Multiphase Optimization Trial of Incentives for Veterans to Encourage Walking

Regular physical activity (PA) is essential to healthy aging. Unfortunately, only 5% of US adults meet guideline of 150 minutes of moderate exercise; Veterans and non-Veterans have similar levels of PA. A patient incentive program for PA may help. Behavioral economics suggests that the chronic inability to start and maintain a PA routine may be the result of "present bias," which is a tendency to value immediate rewards over rewards in the future. With present bias, it is always better to exercise tomorrow because the immediate gratification of watching television or surfing the internet is a more powerful motivator than the intangible and delayed benefit of future health. Patient incentives may overcome present bias by moving the rewards for exercise forward in time.

Recent randomized trials suggest that incentives for PA can be effective, but substantial gaps in knowledge prevent the implementation of a PA incentive program in Veterans Affairs (VA). First, incentive designs vary considerably. They vary by the size of the incentive, the type of incentive (cash or non-financial), the probability of earning an incentive (an assured payment for effort or a lottery-based incentive), or whether the incentive is earned after the effort is given (a gain-framed incentive) or awarded up-front and lost if the effort is not given (a loss-framed incentive). The optimal combination of these components for a Veteran population is unknown. Second, the evidence about the effective components of incentives comes from studies conducted in populations that were overwhelmingly female; often employees at large companies, with high levels of education and income. VA users, in contrast, are mostly male and lower income, and most are not employed. This is important because the investigators have theoretical reasons to believe that the effects of components of incentives are likely to vary by income and gender. Finally, few studies have managed to design an incentive such that the physical activity was maintained after the incentive was removed. Indeed, a common theme in incentivizing health behavior change is the difficulty in sustaining behavior change once the incentives are removed.

Study Overview

• Status: Completed
• Conditions: Depression; Hypertension; Exercise; Sedentary Behavior; Motivation; Walking; Body Mass Index
• Intervention / Treatment: Behavioral: Walking

Detailed Description

The investigators propose to fill the research gaps through a Multiphase Optimization Strategy (MOST) trial of incentives for walking. A MOST trial is ideally suited for situations in which a proposed intervention has many potential intervention components. A MOST trial consists of three phases. A screening phase trial is used to efficiently identify-through a factorial designed randomized trial-the effective components of a complex intervention like incentives. A refining phase trial tests the optimal dose (size or duration) of the incentives. A confirmatory phase trial tests the optimal components and dose against a usual care control. The goal of the proposed study is to conduct the screening phase trial in 128 Veterans to identify the optimal components of incentives for increasing walking among physically inactive Veterans. All Veterans in this phase will be given various components of incentives for increasing average steps per day to 7,000 steps over a 12-week habit-building period, and then maintaining the increase through a 12-week habit maintenance period. The specific aims are:

Aim 1: Conduct a 24 factorial designed screening-phase trial of incentives for increasing average steps per day to 7,000 steps over 12 weeks among physically inactive Veterans. Every patient in the trial will be given a Fitbit Inspire activity monitor and assigned to a group that receives different components of incentives. The investigators will test four different incentive factors: 1) lottery vs. loss framed incentives, 2) financial vs. non-financial incentives, 3) a pre-commitment postcard reminder of a Veteran's stated intrinsic reason for commitment to PA vs. no pre-commitment postcard, and 4) a request for PA advice from a Veteran on staying active vs. no request. The first factor has never been tested in a population like the VA. Factors 2-4 are designed specifically to sustain the effects of incentives after the incentive is removed. Factor 4 is a novel hypothesis that has never been tested outside of educational research: specifically, that asking for advice from a Veteran is more motivating than giving advice to them, even if that Veteran is struggling with low physical activity themselves. The primary outcome is change in steps per week from baseline to week 24.

Aim 2. Conduct cost analyses and qualitative interviews. The cost of administering each component and qualitative assessments of the acceptability of each component to trial participants will inform the decision of which components to retain for the subsequent refining and confirmatory phase trials.

Aim 3. Convene an expert panel to choose components for the next phases of the MOST trial. The panel will weigh each component in terms of its effect on step counts (Aim 1), administrative costs and participant-reported qualitative assessments (Aim 2), and the strength of the theoretical basis for the component's effect on physical activity.

• Study Type: Interventional
• Enrollment (Actual): 102
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Washington
    • Seattle, Washington, United States, 98108-1532
      • VA Puget Sound Health Care System Seattle Division, Seattle, WA

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 50 years to 69 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Veteran that receives healthcare at VA Puget Sound Health Care System
• Age 50-69
• Diagnosis of hypertension, depression or a BMI between 25-40.
• Physically inactive according to self-report. .
• 2,000-5,000 steps per day during the screening week
• Have and be able to use a smart phone.

