Search again

53 Results for: "Activity and Technology"

Step-Based Physical Activity Metrics and Cardiometabolic Risk: NHANES 2005–2006

  • Published on Feb 2017

Purpose: This study aimed to catalog the relationships between step-based accelerometer metrics indicative of physical activity volume (steps per day, adjusted to a pedometer scale), intensity (mean steps per minute from the highest, not necessarily consecutive, minutes in a day; peak 30-min cadence), and sedentary behavior (percent time at zero ...


EASY – An Instrument for Surveillance of Physical Activity in Youth

  • Published on Jun 21, 2017

There is a need for a self-report instrument, with sound psychometric properties, for monitoring compliance with physical activity guidelines in youth. This study aimed to develop such an instrument by applying Item Response Theory as well as traditional methods for assessing validity and reliability. Focus groups, conducted with 162 middle school ...


Statistical modeling of circadian rhythms of physical activity

  • Published on Jun 21, 2017

Purpose: The proposed symposium will introduce novel and intuitive statistical methods for modeling the human circadian rhythm based on data collected using body-worn physical activity monitors. All methods are motivated by and applied to large observational studies. Rationale: Biological rhythms have been under intense methodological development across all disciplines of ...


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 ...