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Background: According to the US Institute of Medicine guideline, preschool-aged children should participate in ≥15 minutes of physical activity (PA) per hour or 3 hours per day over 12 hours. Examinations of PA guideline compliance to date averaged time spent in PA over several days; however, children could exceed the guideline on some days and not on others. Therefore, this cross-sectional study examined PA guideline compliance in preschool children based on number of minutes per hour (average method) and percentage of days the guideline was met (everyday method). Methods: PA was measured by accelerometry during the preschool day for up to 10 days in 177 children (59.3% males, Mage = 4.23). Minutes per hour and percentage of time in light, moderate to vigorous, and total PAs were calculated. Percentage of days in compliance was determined by number of days in compliance (defined as the child active on average ≥15 min/h) divided by total accelerometer days. Results: Children engaged in PA, on average, 17.01 minutes per hour, suggesting that on average, children are meeting the guideline. However, children were only in compliance with the PA guideline 62.41% of assessment days. Conclusions: Findings demonstrate the importance of examining compliance with both the average and everyday methods to more accurately portray level of Institute of Medicine PA guideline compliance.

Background Preschool ADHD symptoms have predictive utility for later presence of ADHD diagnoses (Harvey, Youngwirth, Thakar, & Errazuriz, 2009, Journal of Consulting and Clinical Psychology, 77, 349; Lahey et al., 2004, American Journal of Psychiatry, 161(11), 2014), yet some level of inattention, hyperactivity, and impulsivity are present even in typically developing preschoolers. Physical activity (PA) is known to have a broad spectrum of positive effects on the brain in school‐age typically developing children (Centers for Disease Control and Prevention, 2010, The association between school based physical activity, including physical education, and academic performance. Atlanta, GA: U.S. Department of Health and Human Services), including functions impaired by ADHD (Halperin, Berwid, & O'Neill, 2014, Child and Adolescent Psychiatric Clinics of North America, 23, 899), yet links between PA and ADHD levels and impairments have rarely been studied in either typically developing or at‐risk preschool children. Importantly, impaired processing speed (PS), though not a symptom of ADHD, is a robust neuropsychological correlate (Willcutt & Bidwell, 2011, Treating attention deficit hyperactivity disorder: Assessment and intervention in developmental context. Kingston, NJ: Civic Research Institute) that may indicate additional risk for ADHD. Hence, we examined whether baseline PS moderates the association between preschoolers' PA, specifically moderate‐to‐vigorous PA (MVPA), and changes in ADHD levels and related behaviors. Method Eighty‐five preschoolers (49.4% female; Mage = 4.14, SDage = .64) were drawn from a larger study of the effects of the Kiddie Children and Teachers (CATs) on the Move PA program on school readiness. The sample was largely Head Start eligible (68.2%) and ethnically diverse. Hierarchical regressions were utilized to examine links between MVPA, averaged over a school year, and changes in inattention (IA), hyperactivity/impulsivity (HI), oppositional behaviors, moodiness, and peer functioning, and whether these associations varied based on baseline PS. Results Results indicated that for IA, HI, and peer functioning, higher amounts of MVPA were associated with greater adaptive change for those with lower (but not higher) levels of PS. Conclusions Preschool MVPA may be a viable method of reducing ADHD levels and impairments for those with lower PS.

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