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Validation of accelerometers

Arlene M McGarty, Victoria Penpraze, Craig A Melville
BACKGROUND: Valid objective measurement is integral to increasing our understanding of physical activity and sedentary behaviours. However, no population-specific cut points have been calibrated for children with intellectual disabilities. Therefore, this study aimed to calibrate and cross-validate the first population-specific accelerometer intensity cut points for children with intellectual disabilities. METHODS: Fifty children with intellectual disabilities were randomly assigned to the calibration (n = 36; boys = 28, 9...
2016: PloS One
Wendy Yajun Huang, Stephen Heung-Sang Wong, Gang He, J O Salmon
PURPOSE: This study examined the prospective associations of reallocating time spent in different types of sedentary behavior, physical activity, and sleep with body mass index (BMI) in children using isotemporal substitution analysis. METHODS: Chinese children in grades 1-3 were recruited to a cohort study in 2009 and were followed up over a 2-yr period. Reports were gathered from the parents on children's sedentary behavior, sleep duration, and sociodemographic variables...
November 2016: Medicine and Science in Sports and Exercise
E Portegijs, S Sipilä, A Viljanen, M Rantakokko, T Rantanen
The aim is to determine concurrent validity of a single self-report habitual physical activity (PA) question against accelerometer-based PA and mobility variables, and corresponding changes in self-reported PA and mobility. Cross-sectional and longitudinal data of the "Life-space mobility in old age" (LISPE) cohort and its substudy on PA were utilized. At baseline, 848 community-dwelling, 75- to 90-year-old people living independently in central Finland participated in home-based interviews. One and 2 years later, 816 and 761 of them were reassessed by phone, respectively...
October 17, 2016: Scandinavian Journal of Medicine & Science in Sports
Adama Diouf, Mbeugué Thiam, Nicole Idohou-Dossou, Ousmane Diongue, Ndé Mégné, Khady Diallo, Pape Malick Sembène, Salimata Wade
Background: Physical inactivity and sedentary lifestyles are major risk factors of childhood obesity. This study aimed to measure physical activity (PA) levels by accelerometer and Physical Activity Questionnaire for Older Children (PAQ-C) among Senegalese school children and the relation with Body Mass Index (BMI) and body composition. Methodology: 156 pupils 8-11 years old were randomly selected in four elementary public schools of Dakar. BMI z-score was used to categorize children according to their weight status...
October 10, 2016: International Journal of Environmental Research and Public Health
Rachael Frost, Doreen McClurg, Marian Brady, Brian Williams
BACKGROUND: Diaries are the most commonly used adherence measurement method in home-based rehabilitation trials, yet their completion and validity varies widely between trials. We aimed to: (1) generate theory to explain this variation, (2) create an optimised diary and (3) evaluate the optimised diary's validity. METHODS: Stage 1. DEVELOPMENT: using a multiple case study approach, we collected trialist interviews (n = 7), trial publications (n = 16) and diaries (n = 7) from seven purposively sampled UK rehabilitation trials...
October 10, 2016: Trials
Kishan Bakrania, Thomas Yates, Alex V Rowlands, Dale W Esliger, Sarah Bunnewell, James Sanders, Melanie Davies, Kamlesh Khunti, Charlotte L Edwardson
OBJECTIVES: (1) To develop and internally-validate Euclidean Norm Minus One (ENMO) and Mean Amplitude Deviation (MAD) thresholds for separating sedentary behaviours from common light-intensity physical activities using raw acceleration data collected from both hip- and wrist-worn tri-axial accelerometers; and (2) to compare and evaluate the performances between the ENMO and MAD metrics. METHODS: Thirty-three adults [mean age (standard deviation (SD)) = 27.4 (5.9) years; mean BMI (SD) = 23...
2016: PloS One
Stephanie E Chappel, Brad Aisbett, Grace E Vincent, Nicola D Ridgers
Little is currently known about the physical activity patterns of workers in physically demanding populations. The aims of this study were to (a) quantify firefighters' physical activity and sedentary time within (2-h periods) and across planned burn shifts; and (b) examine whether firefighters' activity levels during one shift or 2-h period was associated with their activity levels in the following shift or 2-h period. Thirty-four salaried firefighters (26 men, 8 women) wore an Actical accelerometer for 28 consecutive days...
