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Validation of accelerometers

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https://www.readbyqxmd.com/read/27910103/reliability-and-concurrent-validity-of-a-new-iphone-%C3%A2-goniometric-application-for-measuring-active-wrist-range-of-motion-a-cross-sectional-study-in-asymptomatic-subjects
#1
Mohammad Reza Pourahmadi, Ismail Ebrahimi Takamjani, Javad Sarrafzadeh, Mehrdad Bahramian, Mohammad Ali Mohseni-Bandpei, Fatemeh Rajabzadeh, Morteza Taghipour
Measurement of wrist range of motion (ROM) is often considered to be an essential component of wrist physical examination. The measurement can be carried out through various instruments such as goniometers and inclinometers. Recent smartphones have been equipped with accelerometers and magnetometers, which, through specific software applications (apps) can be used for goniometric functions. This study, for the first time, aimed to evaluate the reliability and concurrent validity of a new smartphone goniometric app (Goniometer Pro©) for measuring active wrist ROM...
December 2, 2016: Journal of Anatomy
https://www.readbyqxmd.com/read/27905148/simultaneous-validation-of-five-activity-monitors-for-use-in-adult-populations
#2
C Powell, B P Carson, K P Dowd, A E Donnelly
Numerous cut-points exist to measure physical activity by accelerometry. The ability to compare accelerometer findings from different devices from different locations may be advantageous to researchers. This study aimed to develop and validate cut-points for 1.5, 3, and 6 METs in five activity monitors simultaneously. Fifty-six participants (mean age=39.9 [±11.5] years) performed six activities while wearing a CosMED K4b(2) and five activity monitors: activPAL3 Micro, activPAL, ActiGraph GT1M, ActiGraph wGT3X-BT, and GENEActiv...
December 1, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27896433/continuous-daily-assessment-of-multiple-sclerosis-disability-using-remote-step-count-monitoring
#3
V J Block, A Lizée, E Crabtree-Hartman, C J Bevan, J S Graves, R Bove, A J Green, B Nourbakhsh, M Tremblay, P-A Gourraud, M Y Ng, M J Pletcher, J E Olgin, G M Marcus, D D Allen, B A C Cree, J M Gelfand
Disability measures in multiple sclerosis (MS) rely heavily on ambulatory function, and current metrics fail to capture potentially important variability in walking behavior. We sought to determine whether remote step count monitoring using a consumer-friendly accelerometer (Fitbit Flex) can enhance MS disability assessment. 99 adults with relapsing or progressive MS able to walk ≥2-min were prospectively recruited. At 4 weeks, study retention was 97% and median Fitbit use was 97% of days. Substudy validation resulted in high interclass correlations between Fitbit, ActiGraph and manual step count tally during a 2-minute walk test, and between Fitbit and ActiGraph (ICC = 0...
November 28, 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27878789/regional-sociocultural-differences-as-important-correlate-of-physical-activity-and-sedentary-behaviour-in-swiss-preschool-children
#4
Claudia S Leeger-Aschmann, Einat A Schmutz, Thomas Radtke, Tanja H Kakebeeke, Annina E Zysset, Nadine Messerli-Bürgy, Kerstin Stülb, Amar Arhab, Andrea H Meyer, Simone Munsch, Oskar G Jenni, Jardena J Puder, Susi Kriemler
QUESTION: Regional differences in physical activity in school-aged children and adults even within one country with the same political and health care system have been observed and could not be explained by sociodemographic or individual variables. We analysed whether such differences were already present in preschool children. METHODS: Swiss children from 84 childcare centres in five cantons (Aargau, Bern, Fribourg, Vaud, Zurich) comprising about 50% of the population of the country participated...
2016: Swiss Medical Weekly
https://www.readbyqxmd.com/read/27874050/automatic-identification-of-systolic-time-intervals-in-seismocardiogram
#5
Ghufran Shafiq, Sivanagaraja Tatinati, Wei Tech Ang, Kalyana C Veluvolu
Continuous and non-invasive monitoring of hemodynamic parameters through unobtrusive wearable sensors can potentially aid in early detection of cardiac abnormalities, and provides a viable solution for long-term follow-up of patients with chronic cardiovascular diseases without disrupting the daily life activities. Electrocardiogram (ECG) and siesmocardiogram (SCG) signals can be readily acquired from light-weight electrodes and accelerometers respectively, which can be employed to derive systolic time intervals (STI)...
