Research Database

Contemporaneous Assessment Of Physical Activity, Sedentary Behavior And Sleep Using An Actigraph GT3X+ Accelerometer

  • Presented on June 18, 2013

Introduction Physical activity (PA), sedentary behavior (SB) and sleep form the behavioral tripartite of energy expenditure and appear inter- and independently related to cardiometabolic disease and cancer. The ability to collect valid data on all three behaviors contemporaneously using one type of accelerometer is important because it may improve our ...


Inferred Time In Bed Independently Predicts Levels Of Daytime Activity And Sedentary Behavior

  • Presented on June 17, 2013

Purpose Increased all-cause mortality has been consistently associated with longer (8-10 hours+) self-reported sleep duration. The possibility that longer sleep may impact survival through inactive lifestyles was proposed by Morgan (2007), and subsequently tested by Hartescu et al (2012) who concluded that, independent of health status, longer sleep duration, and the inevitably ...


Assessing The Bidirectional Relationship Between Physical Activity And Sleep In Elderly Women

  • Presented on May 29, 2013

A physically active lifestyle and quality sleep are associated with lower risk for obesity and cardiovascular disease. Cross-sectional studies demonstrate that greater physical activity (PA) is associated with better quality sleep. However, few studies have examined this relationship using objective measures. Additionally, few studies have examined the directionality of the ...


Sedentary/active Behaviors And Cardiometabolic Risk: Protective Effects Of Sleep Duration, Nhanes 2005-2006

  • Presented on May 29, 2013

Optimal sleep duration (7-8h), moderate-to-vigorous intensity physical activity (MVPA) and light-intensity activity are beneficially associated with cardiometabolic outcomes and related biomarkers, while sedentary time and long (≥9h) or short (<7h) sleep duration are detrimentally associated. Purpose This study examined whether sleep duration modified the relationship between both sedentary/...


The Relationship between Objectively Measured Sleep and Diet Quality in College Women

  • Presented on May 30, 2013

Objective The purpose of this study was to examine the relationship between sleep (duration and quality) and diet quality among young adult women. Subjects: Three-hundred seventy-five women (18-24 years) were recruited to participate in the study. Measurement Each participant wore an actigraph for 7 consecutive nights to measure sleep. Sleep logs ...


The Relationship Between Sleep Deprivation And The Energy Balance Pathways Of Diet And Physical Activity

  • Presented on May 30, 2013

Purpose To examine the energy balance pathways of diet and physical activity under conditions of acute sleep deprivation in normal-weight and obese women. Methods In counter-balanced fashion, 22 normal-weight (30.9±9.5 yrs, 22.0±1.6 kg/m2) and 18 obese (29.7±10.7 yrs, 36.4±5.3 kg/m2) women, with a consistent sleep-wake cycle, completed two separate free-living sleep conditions (Condition 1: one ...


Measure of sleep and physical activity by a single accelerometer: Can a waist-worn Actigraph adequately measure sleep in children?

  • Published on October 2012

Purpose Accelerometers could potentially be used to assess physical activity and sleep using the same monitor; however, two different positions are typically used for the assessment of physical activity and sleep (waist and wrist, respectively). The aim of this study is to evaluate the concordance between wrist- and waist-worn Actigraphs ...



Relationship Between Sleep and Next Day Physical Activity

  • Presented on May 30, 2013

Objective The purpose of this study was to examine the effect that sleep duration and quality has on next day physical activity among a population of young adult women. Subjects: Three-hundred and seventy-five women (18-24 yrs) were recruited to participate in the study. Measurements Each participant wore an accelerometer for 7 ...