Design and protocol of the weight loss lottery- a cluster randomized trial

Swaluw, Koen van der; Lambooij, Mattijs; Mathijssen, Jolanda; Schipper, Maarten; Zeelenberg, Marcel; Polder, J.J.; Prast, Henriëtte

doi:10.1016/j.cct.2016.06.007

Cited by 4 publications

(11 citation statements)

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“…The study design and details on randomization, blinding, eligibility, recruitment and measurement protocols have been published before (Van der Swaluw et al, 2016 ). In brief, we set up a three-arm, parallel group, cluster randomized trial running for 52 weeks with 163 participants in six company gyms (clusters) across the Netherlands.…”

Section: Methodsmentioning

confidence: 99%

“…Specifically, we questioned whether goal attainment differed between the long-term lottery arm, the short-term lottery arm and the control arm between weeks 27 and 52. We hypothesized that goal attainment in the lottery arms would decline between weeks 27 and 52, but still be significantly higher than goal attainment in the control arm and would be highest in the long-term lottery arm (Van der Swaluw et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

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Physical activity after commitment lotteries: examining long-term results in a cluster randomized trial

et al. 2018

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To overcome self-control difficulties, people can commit to their health goals by voluntarily accepting deadlines with consequences. In a commitment lottery, the winners are drawn from all participants, but can only claim their prize if they also attained their gym-attendance goals. In a 52-week, three-arm trial across six company gyms, we tested if commitment lotteries with behavioral economic underpinnings would promote physical activity among overweight adults. In previous work, we presented an effective 26-week intervention. In the present paper we analyzed maintenance of goal attainment at 52-week follow-up and the development of weight over time. We compared weight and goal attainment (gym attendance ≥ 2 per week) between three arms that—in the intervention period- consisted of (I) weekly short-term lotteries for 13 weeks; (II) the same short-term lotteries in combination with an additional long-term lottery after 26 weeks; and (III) a control arm without lottery-deadlines. After a successful 26-week intervention, goal attainment declined between weeks 27 and 52 in the long-term lottery arm, but remained higher than in the control group. Goal attainment did not differ between the short-term lottery arm and control arm. Weight declined slightly in all arms in the first 13 weeks of the trial and remained stable from there on. Commitment lotteries can support regular gym attendance up to 52 weeks, but more research is needed to achieve higher levels of maintenance and weight loss.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical activity after commitment lotteries: examining long-term results in a cluster randomized trial

et al. 2018

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show abstract

“…The study design and details on randomization, blinding, eligibility, recruitment and measurement protocols have been published before (Van der Swaluw et al, 2016). In brief, we set up a three-arm, parallel group, cluster randomized trial running for 52 weeks with 163 participants in six company gyms (clusters) across the Netherlands.…”

Section: Design and Settingmentioning

confidence: 99%

“…Analyses followed the intention-to-treat principle and were conducted in R version 3.4.0 with statistical significance set at p \ 0.05. Planned analyses can also be found in the trial protocol (Van der Swaluw et al, 2016).…”

Section: Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physical Activity after Commitment Lotteries: Examining Long-Term Results in a Cluster Randomized Trial

et al. 2018

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General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.-Users may download and print one copy of any publication from the public portal for the purpose of private study or research -You may not further distribute the material or use it for any profit-making activity or commercial gain -You may freely distribute the URL identifying the publication in the public portal Take down policy If you believe that this document breaches copyright, please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract To overcome self-control difficulties, people can commit to their health goals by voluntarily accepting deadlines with consequences. In a commitment lottery, the winners are drawn from all participants, but can only claim their prize if they also attained their gym-attendance goals. In a 52-week, three-arm trial across six company gyms, we tested if commitment lotteries with behavioral economic underpinnings would promote physical activity among overweight adults. In previous work, we presented an effective 26-week intervention. In the present paper we analyzed maintenance of goal attainment at 52-week follow-up and the development of weight over time. We compared weight and goal attainment (gym attendance C 2 per week) between three arms that-in the intervention period-consisted of (I) weekly short-term lotteries for 13 weeks; (II) the same short-term lotteries in combination with an additional long-term lottery after 26 weeks; and (III) a control arm without lottery-deadlines. After a successful 26-week intervention, goal attainment declined between weeks 27 and 52 in the long-term lottery arm, but remained higher than in the control group. Goal attainment did not differ between the short-term lottery arm and control arm. Weight declined slightly in all arms in the first 13 weeks of the trial and remained stable from there on. Commitment lotteries can support regular gym attendance up to 52 weeks, but more research is needed to achieve higher levels of maintenance and weight loss.

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Commitment Lotteries Promote Physical Activity Among Overweight Adults—A Cluster Randomized Trial

Swaluw

Lambooij

Mathijssen

et al. 2018

Annals of Behavioral Medicine

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Background The World Health Organization has identified physical inactivity as the fourth leading risk factor for global mortality. People often intend to engage in physical activity on a regular basis, but have trouble doing so. To realize their health goals, people can voluntarily accept deadlines with consequences that restrict undesired future behaviors (i.e., commitment devices).Purpose We examined if lottery-based deadlines that leverage regret aversion would help overweight individuals in attaining their goal of attending their gym twice per week. At each deadline a lottery winner was drawn from all participants. The winners were only eligible for their prize if they attained their gym-attendance goals. Importantly, nonattending lottery winners were informed about their forgone prize. The promise of this counterfactual feedback was designed to evoke anticipated regret and emphasize the deadlines.Methods Six corporate gyms with a total of 163 overweight participants were randomized to one of three arms. We compared (i) weekly short-term lotteries for 13 weeks; (ii) the same short-term lotteries in combination with an additional long-term lottery after 26 weeks; and (iii) a control arm without lotteries.Results After 13 weeks, participants in the lottery arms attained their attendance goals more often than participants in the control arm. After 26 weeks, we observe a decline in goal attainment in the short-term lottery arm and the highest goal attainment in the long-term lottery arm. ConclusionsWith novel applications, the current research adds to a growing body of research that demonstrates the effectiveness of commitment devices in closing the gap between health goals and behavior. Clinical Trial informationThis trial is registered in the Dutch Trial Register. Identifier: NTR5559

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Design and protocol of the weight loss lottery- a cluster randomized trial

Cited by 4 publications

References 42 publications

Physical activity after commitment lotteries: examining long-term results in a cluster randomized trial

Physical activity after commitment lotteries: examining long-term results in a cluster randomized trial

Physical Activity after Commitment Lotteries: Examining Long-Term Results in a Cluster Randomized Trial

Commitment Lotteries Promote Physical Activity Among Overweight Adults—A Cluster Randomized Trial

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