November 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27871100/biomechanical-response-of-military-booted-and-unbooted-foot-ankle-tibia-from-vertical-loading
#6
Frank A Pintar, Michael B Schlick, Narayan Yoganandan, Liming Voo, Andrew C Merkle, Michael Kleinberger
A new anthropomorphic test device (ATD) is being developed by the US Army to be responsive to vertical loading during a vehicle underbody blast event. To obtain design parameters for the new ATD, a series of non-injurious tests were conducted to derive biofidelity response corridors for the foot-ankle complex under vertical loading. Isolated post mortem human surrogate (PMHS) lower leg specimens were tested with and without military boot and in different initial foot-ankle positions. Instrumentation included a six-axis load cell at the proximal end, three-axis accelerometers at proximal and distal tibia, and calcaneus, and strain gages...
November 2016: Stapp Car Crash Journal
https://www.readbyqxmd.com/read/27851669/wrist-accelerometer-cut-points-for-classifying-sedentary-behavior-in-children
#7
Christiana M T van Loo, Anthony D Okely, Marijka J Batterham, Trina Hinkley, Ulf Ekelund, Søren Brage, John J Reilly, Stewart G Trost, Rachel A Jones, Xanne Janssen, Dylan P Cliff
INTRODUCTION: To examine the validity and accuracy of wrist accelerometers for classifying sedentary behavior (SB) in children. METHODS: Fifty-seven children (5-8y and 9-12y) completed a ~170min protocol including 15 semi-structured activities and transitions. Nine ActiGraph (GT3X+) and two GENEActiv wrist cut-points were evaluated. Direct observation was the criterion measure. The accuracy of wrist cut-points was compared to that achieved by the ActiGraph hip cut-point (≤25 counts/15s) and the thigh-mounted activPAL3...
November 16, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27827973/real-time-location-tracking-of-multiple-construction-laborers
#8
Jin-Sun Lim, Ki-Il Song, Hang-Lo Lee
A real-time location (RTL) system was developed to improve safety for multiple laborers in confined construction sites. The RTL system can monitor the location and movement of multiple laborers in real time. A portable RTL system with a low-battery mode was developed to accommodate various constraints in the construction site. A conventional RTL system that uses radio signal strength indicators (RSSIs) has high error, so an accelerometer with Bluetooth Low Energy (BLE) was added, and a calculation process is suggested...
November 6, 2016: Sensors
https://www.readbyqxmd.com/read/27822197/biomechanical-responses-of-the-brain-in-swine-subject-to-free-field-blasts
#9
Ke Feng, Liying Zhang, Xin Jin, Chaoyang Chen, Srinivasu Kallakuri, Tal Saif, John Cavanaugh, Albert King
Blast-induced traumatic brain injury (bTBI) is a signature wound of modern warfare. The current incomplete understanding of its injury mechanism impedes the development of strategies for effective protection of bTBI. Despite a considerable amount of experimental animal studies focused on the evaluation of brain neurotrauma caused by blast exposure, there is very limited knowledge on the biomechanical responses of the gyrenecephalic brain subjected to primary free-field blast waves imposed in vivo. This study aims to evaluate the external and internal mechanical responses of the brain against different levels of blast loading with Yucatan swine in free field...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27820724/activity-recognition-in-youth-using-single-accelerometer-placed-at-wrist-or-ankle
#10
Andrea Mannini, Mary Rosenberger, William L Haskell, Angelo M Sabatini, Stephen S Intille
PURPOSE: State-of-the-art methods for recognizing human activity using raw data from body worn accelerometers have primarily been validated with data collected from adults. This study applies a previously available method for activity classification using wrist or ankle accelerometer to work on datasets collected from both adults and youth. METHODS: An algorithm for detecting activity from wrist-worn accelerometers, originally developed using data from 33 adults, is tested on a dataset of 20 youth (age 13±1...
November 3, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27803137/validity-of-the-stage-of-exercise-scale-in-children-with-rheumatologic-conditions
#11
Samantha L Stephens, Mark S Tremblay, Guy Faulkner, Joseph Beyene, Tri H Nguyen, Suneye Koohsari, Elizaveta Limenis, Brian M Feldman
OBJECTIVE: To determine the face, content, and construct validity of the Stages of Exercise Scale (SOES) in children with rheumatologic conditions [juvenile idiopathic arthritis (JIA) and juvenile dermatomyositis (JDM)], and if the validity of the SOES differs by disease type by comparing it with a disease control with a chronic respiratory illness [cystic fibrosis (CF)]. METHODS: Sixty-seven children and adolescents (43 female) ages 11 to 18 years with a diagnosis of either JDM (n = 15), JIA (n = 39), or CF (n = 13) completed the SOES; scales of sensibility, process of change, decisional balance, and self-efficacy; the Child Health Assessment Questionnaire; and patient/physician ratings of disease severity...
