title: Financial motivation undermines maintenance in an intensive diet and activity intervention.
abstract: Financial incentives are widely used in health behavior interventions. However, self-determination theory posits that emphasizing financial incentives can have negative consequences if experienced as controlling. Feeling controlled into performing a behavior tends to reduce enjoyment and undermine maintenance after financial contingencies are removed (the undermining effect). We assessed participants' context-specific financial motivation to participate in the Make Better Choices trial-a trial testing four different strategies for improving four health risk behaviors: low fruit and vegetable intake, high saturated fat intake, low physical activity, and high sedentary screen time. The primary outcome was overall healthy lifestyle change; weight loss was a secondary outcome. Financial incentives were contingent upon meeting behavior goals for 3 weeks and became contingent upon merely providing data during the 4.5-month maintenance period. Financial motivation for participation was assessed at baseline using a 7-item scale (α = .97). Across conditions, a main effect of financial motivation predicted a steeper rate of weight regained during the maintenance period, t(165) = 2.15, P = .04. Furthermore, financial motivation and gender interacted significantly in predicting maintenance of healthy diet and activity changes, t(160) = 2.42, P = .016, such that financial motivation had a more deleterious influence among men. Implications for practice and future research on incentivized lifestyle and weight interventions are discussed.
authors.affiliation: Department of Preventive Medicine, Northwestern University, Chicago, IL 60611, USA.
authors.forename: Arlen C
authors.initials: AC
authors.lastname: Moller
authors.forename: H Gene
authors.initials: HG
authors.lastname: McFadden
authors.forename: Donald
authors.initials: D
authors.lastname: Hedeker
authors.forename: Bonnie
authors.initials: B
authors.lastname: Spring