September 30, 2016: International Journal of Environmental Research and Public Health
Rory P Wilson, Mark D Holton, James S Walker, Emily L C Shepard, D Mike Scantlebury, Vianney L Wilson, Gwendoline I Wilson, Brenda Tysse, Mike Gravenor, Javier Ciancio, Melitta A McNarry, Kelly A Mackintosh, Lama Qasem, Frank Rosell, Patricia M Graf, Flavio Quintana, Agustina Gomez-Laich, Juan-Emilio Sala, Christina C Mulvenna, Nicola J Marks, Mark W Jones
BACKGROUND: We are increasingly using recording devices with multiple sensors operating at high frequencies to produce large volumes of data which are problematic to interpret. A particularly challenging example comes from studies on animals and humans where researchers use animal-attached accelerometers on moving subjects to attempt to quantify behaviour, energy expenditure and condition. RESULTS: The approach taken effectively concatinated three complex lines of acceleration into one visualization that highlighted patterns that were otherwise not obvious...
2016: Movement Ecology
M Wanner, A Richard, B Martin, D Faeh, S Rohrmann
OBJECTIVES: To investigate associations between self-reported and objectively measured physical activity, sedentary behavior and overweight/obesity based on percent body fat measured with Dual Energy X-Ray Absorptiometry (DXA), waist circumference (WC), waist-to-height ratio (WHtR) and body mass index (BMI), focusing on different intensities and domains of physical activity. METHODS: Data from NHANES 2003-2006 were analyzed using linear and ordered logistic regression analyses...
September 28, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
Stéphane Mandigout, Nicolas Vuillerme, Benoit Borel, Anaick Perrochon, Justine Lacroix, Stéphane Mandigout
OBJECTIVE: The aim of this work is to compare the evaluation/measurement of the daily energy expenditure related to physical activity with the use of different actimeters currently available. MATERIAL/PATIENTS AND METHODS: Twenty-four young healthy adults voluntarily participate in this study. Energy expenditure related to the realization of daily physical activities was assessed during 24hours with three accelerometers (Actigraph GT3X-BT, Actical and Stayhealthy RT6) and with a pedometer (ONStep Geonaute)...
September 2016: Annals of Physical and Rehabilitation Medicine
Catrine Tudor-Locke, John M Schuna, Ho Han, Elroy J Aguiar, Michael A Green, Michael A Busa, Sandra Larrivee, William D Johnson
PURPOSE: To catalog the relationships between step-based accelerometer metrics indicative of physical activity volume (steps/day, adjusted to a pedometer scale), intensity (mean steps/min from the highest, not necessarily consecutive, minutes in a day; peak 30-min cadence) and sedentary behavior (percent time at zero cadence relative to wear time; %TZC) and cardiometabolic risk factors. METHODS: We analyzed data from 3388 20+ year-old participants in the 2005-2006 National Health and Nutrition Examination Survey with ≥1 valid day of accelerometer data and at least some data on weight, BMI, waist circumference, systolic and diastolic blood pressure, glucose, insulin, HDL-cholesterol, triglycerides, and/or glycohemoglobin...
September 23, 2016: Medicine and Science in Sports and Exercise
Qian Zhang, Lei Wang, Zengjun Liu, Yiming Zhang
The calibration of an inertial measurement unit (IMU) is a key technique to improve the preciseness of the inertial navigation system (INS) for missile, especially for the calibration of accelerometer scale factor. Traditional calibration method is generally based on the high accuracy turntable, however, it leads to expensive costs and the calibration results are not suitable to the actual operating environment. In the wake of developments in multi-axis rotational INS (RINS) with optical inertial sensors, self-calibration is utilized as an effective way to calibrate IMU on missile and the calibration results are more accurate in practical application...
September 19, 2016: Optics Express
Grace Javier, Munesha Lona, Dawn Hamilton
No abstract text is available yet for this article.
2016: Pediatric Physical Therapy
Piyapa Keawutan, Kristie L Bell, Stina Oftedal, Peter S W Davies, Roslyn N Boyd
PURPOSE: To derive and validate triaxial accelerometer cut-points in children with cerebral palsy (CP) and compare these with previously established cut-points in children with typical development. METHODS: Eighty-four children with CP aged 4 to 5 years wore the ActiGraph during a play-based gross motor function measure assessment that was video-taped for direct observation. Receiver operating characteristic and Bland-Altman plots were used for analyses. RESULTS: The ActiGraph had good classification accuracy in Gross Motor Function Classification System (GMFCS) levels III and V and fair classification accuracy in GMFCS levels I, II, and IV...
