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51 Results for: "Activity and Technology"

Physical Activity in Pediatric Pulmonary Arterial Hypertension Measured by Accelerometry: A Candidate Clinical Endpoint

  • Published on Jul 15, 2017

Background Although the six-minute walk distance is well established as a clinically relevant endpoint for adults with pulmonary arterial hypertension (PAH), this endpoint is less applicable to infants and children who may be unable to participate in such testing. Thus, there is a critical need to develop and validate means ...


Moderate Physical Activity is Associated with Cerebral Glucose Metabolism in Adults at Risk for Alzheimer’s Disease

  • Published on Jun 23, 2017

The objective of this study was to investigate the relationship between accelerometer-measured physical activity (PA) and glucose metabolism in asymptomatic late-middle-aged adults. Ninety-three cognitively healthy late-middle-aged adults from the Wisconsin Registry for Alzheimer’s Prevention participated in this cross-sectional study. They underwent 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) imaging and wore ...


Using Bluetooth proximity sensing to determine location in a workplace

  • Published on Jun 21, 2017

Most wearable devices that measure sedentary and active time in workplaces cannot determine the context of that time. The ActiGraph wGT3X-BT and Link models allow users to not only measure movement but the wearer's location relative to a beacon using Bluetooth proximity detection. This function has yet to be ...


Estimating energy expenditure during outdoor level walking using Global Positioning System or accelerometry in patients with peripheral artery disease

  • Published on Jun 21, 2017

Introduction. Estimating energy expenditure (EE) related to outdoor walking capacity in peripheral artery disease (PAD) patients could allow a better standardization of the assessment of their limitations during free-living outdoor walking. However, there is no data regarding the accuracy of ambulatory methods to perform such estimations. Our aim was to ...


Utility of ActiGraph wear sensor in assessing wear-time in 24-hour wrist measurement

  • Published on Jun 21, 2017

There are no standard procedures for identifying wake wear, sleep wear and non-wear time from the 24-h accelerometer recordings. Participant diaries increase participant burden and frequently have missing values. The Choi algorithm identifies 90-min consecutive zero counts as non-wear time, allowing for 2 minutes of non-zero counts, thus possibly ignoring short ...


More high intensity physical activity in the population with new method to process ActiGraph accelerometer data

  • Published on Jun 21, 2017

Introduction: Our research group has developed the processing of raw acceleration data to ActiGraph counts for improved assessment of high intensity physical activity. The aim of the present study was to apply this new processing method to large population data and investigate the effect on physical activity compared to the ...


Comparing methods for creating an overall physical activity estimate from multiple accelerometer days

  • Published on Jun 21, 2017

Background: Accelerometers provide an objective assessment of physical activity and are frequently deployed for at least multiple days. However, it is unclear how to summarize multiple days into one overall physical activity estimate, particularly in the presence of missing data. This study compared summarization method prediction and precision, and the ...


Free-living dynamic skeletal loading estimation using tri-axial accelerometers

  • Added on July 14, 2017

Hip bone mineral density (BMD) is an important biomarker of fracture risk, but as a standalone measure it lacks information on modifiable causal factors. The relationship between hip BMD and physical activity (PA)-based skeletal loading estimates could provide a biomarker for prescribing PA changes in high risk patients. Ten ...


Multilevel functional methods for modeling actigraphy data and its application to predicting mortality in the US population

  • Published on Jun 21, 2017

We will present the results of analysis of physical activity data collected with accelerometers on 10000+ subjects in National Health and Nutrition Examination Survey (NHANES), a nationally representative sample of the US population. The data have been analyzed with recently developed multilevel functional data analysis approaches that focus on modeling variability ...


Validity and Reliability of Fitbit Flex for Step Count, Moderate to Vigorous Physical Activity and Activity Energy Expenditure

  • Published on Sep 2, 2016

Objectives: To examine the validity and reliability of the Fitbit Flex against direct observation for measuring steps in the laboratory and against the Actigraph for step counts in free-living conditions and for moderate-to-vigorous physical activity (MVPA) and activity energy expenditure (AEE) overall. Methods: Twenty-five adults (12 females, 13 males) wore a Fitbit ...