Reconsidering the experience machine: Self-reported versus objective measures of physical activity to increase...

This article tests the utility of self-report and objective assessment of physical activity to predict increased positive affect. Participants wore Fitbit activity trackers and responded to single-item assessments of momentary affect and self-reported physical activity following an experience sampling method protocol. A test of the within-person mediation indicated that, on average, 63 percent of the relationship between objective physical activity and affect was accounted for by self-reported physical activity. This research adds to the body of literature demonstrating the benefits of physical activity and discusses the utility of perceived over actual assessments of physical activity in naturalistic settings.