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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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Related in: MedlinePlus

Participant flow diagram.
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Fig2: Participant flow diagram.

Mentions: A randomised controlled design will include obese and overweight participants randomly allocated to one of three conditions: A psycho-education control condition (control condition), an implementation intention and mental imagery techniques condition (intervention condition), and an implementation intention and mental imagery techniques with text messages condition (intervention with text message condition). Figure 2 displays the design of the intervention and proposed participant flow through the study. The 12-week study will examine the effects of the intervention on biomedical, psychological, and behavioural outcome measures at baseline and post intervention (at 6 and 12 week follow-ups). The study information and intervention manipulations will be delivered via a video presentation viewed at baseline. See Table 1. While viewing the video intervention manipulations participants will be asked to complete various activities such a goal setting. The responses to the intervention activities will be emailed to the research team to indicate program compliance and adherence. Ethical approval for the trial has been obtained from Curtin University’s Human Research Ethics (approval number: HR137/2013). The trial has been registered on ANZCTR (Trial number: ACTRN12613001274763).Figure 2


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)

Participant flow diagram.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig2: Participant flow diagram.
Mentions: A randomised controlled design will include obese and overweight participants randomly allocated to one of three conditions: A psycho-education control condition (control condition), an implementation intention and mental imagery techniques condition (intervention condition), and an implementation intention and mental imagery techniques with text messages condition (intervention with text message condition). Figure 2 displays the design of the intervention and proposed participant flow through the study. The 12-week study will examine the effects of the intervention on biomedical, psychological, and behavioural outcome measures at baseline and post intervention (at 6 and 12 week follow-ups). The study information and intervention manipulations will be delivered via a video presentation viewed at baseline. See Table 1. While viewing the video intervention manipulations participants will be asked to complete various activities such a goal setting. The responses to the intervention activities will be emailed to the research team to indicate program compliance and adherence. Ethical approval for the trial has been obtained from Curtin University’s Human Research Ethics (approval number: HR137/2013). The trial has been registered on ANZCTR (Trial number: ACTRN12613001274763).Figure 2

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