Exclusion Criteria:

• MOVE participation in the past 4 months
• Blind
• <2,000 steps per day
• Inability to walk 20 minutes without stopping (self-report).
• Eating disorder.
• Dementia/ cognitive impairment
• Metastatic cancer, end state renal disease, hospice, palliative care, heart failure, undergoing chemotherapy, radiation or hemodialysis, have had or are on the list for an organ transplant.
• Implanted cardiovascular device such as defibrillator or ventricular device
• Active psychosis/mania/behavioral flag
• Pregnant women
• Homeless or housing insecure
• Has a paid caregiver that provides >50% of daily living activities, lives in a nursing home, assisted living facility or group home.
• Individuals that exhibit threatening, violent or inappropriate behavior during the screening phone call.
• Foot Ulcer

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Health Services Research
• Allocation: Randomized
• Interventional Model: Factorial Assignment
• Masking: Single

Number of Arms

16

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: F1M1P1R1; Financial Reward, mixed lottery, pre-commitment postcard reminders, request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: N1M1P1R1; Non-financial reward, mixed lottery, pre-commitment postcard reminders, request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: N1M1P1R0; Non-financial reward, mixed lottery, pre-commitment postcard reminders, no request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: N1M1P0R0; Non-financial reward, mixed lottery, no pre-commitment postcard reminders, no request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: N1M1P0R1; Non-financial reward, mixed lottery, no pre-commitment postcard reminders, request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: N1L1P1R1; Non-financial reward, loss incentive, pre-commitment postcard reminders, request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: N1L1P1R0; Non-financial reward, loss incentive, pre-commitment postcard reminders, no request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: N1L1P0R0; Non-financial reward, loss incentive, no pre-commitment postcard reminders, no request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: N1L1P0R1; Non-financial reward, loss incentive, no pre-commitment postcard reminders, request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: F1M1P1R0; Financial Reward, mixed lottery, pre-commitment postcard reminders, no request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: F1M1P0R0; Financial Reward, mixed lottery, no pre-commitment postcard reminders, no request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: F1M1P0R1; Financial Reward, mixed lottery, no pre-commitment postcard reminders, request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: F1L1P1R1; Financial Reward, loss incentive, pre-commitment postcard reminders, request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: F1L1P1R0; Financial Reward, loss incentive, pre-commitment postcard reminders, no request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: F1L1P0R0; Financial Reward, loss incentive, no pre-commitment postcard reminders, no request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.
Experimental: F1L1P0R1; Financial Reward, loss incentive, no pre-commitment postcard reminders, request physical activity advice	Behavioral: Walking; Inactive Veterans will be encouraged to increase their step count to 7,000 steps per day by the end of the 12-week intervention period. Weekly the step goal will increase 15% if they were successful in reaching their goal the previous week.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in Average Steps Per Day From Baseline Week to Week 12	The change in average steps per day from the baseline week to week 12.	baseline to week 12
Change in Average Steps Per Day From Baseline Week to Week 24	The change in average steps per day from the baseline week to week 24	baseline to week 24

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Self-efficacy	Measured using the Exercise Self-Efficacy Scale at baseline, week 12 and week 24 (McAuley E 1993). This scale measures self-efficacy on nine different measures from not confident (0 rating) to very confident (10 rating).The range is 0 to 10. A higher rating indicates that the respondent is more confident they will be able to overcome barriers to physical activity.	Measured at baseline, week 12 and 24
Intrinsic/Extrinsic Motivation	Measured using the Motivation for Physical Activity Measurement (MPAM) at baseline, week 12 and week 24 (Frederick CM 1993). This scale measures reasons and motivations for participating in physical activity having respondents indicate why they exercise. The scale ranges from 1=very true for me, 2= somewhat true for me, 3=neither true nor untrue for me, 4=somewhat untrue for me, 5= very untrue for me. The minimum score is 1 and the maximum is 5. Higher scores means more intrinsic motivation to exercise.	Measured at baseline, week 12 and 24
Mental Health	Measured using the PHQ-8 depression scale at baseline, week 12 and week 24. This assessment measures depressive symptoms over the past 2 weeks. Respondents indicate how bothered they were by the following problems on a scale from 0 (not at all) to 3 (nearly every day). The minimum and maximum score are zero and 24, respectively. A lower score indicates fewer depressive symptoms.	Measured at baseline, week 12 and 24

Collaborators and Investigators

• Sponsor: VA Office of Research and Development
• Investigators: Principal Investigator: Paul L. Hebert, PhD BA, VA Puget Sound Health Care System Seattle Division, Seattle, WA

Study record dates

Study Major Dates

• Study Start (Actual): March 17, 2022
• Primary Completion (Actual): November 30, 2023
• Study Completion (Actual): July 31, 2024

Study Registration Dates

• First Submitted: August 14, 2020
• First Submitted That Met QC Criteria: August 14, 2020
• First Posted (Actual): August 19, 2020

Study Record Updates

• Last Update Posted (Actual): April 30, 2025
• Last Update Submitted That Met QC Criteria: April 10, 2025
• Last Verified: April 1, 2025

More Information

Terms related to this study

• Keywords: walking; sedentary behavior; motivation
• Additional Relevant MeSH Terms: Vascular Diseases; Cardiovascular Diseases; Behavioral Symptoms; Hypertension; Depression
• Other Study ID Numbers: IIR 19-450

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No