Research Database


Characterization and Agreement Between Application of Mobile Ecological Momentary Assessment (mEMA) and Accelerometry in the Identification of Prevalence of Sedentary Behavior (SB) in Young Adults

  • Published on April 9, 2019

Introduction Sedentary behavior (SB) is defined as any activity performed during “awake” time with low energy expenditure (equal to or below 1.5 metabolic equivalents – MET’s) in a sitting or reclining position (Sedentary Behaviour Research Network, 2012; Tremblay et al., 2017). Studies have shown that this behavior is highly prevalent among adults, and ...



A study investigating the validity of an accelerometer in quantification of step count in adult hospital inpatients recovering from critical illness

  • Published on February 14, 2019

Objective To determine the validity of the ActiGraph GT3X accelerometer in step count quantification when compared to observed step count in hospitalised adults recovering from critical illness. Setting Large National Health Service (NHS) Hospitals Trust. Subjects In total, 20 hospital ward-based adults (age: mean 62.3, SD 11.5) who had required greater than 48 ...


Changes in Intensity and Duration of Walking among Older Adults from In-Patient Geriatric Rehabilitation to Home

  • Published on October 15, 2018

Purpose We compared walking in hospital and on discharge from in-patient geriatric rehabilitation. Method: Participants included 28 adults (22 women) with a mean age of 85.4 (SD 6.8) years, ambulating independently with planned discharge to the community. Steps per day, short and long walking bouts, and cadence (steps per minute) were measured using an ...


A Pilot Study on Energy Expenditure Estimation Through Decision Modeling

  • Published on February 28, 2019

The generation of standardized equations for predicting energy expenditure, to be applied to every healthy individual, is still subject to research. The purpose of this study was to contribute to the development of a decision algorithm to estimate energy expenditure for its application over a wide range of physical activities. ...


Validity of three accelerometers to investigate lying, sitting, standing and walking

  • Published on May 23, 2019

Background: Hospital stays are associated with high levels of sedentary behavior and physical inactivity. To objectively investigate physical behavior of hospitalized patients, these is a need for valid measurement instruments. The aim of this study was to assess the criterion validity of three accelerometers to measure lying, sitting, standing and ...


Measuring Time in the Office Using Bluetooth Sensors: Feasibility and Validity Considerations

  • Published on Mar, 2019

The office is a key setting for intervening to reduce sitting, therefore office-specific activity measures are needed to evaluate interventions. We tested whether valid measures of office time and office-specific activities could be obtained using Bluetooth sensing with a variety of sampling intervals, receiver wear positions, and beacon placements. Workers ...


Differences in sleep between concussed and nonconcussed college students: a matched case–control study

  • Published on 17 Nov, 2018

Study Objectives: To describe sleep 2–3 days postconcussion through symptom recovery and make comparison to well-matched nonconcussed controls. Methods: Twenty college students were physician diagnosed with a concussion and compared with 20 nonconcussed controls matched on age, sex, physical activity, and sleep quality. A wrist-worn ActiGraph GT9X Link was provided during ...


Actigraphy-based sleep estimation in adolescents and adults: a comparison with polysomnography using two scoring algorithms

  • Published on Jan 18, 2018

Objectives: Actigraphy is widely used to estimate sleep-wake time, despite limited information regarding the comparability of different devices and algorithms. We compared estimates of sleep-wake times determined by two wrist actigraphs (GT3X+ versus Actiwatch Spectrum [AWS]) to in-home polysomnography (PSG), using two algorithms (Sadeh and Cole-Kripke) for the GT3...