| Summary: | A The PROMIS<sup>®</sup> Pediatric Physical Activity (PA) measure is a new instrument with established validity that measures a child self-report on short bouts of moderate to rigorous physical activity. The purpose of this study was to explore the relationship of the PROMIS<sup>®</sup> Pediatric PA item bank with cardiorespiratory fitness and self-efficacy. The study was conducted at the Minnesota State Fair. Youth ages 8 to 18 years completed the PROMIS<sup>®</sup> Pediatric PA and the Self-Efficacy for PA measures on an iPad. Participants performed 3-min step test with heart rates measured 1 min posttest. Participants (N = 182) were 53% female. The PROMIS<sup>®</sup> Pediatric PA had a weak, significant negative correlation with the step test measurement <i>(r</i> = −0.23, <i>p</i> = 0.001) and a weak, significant positive correlation with self-efficacy (<i>r</i> = 0.27, <i>p</i> < 0.001). Measurements did not differ between groups by sex or age group (school-age and adolescent). Youth who were obese had significantly higher heart rates post step test (<i>p</i> = 0.004); BMI percentile groups did not differ in other measures. Self-report of PA and the physiologic measure of heart rate are from two related but different physical fitness domains which supports their significant but weak relationship.
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