Degree Type


Date of Award


Degree Name

Master of Science



First Advisor

Gregory J. Welk


The Youth Activity Profile (YAP) is an online physical activity (PA) assessment tool to assess children's PA at school (PAS), PA at home (PAH) as well as sedentary behavior (SED). To date, no primary study has evaluated the utility of the YAP for use in school physical education programs. Purpose: The primary purpose of this study was to evaluate grade and gender-related patterns of YAP scores in a large sample of 5th to 8th grade school children. A secondary goal was to examine relationships between PA levels and sedentary behavior and field measures of physical fitness (PF). Methods: Data were collected through a participatory network of schools that receive training and support through the FITNESSGRAM program. A total of 3165 youth from 31 elementary and middle schools completed the YAP and a total of 5339 youth from the same schools completed the FITNESSGRAM test. Age and gender differences in YAP scores were tested by a two way (grade x gender) mixed model analyses of variance. Data from the YAP and FITNESSGRAM were also aggregated by grade level and combined to examine associations between PA and PF. Partial correlations (Pearson) were used to control for school level clustering. Results: Significant main effects were found for gender (F = 66.20, p <0.0001) and grade (F = 4.40, p<0.01) for PAS. Similar main effects were observed for PAH (gender: F = 31.41, p <0.0001; grade: F = 8.28, p<0.0001) but the interaction term was also statistically significant (F (3, 3120) = 5.85, p <0.01]. Boys were found to be more active than girls and activity is higher among younger than older children. A significant main effect for grade (F = 13.39, p <0.0001) was found for SED but non-significant effects were found for gender and the interaction. The PAS indicator had a significant positive correlation with aerobic capacity (r=0.42, p<0.01) and a significant negative correlation with BMI (r=-0.34, p<0.05). The SED indicator had a significant negative correlation with aerobic capacity (r=-0.29, p<0.05) and a significant positive correlation with BMI (r=0.66, p<0.01). Conclusions: The YAP is able to capture the typical PA and SED patterns. The relatively high correlations between PA, SED, and PF support the validity of the YAP. The YAP provides a useful tool to facilitate evaluation and tracking of physical activity in school and at home. The web-based features and easy data management offer promise for use of YAP in large school-based tracking studies or population surveillance.


Copyright Owner

Yang Bai



File Format


File Size

75 pages

Included in

Kinesiology Commons