Purpose: To provide objective measures of physical activity (PA) and eating behaviors (EB) using a single device. Person-worn cameras (PWC) offer the opportunity to classify and characterize multiple concurrent activities and their contexts, simultaneously; allowing for the objective classification of contextual and time-specific activities.
Methods: Two distinct populations, overweight females (...
Purpose: Compared to normal weigh and fit adolescents, overweight and unfit adolescents are more likely to develop cardiovascular disease in adulthood. Despite this, there is insufficient evidence regarding the effectiveness of general schoolbased interventions in these high-risk groups. We assessed if overweight/obese and unfit adolescents responded differently to a ...
Purpose: The onboard accelerometers and global positioning system (GPS) receivers on modern smartphones offer considerable promise for the unobtrusive tracking of physical activity (PA) in population research; however, the accuracy of smartphone sensors for assessing PA is uncertain. The purpose of this study was to compare estimates of PA and ...
Purpose: To quantify the proportion (%) of time spent in different body positions within incremental bands of accelerometer determined cadence (steps/min).
Methods: This was a secondary analysis of SenseCam camera images and ActiGraph GT3X+ accelerometer data concurrently worn during waking hours by 40 adults (70% male; 36±12 years-old; BMI=23±3 kg/m2) for 3...
Purpose: The objective of this study was to compare accelerometer data taken with an onboard accelerometer in a smartphone (Droid A855) with accelerations recorded by a stand-alone accelerometer (ActiGraph GT3x+).
Methods: A smartphone application was developed to record the time varying acceleration from the Droid’s onboard three dimensional ...
Purpose: To pilot test the Bluetooth based ZONITH Indoor Positioning System (IPS) and investigate if different indoor areas in a science museum are associated with different types of behavior.
Methods: 171 students (grade 6) were invited to participate in the study and were asked to wear a Bluetooth-enabled Global Positioning System (GPS) ...
Purpose: To investigate how schoolchildren use different schoolyard areas and whether these areas are associated with different types of behavior. Schoolyard characteristics seem to be related to behavior during recess, but exactly which behavior takes place where is unclear.
Methods: Time spent by 316 students (grade 5-8) in 5 types of schoolyard ...
Background: Measuring and increasing physical activity among commercial truck drivers is a health imperative due to elevated rates of obesity and associated health problems in the population. However, actigraphy measures of physical activity are likely inflated by large truck seat vibrations during driving periods.
Purpose: In preliminary studies recordings ...
Background: A need exists to identify effective approaches to increase compliance with physical activity interventions conducted in community settings.
Purpose: To use accelerometry to analyze the effects of bi-weekly, theoretically based motivational text messages on premenopausal women’s compliance to a walking intervention.
Methods: Premenopausal women (n=52, 37.2 ± 6.2 years, 80.8% Caucasian) wore ...
Background: Previous research has shown that children are not getting the recommended amount of physical activity (PA) at school. This may be due to a lack of motivation, not having the opportunity, or not enjoying the activities available. Improving the PA levels during school can help reverse the trend of ...