2016: Pediatric Physical Therapy
Simon N van Laarhoven, Matthijs Lipperts, Stijn A A N Bolink, Rachel Senden, Ide C Heyligers, Bernd Grimm
BACKGROUND: A growing need in clinical practice of rehabilitation and orthopaedic medicine is for objective outcome tools to estimate physical activity. Current techniques show limited validity or are too demanding for routine clinical use. Accelerometer-based activity monitors (AMs) have shown promise for measuring physical activity in healthy people but lack validity in impaired patients. OBJECTIVES: This study aimed to validate an accelerometer-based AM in impaired, slow-walking, crutch-supported patients after total joint arthroplasty (TJA)...
September 19, 2016: Annals of Physical and Rehabilitation Medicine
Tiphaine Jeanniard-du-Dot, Andrew W Trites, John P Y Arnould, John R Speakman, Christophe Guinet
Flipper strokes have been proposed as proxies to estimate the energy expended by marine vertebrates while foraging at sea, but this has never been validated on free-ranging otariids (fur seals and sea lions). Our goal was to investigate how well flipper strokes correlate with energy expenditure in 33 foraging northern and Antarctic fur seals equipped with accelerometers, GPS, and time-depth recorders. We concomitantly measured field metabolic rates with the doubly-labelled water method and derived activity-specific energy expenditures using fine-scale time-activity budgets for each seal...
2016: Scientific Reports
Gregory M Dominick, Kyle N Winfree, Ryan T Pohlig, Mia A Papas
BACKGROUND: Wearable activity monitors such as Fitbit enable users to track various attributes of their physical activity (PA) over time and have the potential to be used in research to promote and measure PA behavior. However, the measurement accuracy of Fitbit in absolute free-living conditions is largely unknown. OBJECTIVE: To examine the measurement congruence between Fitbit Flex and ActiGraph GT3X for quantifying steps, metabolic equivalent tasks (METs), and proportion of time in sedentary activity and light-, moderate-, and vigorous-intensity PA in healthy adults in free-living conditions...
2016: JMIR MHealth and UHealth
Sue D Barber-Westin, Frank R Noyes
CONTEXT: Total knee arthroplasty (TKA) is routinely performed in younger patients who desire to be active in fitness and recreational sports. The activities patients can participate in without symptoms and the level of aerobic fitness routinely maintained are important to investigate. OBJECTIVE: To determine physical activity (PA) and recreational sports resumed after primary TKA, symptoms or limitations with these activities, and the effect of postoperative rehabilitation on achieving fitness and sports goals...
September 19, 2016: Sports Health
Lori Kowaleski-Jones, Jessie X Fan, Ming Wen, Heidi Hanson
PURPOSE: The goal of this research is to examine the extent to which facets of neighborhood sociodemographic contexts influence individual-level physical activity (PA) among youth. DESIGN: Using National Health and Nutrition Examination Survey (NHANES), geographic information systems (GIS), and census data sources, we explicitly test whether built environment factors have differential associations depending on the age and gender of the youth living in urban census tracts...
September 16, 2016: American Journal of Health Promotion: AJHP
Mohammad Reza Pourahmadi, Morteza Taghipour, Elham Jannati, Mohammad Ali Mohseni-Bandpei, Ismail Ebrahimi Takamjani, Fatemeh Rajabzadeh
BACKGROUND: Measurement of lumbar spine range of motion (ROM) is often considered to be an essential component of lumbar spine physiotherapy and orthopedic assessment. The measurement can be carried out through various instruments such as inclinometers, goniometers, and etc. Recent smartphones have been equipped with accelerometers and magnetometers, which, through specific software applications (apps) can be used for inclinometric functions. PURPOSE: The main purpose was to investigate the reliability and validity of an iPhone(®) app (TiltMeter(©) -advanced level and inclinometer) for measuring standing lumbar spine flexion-extension ROM in asymptomatic subjects...
2016: PeerJ
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