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Validation of accelerometers

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https://www.readbyqxmd.com/read/28210966/predictors-of-physical-activity-after-gastric-bypass-a-prospective-study
#1
Irmelin Bergh, Ingela Lundin Kvalem, Tom Mala, Bjørge Herman Hansen, Falko F Sniehotta
BACKGROUND: Most patients do not meet the recommended level of physical activity after bariatric surgery, and psychological factors underlying postoperative physical activity remain poorly understood. This study aimed at identifying self-regulatory predictors of physical activity after bariatric surgery. METHODS: Questionnaire data including self-regulation variables and the short-version of the International Physical Activity Questionnaire were obtained in a prospective cohort of 230 patients 1 year after Roux-en-Y gastric bypass...
February 16, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28210059/the-validity-of-an-accelerometer-based-method-for-estimating-fluidity-in-the-sit-to-walk-task-in-a-community-setting
#2
Tomoyuki Asakura, Yoshiyuki Miyazawa, Shigeru Usuda
[Purpose] Fluidity in the sit-to-walk task has been quantitatively measured with three-dimensional motion analysis system. The purpose of this study was to determine the validity of an accelerometer-based method for estimating fluidity in community-dwelling elderly individuals. [Subjects and Methods] Seventeen community-dwelling elderly females performed a sit-to-walk task. The motion was recorded by an accelerometer, a three-dimensional motion analysis system and a foot pressure sensor simultaneously. The timings of events determined from the acceleration waveform were compared to the timings determined from the three-dimensional motion analysis data (task onset, maximum trunk inclination) or foot pressure sensor data (first heel strike)...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28206828/validity-of-the-timed-25-foot-walk-as-an-ambulatory-performance-outcome-measure-for-multiple-sclerosis
#3
Robert W Motl, Jeffrey A Cohen, Ralph Benedict, Glenn Phillips, Nicholas LaRocca, Lynn D Hudson, Richard Rudick
The Multiple Sclerosis Outcome Assessments Consortium (MSOAC) includes representatives from advocacy organizations, Food and Drug Administration (FDA), European Medicines Agency (EMA), National Institute of Neurological Disorders and Stroke (NINDS), academic institutions, and industry partners along with persons living with multiple sclerosis (MS). One of the MSOAC goals is acceptance and qualification by regulators of performance outcomes that are highly reliable and valid, practical, cost-effective, and meaningful in MS...
February 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28191545/the-future-of-mobile-health-applications-and-devices-in-cardiovascular-health
#4
Heval Mohamed Kelli, Bradley Witbrodt, Amit Shah
Mobile health (mHealth) is the utilisation of mobile technologies in healthcare and has particular relevance in improving lifestyle behaviours which may ultimately reduce cardiovascular disease risk. Various intervention studies for example integrate self-monitoring of diet and physical activity with text messaging systems to improve intermediate outcomes. Currently the future progress of mHealth technologies in formal diagnostic and therapeutic roles is pending and includes the need to validate and standardise accelerometer and heart rate data from various devices...
January 2017: Euro Med J Innov
https://www.readbyqxmd.com/read/28187890/evaluation-of-a-smartphone-based-assessment-system-in-subjects-with-chronic-ankle-instability
#5
Ya-Lan Chiu, Yi-Ju Tsai, Chueh-Ho Lin, You-Ruei Hou, Wen-Hsu Sung
BACKGROUND: Ankle sprain is the most common sports-related injury, and approximately 80% of patients studied suffered recurrent sprains. These repeated ankle injuries could cause chronic ankle instability, a decrease in sports performance, and a decrease in postural control ability. At the present time, smartphones have become very popular and powerful devices, and smartphone applications (apps) that have been shown to have good validity have been designed to measure human body motion...
