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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Control | No Intervention | No Intervention: Control Participants exercised on their own without receiving any instructions. | |
| Intervention | Experimental | 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. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Facilitating an Exercise Habit and Identity via the Multi-Process Action Control Model- A Randomized-Controlled Trial | Behavioral | Participants attended a workshop which consisted of a presentation and an exercise planning exercise. |
| 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 |
| 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''. |
| Measure | Description | Time Frame |
|---|---|---|
| Environmental Cues (self report, survey question) | The following item was used to assess if participants implemented the use of cues: "I use cues at home to remind me to exercise (e.g. placing a water bottle on my desk or gym clothes on the bed). The item was rated on a five point Likert scale which ranged from "1=strongly disagree" to "5= strongly agree". | Baseline, week four, week eight |
Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Ryan E Rhodes, PhD | University of Victoria | Study Chair |
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| Baseline, week four, week eight |
| Temporal Consistency (self report, survey question) | The item was worded "How consistently do you exercise at the same time each day? (e.g., exercising every morning at 7 am, or exercising daily after supper)". The question was asked on a five point Likert scale which range from "1=not consistent at all" to "5=very consistent". | Baseline, week four, week eight |