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Commentaries on Viewpoint: Expending our physical activity (measurement) budget wisely.

TO THE EDITOR: The authors of “Expending our physical activity (measurement) budget wisely” (2) discussed and provided data on potential pitfalls with using self-reported physical activity (PA) to understand interactions with health. The authors rightfully suggest that despite the major efforts placed into developing reliable and valid questionnaires, they remain largely inaccurate for the majority of adults (1). The error is thought to originate from a disproportionate focus on volitional type exercise (biking, jogging, and walking), while not capturing low to moderate intensity movements that accumulate a significant proportion to total activity energy expenditure (6). However, while I agree with the author’s conclusions, the use of self-reported behaviors will remain a staple in telephonebased and large epidemiological studies. We simply can’t ask for objectively measured PA in such designs and we can’t afford to lose this vital information for understanding demographics of PA at a global level. As an example, there are several national and international studies that will continue to use such methodology for understanding PA and health (3, 5). Therefore, improved questionnaires should be created to enhance capturing nonexercise (household chores, standing, walking for purpose) and sedentary behaviors (sitting or lying) that are uniquely associated with public health. The inclusion of such behaviors in these questionnaires will help distinguish types of activities that might have a critical role in health and potentially distinct interactions with volitional exercise. The development of such questionnaires is ongoing for these purposes (4).