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

Hattar A, Hagger MS, Pal S - BMC Public Health (2015)

Bottom Line: The effectiveness of goal-reminder text messages to augment intervention effects will also be tested.We hypothesise that the intervention conditions will lead to statistically-significant changes in the primary and secondary outcome variables measured at 6 and 12 weeks post-intervention relative to the psycho-education control condition after controlling for baseline values.We also expect the intervention condition augmented with text messages to lead to statistically significant differences in the primary and secondary outcome variables at the follow up periods after controlling for baseline values.

View Article: PubMed Central - PubMed

Affiliation: Health Psychology and Behavioural Medicine Research Group, School of Psychology and Speech Pathology, Faculty of Health Sciences, Curtin University, GPO Box U1987, Perth, 6845, Western Australia, Australia. annehattar@postgrad.curtin.edu.au.

ABSTRACT

Background: Overweight and obesity are major health problems worldwide. This protocol describes the HEALTHI (Healthy Eating and Active LifesTyle Health Intervention) Program, a 12-week randomised-controlled weight-loss intervention that adopts two theory-based intervention techniques, mental imagery and implementation intentions, a behaviour-change technique based on planning that have been shown to be effective in promoting health-behaviour change in previous research. The effectiveness of goal-reminder text messages to augment intervention effects will also be tested. The trial will determine the effects of a brief, low cost, theory-based weight-loss intervention to improve dietary intake and physical activity behaviour and facilitate weight-loss in overweight and obese individuals.

Methods/design: Overweight or obese participants will be randomly allocated to one of three conditions: (1) a psycho-education plus an implementation intentions and mental imagery condition; (2) a psycho-education plus an implementation intentions and mental imagery condition with text messages; or (3) a psycho-education control condition. The intervention will be delivered via video presentation to increase the intervention's applicability in multiple contexts and keep costs low. We hypothesise that the intervention conditions will lead to statistically-significant changes in the primary and secondary outcome variables measured at 6 and 12 weeks post-intervention relative to the psycho-education control condition after controlling for baseline values. The primary outcome variable will be body weight and secondary outcome variables will be biomedical (body mass, body fat percentage, muscle mass, waist-hip circumference ratio, systolic and diastolic blood pressure, low-density lipoprotein, high-density lipoprotein, total cholesterol, triglycerides, blood glucose and insulin levels), psychological (quality of life, motivation, risk perception, outcome expectancy, intention, action self-efficacy, maintenance self-efficacy, goal setting and planning), and behavioural (self-reported diet intake, and physical activity involvement) measures. We also expect the intervention condition augmented with text messages to lead to statistically significant differences in the primary and secondary outcome variables at the follow up periods after controlling for baseline values.

Discussion: The planned trial will test the effectiveness of the theory-based HEALTHI program intervention to reduce weight and salient psychological, biomedical, and behavioural outcomes in overweight and obese adults. The study has been designed to maximise applicability to real world settings and could be integrated into existing weight management practices.

Trial registration: ACTRN: ACTRN12613001274763. Registration date 19/11/2013.

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Health action process approach model (Schwarzer, 2008).
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Fig1: Health action process approach model (Schwarzer, 2008).

Mentions: The current intervention adopts the HAPA [5], an integrated social psychological model that has been widely used to identify the components related to changes in weight loss behaviours and how components can be used to inform the intervention content to ensure the change process is clearly identified (see FigureĀ 1). The HAPA states that the process of health behaviour change consists of two phases: a motivational phase that leads an individual to form the intention to change their behaviour, and a volitional phase that leads the individual to performing the actual behaviour [5]. Two strategies that map closely on to the volitional and motivational phases of the HAPA include implementation intentions and mental imagery, respectively. The intervention components are designed to target both the motivational and implemental phases of the HAPA. The components are proposed to lead to optimal behaviour change by providing individuals with the confidence and motivation to engage in the behaviour, as well as the capacity to convert motivation into actual behaviour change [20].Figure 1


