title: Validation of an instrument for measurement of physical activity in youth.
abstract: This study assessed the reliability and validity of the Previous Day Physical Activity Recall (PDPAR), a self-report instrument designed to measure physical activity in youth. Subjects were randomly selected students in grades 7-12. Test-retest reliability was reported as the correlation between estimated relative energy expenditures determined from two PDPAR administrations completed within 1 h. Interrater reliability was determined by two observers using the scoring protocol. Validity was assessed using footstrikes (pedometer), Caltrac activity counts, and heart rate monitoring as criterion measures. Interrater and test-retest reliability was 0.99 and 0.98, respectively (P < 0.01). The correlation between relative energy expenditure from the PDPAR (kcal.kg-1.l.d-1) and pedometer and Caltrac counts was 0.88 (P < 0.01) and 0.77 (P < 0.01), respectively. The correlation between percentage heart rate range (HRmax-HR-rest) and mean energy expenditure from the PDPAR was 0.53 (P < 0.01). The correlation between 1-min heart rates > 50% HRR sustained for 20 min and the number of 30-min blocks with a relative energy expenditure of at least four metabolic equivalent tasks (MET) was 0.63 (P < 0.01). The PDPAR provides valid and reliable estimates of physical activity and also accurately identifies bouts of moderate to vigorous activity.
authors.affiliation: Department of Exercise Science, University of South Carolina, Columbia 29208, USA.
authors.forename: A T
authors.initials: AT
authors.lastname: Weston
authors.forename: R
authors.initials: R
authors.lastname: Petosa
authors.forename: R R
authors.initials: RR
authors.lastname: Pate
mesh_terms: D000293:Adolescent; D004734:Energy Metabolism; D015444:Exercise / Q000502:physiology; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D011939:Mental Recall; D008991:Monitoring, Physiologic; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires