Exercise Habit & MPAC

Study Overview
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Brief Summary
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The limitations of applying social cognitive models to understand physical activity (PA) have led to the emergence of several new PA models within the past decade. The Multi-Process Action Control (M-PAC) is a comprehensive PA model that proposes intention is established from outcome expectations, perceived capability, and opportunity, then the success of translating this to behavior depends on affective judgments and behavioral-regulation. Over time, M-PAC proposes that behavior is can become maintained through the formation of identity and habit. The purpose of this study was to investigate the trajectory of change of these M-PAC constructs across time in a randomized controlled trial. Participants (n=85) were inactive new gym members and were randomized into a control (n=41) or intervention (n=44) group. The intervention group attended a workshop and received a booster phone call follow-up at week four. Measures for both groups included accelerometry and M-PAC at baseline and eight week follow-up.

Official Title
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Facilitating an Exercise Habit and Identity Via the Multi-Process Action Control Model- A Randomized-Controlled Trial

Conditions
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Public Health

Intervention / Treatment
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* Behavioral: Facilitating an Exercise Habit and Identity via the Multi-Process Action Control Model- A Randomized-Controlled Trial


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: adults 18-65 new gym members exercising < 150 minutes/week at a moderate to vigorous level Exclusion Criteria: not affiliated with a gym or recreation center exercising > 150 minutes/week at a moderate to vigorous level clinical health conditions (assessed by the PAR-Q)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| No Intervention: Control<br>No Intervention: Control Participants exercised on their own without receiving any instructions. | |
| Experimental: Intervention<br>Those who were randomized into the intervention group attended a workshop where the PI delivered a presentation that focused on establishing a preparatory exercise habit by using the M-PAC approach and proposed habit model. Participants were then provided with instructions on completing their exercise plan sheet. | Behavioral: Facilitating an Exercise Habit and Identity via the Multi-Process Action Control Model- A Randomized-Controlled Trial<br>* Participants attended a workshop which consisted of a presentation and an exercise planning exercise.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| GT3X+ Actigraph Activity Monitors (for measuring physical activity) | Participants wear accelerometers for one week at baseline and at week eight to record their physical activity. | Baseline to 8 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| 1.Self-Report Behavioural Automaticity Index (self report, survey question | The Self-Report Behavioral Automaticity Index (SRBAI) was used to assess preparatory habit. The SRBAI consists of 4 items on a 5-point Likert scale with 1 being strongly disagree to 5 being strongly agree. The question stem stated ''When I prepare to exercise…'' which was then followed by four items on the scale: ''I do it without having to consciously remember'', ''I do it automatically'', ''I do it without thinking'', and ''I start before I realize I am doing it''. | Baseline, week four, week eight |