![]() The Youth Compendium provides such a resource to ascribe physical activity intensity levels to nearly 200 activities in which children and youth participate. Regardless of the method used, knowing the intensity level of the physical activities in which children and youth participate can help researchers and practitioners understand patterns of physical activity, prescribe an optimal amount of physical activity, and encourage participation in physical activity. Wearable monitors record body movements to estimate frequency, duration, and intensity of activities performed and can identify the time spent in light-, moderate-, and vigorous-intensity physical activities. These questionnaires require children and youth to identify their activities or have parents serve as a proxy reporter for their young children. Questionnaires can identify the type, frequency, intensity, and setting of physical activities completed. McKenzie, Smith NJ, 2017) and can scan physical activity behaviors in play spaces ( Ward, 2014). Systematic observation systems can identify physical education teacher behaviors and related student physical activity engagement in classrooms ( T. There are several methods available to estimate physical activity in children and youth. Experimental trials demonstrate effective ways to increase physical activity occurring during school, home, and community settings and as part of transportation activities ( Beets, 2016 van Sluijs, 2007). In addition to monitoring guidelines in high school students at a national level ( Office of Disease Prevention and Health Promotion, 2018b), cross-sectional and longitudinal studies show the proportion of children and youth who meet these guidelines ( Barr-Anderson, 2017 Fakhouri, 2014 Gahche, 2014 Katzmarzyk, 2016). In 2008, the Physical Activity Guidelines for Americans identified physical activity goals for youth to include 60 minutes per day of physical activity, with vigorous-intensity activities, muscle strengthening, and bone-loading activities performed at least 3 days per week ( Office of Disease Prevention and Health Promotion, 2018a). Department of Health and Human Services, 2008). Accordingly, experts have led efforts to identify the amount of physical activity children and youth obtain on a daily basis and to understand the relationships between physical activity and health outcomes in youth ( U.S. Despite this interest, changes in access to physical education in schools, physical activity in communities along with increased opportunities for sedentary behaviors have paralleled the rise in child and youth overweight and obesity ( Commission on Ending Childhood Obesity, 2016). Department of Health and Human Services, 2018). Since the development of the President’s Council on Sports, Fitness, and Nutrition in 1956, educators and healthcare professionals have been interested in improving levels of physical activity and physical fitness of America’s children and youth ( U.S.
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