Clinical trial NCT03305172: Structuring Financial Incentives to Increase Physical Activity
Official title: Structuring Financial Incentives to Increase Physical Activity
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Physical Activity
Weight Loss
Lead sponsor: National University of Singapore
Sponsor class: OTHER
Collaborators: name: University of Pennsylvania
First posted: 2017-10-09
Enrollment: 620
Sex: ALL
Minimum age (years): 25
Maximum age (years): 60
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: OTHER

Brief summary: The purpose of this study is to evaluate the effectiveness of different structures of long term financial incentives on increasing physical activity performed by subjects, as measured by the number of steps walked per day.

Investigators are interested in studying whether physical activity increases during an intervention period (with incentives) and a post-intervention period (with no incentives).

Detailed description: The proposed study is a field experiment. Adults within the ages of 25 and 60 years of age, and with a body mass index of 22 or higher will be eligible to participate.

The study will consist of (1) a two-week baseline period, (2) a 36-week intervention period, and (3) a 12-week follow-up period.

At the beginning of the study, subjects will be given a wearable fitness device and their daily step count will be monitored for two weeks; this is the baseline period. After the two-week baseline period, the subjects will be randomly assigned to one of the five different conditions (Control, Gain, Loss, Gain Streak, or Loss Streak) and will be given the goal to increase their baseline step counts by 2,500 steps.

=====

HYPOTHESES -- Investigators expect the following:

1. Loss Aversion: Subjects in the Loss treatment will achieve the goal on a greater number of days than subjects in the Gain treatment.
2. Streak: Subjects in the Gain treatment will achieve the goal on a greater number of days than subjects in the Gain Streak treatment.
3. Loss Streak: Subjects in the Loss treatment will achieve the goal on a greater number of days than subjects in the Loss Streak treatment. Whether subjects in the Loss Streak treatment will perform better or worse than subjects in the other two treatments will be investigated.

CONTRIBUTION -- Prior research has not examined the effect of a long term financial incentive (36 weeks) on individual behavior in achieving a goal. In this study, the investigators also examine two additional financial incentive structures: Gain Streak and Loss Streak. If the hypotheses are correct, the results have important implications for designing financial incentives to encourage good behavior and to encourage good habit formation across domains.

Eligibility criteria: Inclusion Criteria:

* Singapore citizens and permanent residents
* Adults with BMI greater than 22
* Ownership of a smartphone or tablet
* Only one member per household can participate in the study

Exclusion Criteria:

* Women who are pregnant or breast feeding, or who intend to become pregnant over next year
* Subjects who are already participating in another physical activity program or study
* Subjects who are unable to participate for a total of 1 year
* Subjects who are unwilling to wear the fitness device
* Subjects who already walk more than 10,000 steps a day (self-reported per-day-average over seven days)
* Subjects who have any of the following health conditions:

  * high blood pressure
  * high cholesterol
  * heart attack
  * heart failure
  * stroke
  * chronic obstructive pulmonary disease
  * kidney disease
  * diabetes (type 2)

Primary outcomes:
measure: Step count goal -- Intervention
timeFrame: 36-week intervention period following the baseline period.
measure: Change in mean daily steps -- Intervention
timeFrame: 36-week intervention period following the baseline period.
Secondary outcomes:
measure: Step count goal -- Post-intervention
timeFrame: 12-week post-intervention period.
measure: Change in mean daily steps -- Post-intervention
timeFrame: 12-week post-intervention period.
measure: Sleep Pattern -- Intervention
timeFrame: 36-week intervention period following the baseline period.
measure: Sleep Pattern -- Post-intervention
timeFrame: 12-week post-intervention period.
measure: Weight (in kilograms) Loss -- Intervention
timeFrame: 36-week intervention period following the baseline period.
measure: Weight (in kilograms) Loss -- Post-intervention
timeFrame: 48-week period following the baseline period.
measure: Change in Waist Measurement (in inches) -- Intervention
timeFrame: 36-week intervention period following the baseline period
measure: Change in Waist Measurement (in inches) -- Post-intervention
timeFrame: 48-week period following the baseline period.
Other outcomes:
Locations:
city: Singapore
country: Singapore
facility: National University of Singapore
Study officials:
affiliation: National University of Singapore
name: Teck H Ho, PhD
role: PRINCIPAL_INVESTIGATOR
References: