Research Database

18 results for "Pattern Recognition"

Predicting Activity Type from Accelerometer Data in Older Adults

  • Presented on June 17, 2013

Introduction Assessing time spent in different activity types may be important for early detection of mobility limitations in older adults. To date, accelerometer-based activity type prediction using machine learning algorithms have not been validated for this segment of the population. Therefore, the aim of this study was to use Random ...


Recognizing Physical Activity Patterns Individually Using Hidden Markov Models

  • Presented on May 31, 2013

Accelerometers offer valid and objective measures to assess free-living physical activity (PA) (Kodama et al, 2002; Lyden et al, 2012). While these devices provide rich information with frequent readings over a period of time, the large amount of data is difficult to analyze and special techniques to extract features are needed. Summarizing ...


Objectively Measured Physical Activity in the 1993 Pelotas (Brazil) Birth Cohort

  • Added on December 3, 2012

Introduction Data on physical activity levels of adolescents are mostly derived from self-reported instruments, and the vast majority of studies using objective measures are from high-income countries. The aim of this study was to describe the patterns of objectively measured physical activity in Brazilian adolescents. Methods In 2004–2005 (mean age of 13.3 ...


The Influence of Daily Physical Activity in Total Antioxidant Capacity and Oxidative DNA Damage, in Human Lymphocytes

  • Added on July 5, 2012

Introduction The study of physical exercise benefits in health is well documented in the literature. Some of the proposed mechanisms that explain organism function enhancement are related with bioenergetics and mitochondria improvement, associated with decrease in ROS production and increase e antioxidant capacity. As a consequence, oxidative damage tends to ...


The Contribution of Parks to Physical Activity

  • Added on June 15, 2012

Purpose The aim of this study was to develop objective measures of park use and to describe patterns of park use and its association with moderate-to-vigorous physical activity (MVPA) among adults. Methods From five US states, 238 adults were enrolled in or near 31 study parks. Participants wore a global positioning system (...


Hotspots for Schoolyard Physical Activity – Using GPS, Accelerometry and GIS

  • Added on June 15, 2012

Purpose A number of recent studies have found associations between the characteristics of schoolyards and the level of PA of schoolchildren using the schoolyards. Based on these findings, it seems likely that making schoolyards more attractive will help to increase the total amount of PA among schoolchildren. Before starting our ...



Accelerometer Derived Movement Pattern Differences Across Age

  • Presented on 2011

Introduction Pattern recognition classification algorithms have successfully identified energy cost and activity type from hip-worn accelerometers (ACC) [1,2]. These algorithms evaluate attributes of the acceleration signal during high frequency sampling. ACC output similarities and differences across activity types are well characterized [3]. An often overlooked area of potential difference lies in movement ...