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The purpose of the study was to examine the effectiveness of “ efitbuddy, ” a theory-based smartphone application, on young adults’ BMI, physical activity, and motivation across a 4-week intervention. Participants were a convenience sample of 312 (mean age = 19.4 ± 2.3 years) college students. A quasi-experimental design with the control group was used to examine the effects of “ efitbuddy”  on BMI, physical activity, and motivation. Participants in the intervention group downloaded “ efitbuddy ” and used it daily for a four-week period. Outcome measures included BMI, Physical Activity Questionnaire (PAQ) scores, self-efficacy, and enjoyment, collected at baseline and posttest timepoints. Mixed effects models yielded no significant improvements in BMI ( p  = .725), PAQ scores ( p  = .745), self-efficacy ( p  = .301), or enjoyment ( p  = .104). The 4-week “ efitbuddy ” intervention did not yield improvements in BMI, physical activity, or motivation in a sample of college students. These null findings are congruent with other smartphone interventions attempting to promote behavior change.

Efficacy of a 4-Week Smartphone Application Intervention on College Students’ BMI, Physical Activity, and Motivation