Method: Participants were 162 fouth through sixth grade children (96 boys; Mage=11.26) from an urban elementary school where no physical education class was offered. Participants responded to a validated questionnaire assessing their global self-esteem (Rosenberg, 1965), and their baseline 7-day PA levels were assessed by SPARK activity checklist in September 2010 (pretest). The fourth graders (n=53) were then placed to the intervention group engaging in 30 min. DDR-based exercise (e.g., DDR, and aerobic dance) three times per week, while the fifth (n=75) and sixth graders (n=34) were assigned to the comparison group without performing any structured exercise at the school. The identical measurements were taken again in May 2011 (post-test).
Analysis/Results: ANOVA with repeated measures for self-esteem revealed no significant difference on self-esteem between the intervention children and the comparison children, F (1, 95) = .34, p = .56, η2 = .01. However, ANOVA with repeated measures for PA indicated a significant main effect for intervention, F (1, 108) = 18.75, p < .01, η2= .15. In particular, the intervention children had significantly greater increased PA levels than the comparison children across time.
Conclusions: The implementation of the DDR-based exercise program over one school year has no significant effect on children’s self-esteem. The specific reasons of this observation deserve further investigation through in-depth qualitative methodologies. On the other hand, the exercise program demonstrates a significantly positive effect on the intervention children’s 7-day PA levels as compared to the comparison children. Therefore, we conclude that DDR can be implemented as a good alternative physical activity program at elementary schools.
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