Abstract
Introduction: Global Positioning Systems (GPS) are an objective measure of physical activity that is more accurate than self-report and provide contextual information of where activities occur, which pedometers and accelerometers are unable to do. Traditional GPS units are expensive and unavailable to the general population, limiting their use in encouraging and promoting physical activity. Therefore, this study assessed the validity and reliability of an iPhone™ ‘app’ to monitor distance, intensity and context of physical activity compared with a sport specific unit.
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