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Table 2 Systematic process matching behaviour-change technique with theoretical components for the HEALTHI program

From: Weight-loss intervention using implementation intentions and mental imagery: a randomised control trial study protocol

Objective/Behaviour Psychological variable targeted Behaviour change technique (theoretical framework) Implementation strategies Evaluation
1. Diet: Monitor your energy intake and ensure your calorie (or kilojoule) intake amount is somewhere in-between the minimum and maximum allowance amount. Risk perception Information provision. Provide information on obesity related health factors. Questionnaire items measuring Risk perception.
Planning Implementation Intentions Participants create If-then plans on: how they plan to count calories, and how to keep calories to a minimum. Questionnaire items measuring planning and level of If-then plan.
Self-efficacy and motivation Mental Imagery Participants are directed to imagine the steps needed to reach their If-then plan. Questionnaire items to measure self-efficacy and motivation.
   For example, imagining that they want to have a fatty food, and then imagine the steps required to implement their implementation intentions that target this obstacle.  
2. Physical Activity: Engage in physical activity and be as active as possible. Engage in a minimum of 30 minutes of planned daily exercise. Risk perception Information provision Provide information on obesity related health issues and benefit of physical activity. Questionnaire items to measure risk perception.
Planning Implementation Intentions Participants create If-then plans on how they will engage in exercise, and what exercise they will perform. Questionnaire items to measure planning and level of the If-then plan.
Self-efficacy and motivation Mental Imagery Participants are directed to imagine the steps needed to reach their If-then plan. Questionnaire items to measure self-efficacy and motivation.
Information on objectives needed for both Goal 1 (dietary intake) and Goal 2 (physical activity) Evaluation Self-evaluation Self-monitor dietary intake and physical activity involvement. Food, drink, and exercise diary.
Questionnaires to measure dietary and physical activity behaviour.
Body weight measurements.
Outcome expectancies (subjective beliefs about unforseen events of a person’s behaviour with succeeding outcomes. That is, a person’s expectations about the consequences of an action). Information provision. When changing behaviour, the outcomes are viewed as being negative or positive (e.g., weight-loss) and this influences intention to engage in target behaviour (exercise, diet). Questionnaire items to measure outcome expectancy.
Information on positive outcomes of weight-loss and engaging in diet and exercise.
  1. Delivery mode = intervention delivered via online Qualtrics™ with incorporated video presentation.
  2. One condition will receive goal reminder text messages.
  3. Intensity time = participants are asked to view the intervention once and complete the various activities incorporated within the intervention.
  4. Setting = Clinic room within Curtin University.