February 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28181981/measuring-children-s-physical-activity-compliance-using-skin-taped-accelerometers
#6
Mikkel Bo Schneller, Peter Bentsen, Glen Nielsen, Jan Christian Brønd, Mathias Ried-Larsen, Erik Mygind, Jasper Schipperijn
INTRODUCTION: Accelerometer-based physical activity monitoring has become the method of choice in many large-scale physical activity (PA) studies. However, there is an ongoing debate regarding the placement of the device, the determination of device wear time, and how to solve a lack of participant compliance. The aim of this study was to assess the compliance of Axivity AX3 accelerometers taped directly to the skin of 9-13-year-old children. METHODS: Children in 46 school classes (53...
February 8, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28180055/associations-among-physical-activity-screen-time-and-sleep-in-low-socioeconomic-status-urban-girls
#7
Cory J Greever, Matthew Ahmadi, John Sirard, Sofiya Alhassan
Insufficient sleep is associated with higher risk of poor health outcomes in low socioeconomic status (SES) urban elementary age girls. Decreased physical activity (PA) and increased screen time may be associated with poor sleep. This study examined if PA and screen time are associated with sleep in girls from a low SES urban community. Baseline data from 7 to 12 year-old girls (n = 55) from two interventions conducted in Springfield, MA between 2012 and 2015 were used. PA was measured via accelerometry for seven days...
March 2017: Preventive Medicine Reports
https://www.readbyqxmd.com/read/28179062/smartphone-assessment-of-knee-flexion-compared-to-radiographic-standards
#8
Matthew J Dietz, Daniel Sprando, Andrew E Hanselman, Michael D Regier, Benjamin M Frye
BACKGROUND: Measuring knee range of motion (ROM) is an important assessment for the outcomes of total knee arthroplasty. Recent technological advances have led to the development and use of accelerometer-based smartphone applications to measure knee ROM. The purpose of this study was to develop, standardize, and validate methods of utilizing smartphone accelerometer technology compared to radiographic standards, visual estimation, and goniometric evaluation. METHODS: Participants used visual estimation, a long-arm goniometer, and a smartphone accelerometer to determine range of motion of a cadaveric lower extremity; these results were compared to radiographs taken at the same angles...
February 5, 2017: Knee
https://www.readbyqxmd.com/read/28178426/physical-activity-in-pediatric-pulmonary-arterial-hypertension-measured-by-accelerometry-a-candidate-clinical-endpoint
#9
Willemijn M H Zijlstra, Mark-Jan Ploegstra, Theresia Vissia-Kazemier, Marcus T R Roofthooft, Gideon du Marchie Sarvaas, Beatrijs Bartelds, Annette Rackowitz, Freek van den Heuvel, Hans L Hillege, Guy Plasqui, Rolf M F Berger
Rationale- The development of evidence-based treatment guidelines for pediatric pulmonary arterial hypertension (PAH) is hampered by lack of pediatric clinical trials. Trial-design is hampered by lack of a feasible clinical endpoint in this population. Objectives- To evaluate the use of accelerometry for measuring physical activity (PA) in pediatric PAH and to investigate its correlation with clinical disease severity markers. Methods- We included children from the Dutch National Network for Pediatric Pulmonary Hypertension...
February 8, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28166824/in-lab-versus-at-home-activity-recognition-in-ambulatory-subjects-with-incomplete-spinal-cord-injury
#10
Mark V Albert, Yohannes Azeze, Michael Courtois, Arun Jayaraman
BACKGROUND: Although commercially available activity trackers can aid in tracking therapy and recovery of patients, most devices perform poorly for patients with irregular movement patterns. Standard machine learning techniques can be applied on recorded accelerometer signals in order to classify the activities of ambulatory subjects with incomplete spinal cord injury in a way that is specific to this population and the location of the recording-at home or in the clinic. METHODS: Subjects were instructed to perform a standardized set of movements while wearing a waist-worn accelerometer in the clinic and at-home...