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

Hattar A, Hagger MS, Pal S - BMC Public Health (2015)

Health action process approach model (Schwarzer, 2008).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4363065&req=5

Fig1: Health action process approach model (Schwarzer, 2008).
Mentions: The current intervention adopts the HAPA [5], an integrated social psychological model that has been widely used to identify the components related to changes in weight loss behaviours and how components can be used to inform the intervention content to ensure the change process is clearly identified (see FigureĀ 1). The HAPA states that the process of health behaviour change consists of two phases: a motivational phase that leads an individual to form the intention to change their behaviour, and a volitional phase that leads the individual to performing the actual behaviour [5]. Two strategies that map closely on to the volitional and motivational phases of the HAPA include implementation intentions and mental imagery, respectively. The intervention components are designed to target both the motivational and implemental phases of the HAPA. The components are proposed to lead to optimal behaviour change by providing individuals with the confidence and motivation to engage in the behaviour, as well as the capacity to convert motivation into actual behaviour change [20].Figure 1

Bottom Line: The effectiveness of goal-reminder text messages to augment intervention effects will also be tested.We hypothesise that the intervention conditions will lead to statistically-significant changes in the primary and secondary outcome variables measured at 6 and 12 weeks post-intervention relative to the psycho-education control condition after controlling for baseline values.We also expect the intervention condition augmented with text messages to lead to statistically significant differences in the primary and secondary outcome variables at the follow up periods after controlling for baseline values.

View Article: PubMed Central - PubMed

Affiliation: Health Psychology and Behavioural Medicine Research Group, School of Psychology and Speech Pathology, Faculty of Health Sciences, Curtin University, GPO Box U1987, Perth, 6845, Western Australia, Australia. annehattar@postgrad.curtin.edu.au.

ABSTRACT

Background: Overweight and obesity are major health problems worldwide. This protocol describes the HEALTHI (Healthy Eating and Active LifesTyle Health Intervention) Program, a 12-week randomised-controlled weight-loss intervention that adopts two theory-based intervention techniques, mental imagery and implementation intentions, a behaviour-change technique based on planning that have been shown to be effective in promoting health-behaviour change in previous research. The effectiveness of goal-reminder text messages to augment intervention effects will also be tested. The trial will determine the effects of a brief, low cost, theory-based weight-loss intervention to improve dietary intake and physical activity behaviour and facilitate weight-loss in overweight and obese individuals.

Methods/design: Overweight or obese participants will be randomly allocated to one of three conditions: (1) a psycho-education plus an implementation intentions and mental imagery condition; (2) a psycho-education plus an implementation intentions and mental imagery condition with text messages; or (3) a psycho-education control condition. The intervention will be delivered via video presentation to increase the intervention's applicability in multiple contexts and keep costs low. We hypothesise that the intervention conditions will lead to statistically-significant changes in the primary and secondary outcome variables measured at 6 and 12 weeks post-intervention relative to the psycho-education control condition after controlling for baseline values. The primary outcome variable will be body weight and secondary outcome variables will be biomedical (body mass, body fat percentage, muscle mass, waist-hip circumference ratio, systolic and diastolic blood pressure, low-density lipoprotein, high-density lipoprotein, total cholesterol, triglycerides, blood glucose and insulin levels), psychological (quality of life, motivation, risk perception, outcome expectancy, intention, action self-efficacy, maintenance self-efficacy, goal setting and planning), and behavioural (self-reported diet intake, and physical activity involvement) measures. We also expect the intervention condition augmented with text messages to lead to statistically significant differences in the primary and secondary outcome variables at the follow up periods after controlling for baseline values.

Discussion: The planned trial will test the effectiveness of the theory-based HEALTHI program intervention to reduce weight and salient psychological, biomedical, and behavioural outcomes in overweight and obese adults. The study has been designed to maximise applicability to real world settings and could be integrated into existing weight management practices.

Trial registration: ACTRN: ACTRN12613001274763. Registration date 19/11/2013.

Show MeSH
Related in: MedlinePlus