Accepted for/Published in: JMIR Research Protocols
Date Submitted: Apr 25, 2019
Date Accepted: Sep 7, 2019
Development of a personalised web-based diet and physical activity intervention based on motivational interviewing and self-determination theory: Study Protocol of MyLifestyleCoach
ABSTRACT
Background:
Unhealthy dietary patterns and insufficient physical activity (PA) are associated with negative health outcomes, such as cardiovascular diseases, type 2 diabetes, cancer, and overweight/obesity. This makes the promotion of healthy dietary and PA behaviours a public health priority.
Objective:
This paper describes the development, design and evaluation protocol of a web-based computer-tailored (CT) dietary and PA promotion intervention “MyLifestyleCoach”. A web-based format is chosen for its accessibility and large-scale reach and low-cost potential. To achieve effective and persistent behavioural change, this innovative intervention is tailored to individual characteristics and is based on self-determination theory (SDT) and motivational interviewing (MI).
Methods:
The six steps of the Intervention Mapping (IM) protocol were used to systematically develop MyLifestyleCoach based on the existing effective computer-tailored PA promotion intervention I Move.
Results:
The MyLifestyleCoach intervention consists of two modules: I Move, which is aimed at promoting PA, and I Eat, which is aimed at promoting healthy eating. Development of the I Eat module was informed by the previously developed I Move. Both modules were integrated to form the comprehensive MyLifestyleCoach programme. Furthermore, I Move was slightly adapted, e.g. the new Dutch PA guidelines were implemented. A randomised controlled trial (RCT) consisting of an intervention condition and waiting list control group will be used to evaluate the effectiveness of the intervention on diet and PA. Self-report measures take place at baseline, 6 months and 12 months after baseline.
Conclusions:
MyLifestyleCoach is one of the first interventions to translate and apply SDT and techniques from MI in online CT for an intervention targeting PA and dietary behaviour. Intervention Mapping served as a blueprint for the development of this intervention. We will evaluate whether this approach is also successful in promoting eating healthier and increasing PA using an RCT, by comparing the intervention to a waiting list control condition. The results will provide insight into the short- and long-term efficacy and will result in recommendations for the implementation and promotion of healthy eating and PA among adults in the Netherlands. Clinical Trial: The study is registered in the Dutch Trial Register (NTR7549) on October, 10, 2018.
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