February 6, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28162914/carrying-loads-validating-a-portable-tri-axial-accelerometer-during-frequent-and-brief-physical-activity
#11
G Zorrilla-Revilla, A Mateos, O Prado-Nóvoa, M Vidal-Cordasco, J Rodríguez
OBJECTIVES: The aim of this study is to evaluate the validity of the SenseWear Armband™ (SWA, Model MF-SW, BodyMedia Inc.) as a tool to assess daily brief, light- to moderate-intensity activities. DESIGN: A total of 41 volunteers were recruited (27 males, 14 females) to perform several trials, including a resting metabolic rate test and a number of walking trials while carrying different loads in a backpack. METHODS: Energy expenditure during trials was measured using both the SWA™ mini device, with the indirect calorimetry method (MasterScreen CPX and Oxycon Mobile JAEGER™ devices) used for validated comparative measurement...
January 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28153409/large-scale-centrifuge-test-of-a-geomembrane-lined-landfill-subject-to-waste-settlement-and-seismic-loading
#12
Edward Kavazanjian, Angel Gutierrez
A large scale centrifuge test of a geomembrane-lined landfill subject to waste settlement and seismic loading was conducted to help validate a numerical model for performance based design of geomembrane liner systems. The test was conducted using the 240g-ton centrifuge at the University of California at Davis under the U.S. National Science Foundation Network for Earthquake Engineering Simulation Research (NEESR) program. A 0.05mm thin film membrane was used to model the liner. The waste was modeled using a peat-sand mixture...
January 30, 2017: Waste Management
https://www.readbyqxmd.com/read/28149710/associations-of-objectively-measured-moderate-to-vigorous-intensity-physical-activity-and-sedentary-time-with-all-cause-mortality-in-a-population-of-adults-at-high-risk-of-type-2-diabetes-mellitus
#13
Kishan Bakrania, Charlotte L Edwardson, Kamlesh Khunti, Joseph Henson, Emmanuel Stamatakis, Mark Hamer, Melanie J Davies, Thomas Yates
The relationships of physical activity and sedentary time with all-cause mortality in those at high risk of type 2 diabetes mellitus (T2DM) are unexplored. To address this gap in knowledge, we examined the associations of objectively measured moderate-to-vigorous-intensity physical activity (MVPA) and sedentary time with all-cause mortality in a population of adults at high risk of T2DM. In 2010-2011, 712 adults (Leicestershire, U.K.), identified as being at high risk of T2DM, consented to be followed up for mortality...
March 2017: Preventive Medicine Reports
https://www.readbyqxmd.com/read/28146576/large-scale-population-assessment-of-physical-activity-using-wrist-worn-accelerometers-the-uk-biobank-study
#14
Aiden Doherty, Dan Jackson, Nils Hammerla, Thomas Plötz, Patrick Olivier, Malcolm H Granat, Tom White, Vincent T van Hees, Michael I Trenell, Christoper G Owen, Stephen J Preece, Rob Gillions, Simon Sheard, Tim Peakman, Soren Brage, Nicholas J Wareham
BACKGROUND: Physical activity has not been objectively measured in prospective cohorts with sufficiently large numbers to reliably detect associations with multiple health outcomes. Technological advances now make this possible. We describe the methods used to collect and analyse accelerometer measured physical activity in over 100,000 participants of the UK Biobank study, and report variation by age, sex, day, time of day, and season. METHODS: Participants were approached by email to wear a wrist-worn accelerometer for seven days that was posted to them...
2017: PloS One
https://www.readbyqxmd.com/read/28145419/usefulness-of-motion-sensors-to-estimate-energy-expenditure-in-children-and-adults-a-narrative-review-of-studies-using-dlw
#15
REVIEW
L B Sardinha, P B Júdice
It is well documented that meeting moderate-to-vigorous physical activity guidelines of 150 min per week is protective against chronic disease, and this is likely explained by higher energy expenditure (EE). In opposition, sedentary behavior (low EE) seems to impair health outcomes. There are gold standard methods to measure EE such as the doubly labeled water (DLW) or calorimetry. These methods are highly expensive and rely on complex techniques. Motion sensors present a good alternative to estimate EE and have been validated against these reference methods...
