Research Database

38 results for "Accelerometer"

Comparison of Two Generations of ActiGraph Accelerometers: The CARDIA Study

  • Published on Jun 2018

Purpose: This study aimed to examine the comparability of the ActiGraph 7164 and wGT3X-BT wear time, count-based estimates, and average time per day in physical activity of different intensities. Methods: We studied 87 Coronary Artery Risk Development in Young Adults (CARDIA) participants 48-60 yr of age who simultaneously wore the 7164 and ...


Association of physical activity with lung function in lung-healthy German adults: results from the KORA FF4 study

  • Published on December 28, 2018

BACKGROUND In lung disease, physical activity (PA) yields beneficial health effects, but its association with the function of healthy lungs has rarely been studied. We investigated the association of accelerometer-based PA with spirometric indices, maximal inspiratory mouth pressure (PImax) and lung diffusion capacity in lung-healthy adults. METHODS In total, 341 apparently ...



Changes in Physical Activities and Body Composition after Roux-Y Gastric Bypass Surgery

  • Published on December 22, 2017

PURPOSE Given the importance of physical activities for health outcomes, it is still unclear whether bariatric surgery per se and the standard care after surgery would result in an increase of physical activity level. This study aimed to determine physical activities preoperatively and at 6 and 12 months postoperatively among female patients ...


Calibration of the global physical activity questionnaire to Accelerometry measured physical activity and sedentary behavior

  • Published on March 27, 2018

Background Self-report questionnaires are a valuable method of physical activity measurement in public health research; however, accuracy is often lacking. The purpose of this study is to improve the validity of the Global Physical Activity Questionnaire by calibrating it to 7 days of accelerometer measured physical activity and sedentary behavior. Methods ...


Estimating Energy Expenditure with ActiGraph GT9X Inertial Measurement Unit.

  • Published on May 2018

Purpose: The purpose of this study was to explore whether gyroscope and magnetometer data from the ActiGraph GT9X improved accelerometer-based predictions of energy expenditure (EE). Methods: Thirty participants (mean ± SD: age, 23.0 ± 2.3 yr; body mass index, 25.2 ± 3.9 kg·m) volunteered to complete the study. Participants wore five GT9X monitors (right ...


Change in Physical Activity During Active Treatment of Cardiac Patients

  • Published on April 2017

Abstract: Sedentary secular, domestic, and recreational behaviour is a major risk factor (RF) for cardiovascular disease (CVD). This study examines the quality of at-home physical activity (PA) and how it relates to physical fitness (PF) before and during 12 weeks of supervised cardiac rehabilitation (CR) in a group of medically referred ...


Age- and sex-related differences in heart rate variability are present despite the suitable level of accelerometer-based physical activity

  • Published on May 2015

Background: Previous studies have described the age- and sex-related differences in heart rate variability (HRV) regardless of the level of physical activity in daily life (PADL). However, such studies were based in the assessment of PADL by means of questionnaires, which present important recall limitations. The influence of age and ...


The Impact of Low Accelerometer Wear Time on the Estimates and Application of Sedentary Behavior and Physical Activity Data in Adults

  • Published on Dec 12, 2017

Background: This investigation sought to determine how accelerometer wear (1) biased estimates of sedentary behavior (SB) and physical activity (PA), (2) affected misclassifications for meeting the Physical Activity Guidelines for Americans, and (3) impacted the results of regression models examining the association between moderate to vigorous physical activity (MVPA) and a clinically relevant ...


Physical Activity Assessment with the ActiGraph GT3X and Doubly Labeled Water

  • Published on Sep 2017

Purpose: To compare the degree to which four accelerometer metrics-total activity counts per day (TAC per day), steps per day (steps per day), physical activity energy expenditure (PAEE) (kcal·kg·d), and moderate- to vigorous-intensity physical activity (MVPA) (min·d)-were correlated with PAEE measured by doubly labeled water (DLW). ...