitation (CPR) as measured by two simultaneous methods, and to assess the accuracy and reliability of video review in measuring CC quality.

Methods: Resuscitations in a pediatric emergency department are videorecorded for quality improvement. Patients aged 8-18 years receiving CPR under videorecording were eligible for inclusion. Read More

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Validity and reliability of a novel slow cuff-deflation system for noninvasive blood pressure monitoring in patients with continuous-flow left ventricular assist device.

Circ Heart Fail 2013 Sep 27;6(5):1005-12. Epub 2013 Jun 27.

New York Presbyterian, Columbia University, New York, NY.

Background: Doppler ultrasound is the clinical gold standard for noninvasive blood pressure (BP) measurement among continuous-flow left ventricular assist device patients. The relationship of Doppler BP to systolic BP (SBP) and mean arterial pressure (MAP) is uncertain and Doppler measurements require a clinic visit. We studied the relationship between Doppler BP and both arterial-line (A-line) SBP and MAP. Read More

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September 2013

Malfunction of subpectorally implanted cardiac resynchronization therapy defibrillators due to weakened header bond.

J Cardiovasc Electrophysiol 2013 Mar 6;24(3):351-5. Epub 2012 Nov 6.

Department of Cardiac Electrophysiology, St. Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK.

Background: Implantable cardioverter defibrillator (ICD) implantation has increased significantly over the last 10 years. Concerns about the safety and reliability of ICD systems have been raised, with premature lead failure and battery malfunctions accounting for the majority of reported adverse events. We describe the unique mode of presentation, diagnosis, and management of cardiac resynchronization therapy defibrillators (CRT-D) malfunctions that were caused by weakened bonding between the generator and header. Read More

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Computer-aided design of customized foot orthoses: reproducibility and effect of method used to obtain foot shape.

Arch Phys Med Rehabil 2012 May;93(5):863-70

School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, UK.

Objective: To determine, for a number of techniques used to obtain foot shape based around plaster casting, foam box impressions, and 3-dimensional scanning, (1) the effect the technique has on the overall reproducibility of custom foot orthoses (FOs) in terms of inter- and intracaster reliability and (2) the reproducibility of FO design by using computer-aided design (CAD) software in terms of inter- and intra-CAD operator reliability for all these techniques.

Design: Cross-sectional study.

Setting: University laboratory. Read More

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Magnetic tunnel junction design margin exploration for self-reference sensing scheme.

Z Sun H Li X Wang

J Appl Phys 2012 Apr 13;111(7):7C726-7C7263. Epub 2012 Mar 13.

This work investigates the magnetic tunnel junction (MTJ) design requirements for the application of nondestructive self-reference sensing scheme, a novel sensing scheme featuring high tolerance of process variations, fast sensing speed, and no impact on device reliability. Unlike the conventional sensing scheme that requires a large TMR ratio and the uniform antiparallel and parallel resistances for MTJs, the nondestructive self-reference sensing scheme is more sensitive to the roll-off slope of MTJ's R-I or R-V curve. Our purpose is to provide a guidance to facilitate MTJ design used in the nondestructive self-reference scheme. Read More

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Results of the first randomized French study evaluating self-testing of the International Normalized Ratio.

J Heart Valve Dis 2011 Sep;20(5):518-25

Heart Surgery Department, Hôpital Gabriel Montpied CHU Clermont-Ferrand, France.

Background And Aim Of The Study: In this single-center French study, the conventional management of patients receiving vitamin K antagonists (VKAs) was compared with an International Normalized Ratio (INR) self-testing program. The aim was to determine the reliability of self-testing devices, and to estimate the variability of the self-measured INR within the therapeutic and target range.

Methods: A total of 206 patients who had undergone valve replacement with a mechanical prosthesis, with or without myocardial revascularization, between May 2004 and September 2007 was randomized into two groups. Read More

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September 2011

The reliability of MinimaxX accelerometers for measuring physical activity in Australian football.

Int J Sports Physiol Perform 2011 Sep;6(3):311-21

School of Sport and Exercise Science, Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Australia.

Purpose: To assess the reliability of triaxial accelerometers as a measure of physical activity in team sports.

Methods: Eight accelerometers (MinimaxX 2.0, Catapult, Australia) were attached to a hydraulic universal testing machine (Instron 8501) and oscillated over two protocols (0. Read More

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September 2011

Validity and reliability of the Nintendo Wii Balance Board for assessment of standing balance.

Gait Posture 2010 Mar 11;31(3):307-10. Epub 2009 Dec 11.

Centre for Health, Exercise and Sports Medicine, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Carlton, Victoria 3010, Australia.

Impaired standing balance has a detrimental effect on a person's functional ability and increases their risk of falling. There is currently no validated system which can precisely quantify center of pressure (COP), an important component of standing balance, while being inexpensive, portable and widely available. The Wii Balance Board (WBB) fits these criteria, and we examined its validity in comparison with the 'gold standard'-a laboratory-grade force platform (FP). Read More

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