February 1, 2017: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28143463/monitoring-training-activity-during-gait-related-balance-exercise-in-individuals-with-parkinson-s-disease-a-proof-of-concept-study
#16
David Conradsson, Håkan Nero, Niklas Löfgren, Maria Hagströmer, Erika Franzén
BACKGROUND: Despite the benefits of balance exercise in clinical populations, balance training programs tend to be poorly described, which in turn makes it difficult to evaluate important training components and compare between programs. However, the use of wearable sensors may have the potential to monitor certain elements of balance training. Therefore, this study aimed to investigate the feasibility of using wearable sensors to provide objective indicators of the levels and progression of training activity during gait-related balance exercise in individuals with Parkinson's disease...
January 31, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28121795/change-in-sedentary-time-physical-activity-bodyweight-and-hba1c-in-high-risk-adults
#17
Matthew McCarthy, Charlotte L Edwardson, Melanie J Davies, Joseph Henson, Laura Gray, Kamlesh Khunti, Thomas Yates
PURPOSE: In recent years, there has been a migration towards the use of glycated hemoglobin (HbA1c) in determining glycemic control. This study aimed to quantify the associations between changes in body weight, sedentary time and moderate to vigorous physical activity (MVPA) time with HbA1c levels over a three year period among adults at high risk of type 2 diabetes. METHODS: This study reports baseline and three year follow-up data from the Walking Away from Type 2 Diabetes study...
January 24, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28117691/sisfall-a-fall-and-movement-dataset
#18
Angela Sucerquia, José David López, Jesús Francisco Vargas-Bonilla
Research on fall and movement detection with wearable devices has witnessed promising growth. However, there are few publicly available datasets, all recorded with smartphones, which are insufficient for testing new proposals due to their absence of objective population, lack of performed activities, and limited information. Here, we present a dataset of falls and activities of daily living (ADLs) acquired with a self-developed device composed of two types of accelerometer and one gyroscope. It consists of 19 ADLs and 15 fall types performed by 23 young adults, 15 ADL types performed by 14 healthy and independent participants over 62 years old, and data from one participant of 60 years old that performed all ADLs and falls...
January 20, 2017: Sensors
https://www.readbyqxmd.com/read/28113297/validation-of-energy-expenditure-prediction-models-using-real-time-shoe-based-motion-detectors
#19
Shih-Yun Lin, Ying-Chih Lai, Chi-Chun Hsia, Pei-Fang Su, Chih-Han Chang
OBJECTIVE: This study aimed to verify and compare the accuracy of energy expenditure (EE) prediction models using shoe-based motion detectors with embedded accelerometers. METHODS: Three physical activity (PA) data sets (unclassified, recognition, and intensity segmentation) were used to develop three prediction models. A multiple classification flow and these models were used to estimate EE. The "unclassified" data set was defined as the data without PA recognition, the "recognition" as the data classified with PA recognition, and the "intensity segmentation" as the data with intensity segmentation...
December 7, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28095956/decelerations-of-parachute-opening-shock-in-skydivers
#20
Kristofer Gladh, Riccardo Lo Martire, Björn O Äng, Peter Lindholm, Jenny Nilsson, Anton Westman
INTRODUCTION: High prevalence of neck pain among skydivers is related to parachute opening shock (POS) exposure, but few investigations of POS deceleration have been made. Existing data incorporate equipment movements, limiting its representability of skydiver deceleration. This study aims to describe POS decelerations and compare human- with equipment-attached data. METHODS: Wearing two triaxial accelerometers placed on the skydiver (neck-sensor) and equipment (rig-sensor), 20 participants made 2 skydives each...
February 1, 2017: Aerospace Medicine and Human Performance
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