December 2016: Journal of Rheumatology
https://www.readbyqxmd.com/read/27798733/a-novel-accelerometer-based-method-to-describe-day-to-day-exposure-to-potentially-osteogenic-vertical-impacts-in-older-adults-findings-from-a-multi-cohort-study
#12
K Hannam, K C Deere, A Hartley, E M Clark, J Coulson, A Ireland, C Moss, M H Edwards, E Dennison, T Gaysin, R Cooper, A Wong, J S McPhee, C Cooper, D Kuh, J H Tobias
: This observational study assessed vertical impacts experienced in older adults as part of their day-to-day physical activity using accelerometry and questionnaire data. Population-based older adults experienced very limited high-impact activity. The accelerometry method utilised appeared to be valid based on comparisons between different cohorts and with self-reported activity. INTRODUCTION: We aimed to validate a novel method for evaluating day-to-day higher impact weight-bearing physical activity (PA) in older adults, thought to be important in protecting against osteoporosis, by comparing results between four cohorts varying in age and activity levels, and with self-reported PA levels...
October 31, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27785561/validation-of-the-phillips-et-al-geneactiv-accelerometer-wrist-cut-points-in-children-aged-5-8%C3%A2-years-old
#13
Michael J Duncan, Susie Wilson, Jason Tallis, Emma Eyre
: This study examined the accuracy of the Phillips et al. GENEActiv accelerometer wrist worn cut-points in children aged 5-8. Fifteen children (six girls, nine boys) aged 5-8 years wore a GENEActiv monitor on their non-dominant wrist while undertaking 5 min bouts of lying supine, playing Lego, walking at slow, medium and fast pace and running. Receiver operating curve (ROC) analysis was employed to establish how well the Phillips et al. (2013) cut-points classified intensity of the activities compared to the actual intensity determined by indirect calorimetry...
October 26, 2016: European Journal of Pediatrics
https://www.readbyqxmd.com/read/27779133/validity-of-a-wearable-accelerometer-to-quantify-gait-in-spinocerebellar-ataxia-type-6
#14
Aodhán Hickey, Eleanor Gunn, Lisa Alcock, Silvia Del Din, Alan Godfrey, Lynn Rochester, Brook Galna
Biomarkers are required to track disease progression and measure the effectiveness of interventions for people with spinocerebellar ataxia type-6 (SCA6). Gait is a potential biomarker that is sensitive to SCA6 which can be measured using wearable technology, reducing the need for expensive specialist facilities. However, algorithms used to calculate gait using data from wearables have not been validated in SCA6. This study sought to examine the validity of a single wearable for deriving 14 spatio-temporal gait characteristics in SCA6 and control cohorts...
November 2016: Physiological Measurement
https://www.readbyqxmd.com/read/27777766/physical-activity-and-sedentary-behavior-in-belgium-bnfcs2014-design-methods-and-expected-outcomes
#15
Thérésa Lebacq, Cloë Ost, Sarah Bel, Loes Brocatus, Eveline Teppers, Koenraad Cuypers, Jean Tafforeau, Karin A A De Ridder
BACKGROUND: There is strong evidence to indicate that regular moderate intensity physical activity is associated with health benefits. Furthermore, sedentary behavior has been related with an increased risk for all-cause mortality. The accurate measurement of physical activity and sedentary behavior is therefore vital to evaluate their health impact and provide evidence for the development of public health recommendations. This paper describes the methodology used for assessing physical activity and sedentary behavior in the Belgian population in the context of the Belgian National Food Consumption Survey 2014 (BNFCS2014)...
2016: Archives of Public Health, Archives Belges de Santé Publique
https://www.readbyqxmd.com/read/27760219/calibration-and-cross-validation-of-the-actigraph-wgt3x-accelerometer-for-the-estimation-of-physical-activity-intensity-in-children-with-intellectual-disabilities
#16
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
https://www.readbyqxmd.com/read/27760071/isotemporal-substitution-analysis-for-sedentary-behavior-and-body-mass-index
#17
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
https://www.readbyqxmd.com/read/27747944/validity-of-a-single-question-to-assess-habitual-physical-activity-of-community-dwelling-older-people
#18
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
https://www.readbyqxmd.com/read/27735876/physical-activity-level-and-sedentary-behaviors-among-public-school-children-in-dakar-senegal-measured-by-paq-c-and-accelerometer-preliminary-results
#19
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
https://www.readbyqxmd.com/read/27724922/optimising-the-validity-and-completion-of-adherence-diaries-a-multiple-case-study-and-randomised-crossover-trial
#20
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
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