Understanding Mechanisms of Health Behavior
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Enrollment
- 61
- Primary Endpoint
- Fruit and Vegetable Consumption, servings per week
Study Overview
Brief Summary
This research seeks to examine psychological factors that may impact relationship between incentives and health behavior engagement, specifically fruit and vegetable consumption. Additionally, it will compare the impact of two different incentive schedules on behavior engagement, one providing immediate rewards (i.e. rewards received on a daily basis) and another providing delayed rewards (i.e. rewards received at the end of the study period), with a control condition in which no rewards are offered. Study participants will provide reports of their fruit and vegetable consumption each day for three weeks, and in the two incentive conditions, they will receive small monetary rewards for their fruit and vegetable consumption. Following the three week reporting and reward period, participants will complete two additional assessments, measuring psychological constructs and behavior engagement following the cessation of rewards.
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Parallel
- Primary Purpose
- Basic Science
- Masking
- None
Eligibility Criteria
- Ages
- 18 Years to — (Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •Consume fewer than 5 servings/day of fruits and vegetables
- •Daily access to internet for 3 weeks following baseline session
- •Have or are willing to create an account on PayPal
Exclusion Criteria
- Not provided
Arms & Interventions
Control
Daily reporting of fruit and vegetable consumption
Intervention: Self monitoring (Behavioral)
Daily reward
Incentives for fruit and vegetable consumption delivered daily
Intervention: Self monitoring (Behavioral)
Daily reward
Incentives for fruit and vegetable consumption delivered daily
Intervention: Monetary incentives (Behavioral)
Delayed reward
Incentives for fruit and vegetable consumption delivered in a lump sum at the end of the intervention
Intervention: Monetary incentives (Behavioral)
Delayed reward
Incentives for fruit and vegetable consumption delivered in a lump sum at the end of the intervention
Intervention: Self monitoring (Behavioral)
Outcomes
Primary Outcomes
Fruit and Vegetable Consumption, servings per week
Time Frame: 3 weeks
Attitudes scale score
Time Frame: 5 weeks
Intrinsic Motivation scale score
Time Frame: 5 weeks
Fruit and vegetable consumption, servings per week
Time Frame: 5 weeks
Perceived Behavioral Control scale score
Time Frame: 5 weeks
Perceived Behavioral Control scale score
Time Frame: 3 weeks
Attitudes scale score
Time Frame: 3 weeks
Intrinsic Motivation scale score
Time Frame: 3 weeks
Secondary Outcomes
- Perceived Stress Scale score(5 weeks)
- Perceived Stress Scale score(3 weeks)
Investigators
Angela Bryan
PI
University of Colorado, Boulder