Date: January 7, 2015
Time: 12:00 am - 12:00 am
Location: Richmond Road Diagnostic and Treatment Centre - Solarium


Ted Pfister, MSc


Convergent Validity and Test Re-Test Reliability of Two Accelerometers for Measuring Physical Activity and Sedentary Behaviour in a Healthy Population of Older Women


Understanding the role of physical activity and sedentary behaviour in disease etiology is being recognized as increasingly important because of the accumulating evidence regarding the association between these behaviours and health. At present, methods for quantifying physical activity and sedentary behaviours in epidemiologic studies can involve self-reported questionnaires or direct observations. An important aspect of physical activity and sedentary behaviour research involves quantifying these behaviours more accurately given some of the recognized limitations of self-report methods. Accelerometry has enabled the objective quantification of both physical activity and sedentary behaviour. The appropriate choice of accelerometer for epidemiologic studies that seek to measure these behaviours objectively depends on several factors; the most important are the validity and reliability of the estimates obtained.The purpose of this study was to provide empirical evidence on the convergent validity and behavioural variation (test re-test reliability) of two leading accelerometry devices (ActiGraph® GT3X Plus and the activPAL3®) that were used in the Breast Cancer and Exercise Trial in Alberta (BETA Trial).

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