Multifactorial intervention for children with asthma and overweight (Mikado): study design of a randomised controlled trial

Maartje Willeboordse, Kim D G van de Kant, Maroeska N de Laat, Onno C P van Schayck, Sandra Mulkens, Edward Dompeling, Maartje Willeboordse, Kim D G van de Kant, Maroeska N de Laat, Onno C P van Schayck, Sandra Mulkens, Edward Dompeling

Abstract

Background: In children, the prevalence's of both obesity and asthma are disconcertingly high. Asthmatic children with obesity are characterised by less asthma control and a high need for asthma medication. As the obese asthmatic child is becoming more common in the clinical setting and the disease burden of the asthma-obesity phenotype is high, there is an increasing need for effective treatment in these children. In adults, weight reduction resulted in improved lung function, better asthma control and less need for asthma medication. In children this is hardly studied. The Mikado study aims to evaluate the effectiveness of a long term multifactorial weight reduction intervention, on asthma characteristics in children with asthma and a high body weight.

Methods/design: The Mikado study is a two-armed, randomised controlled trial. In total, 104 participants will be recruited via online questionnaires, pulmonary paediatricians, the youth department of the Municipal Health Services and cohorts of existing studies. All participants will be aged 6-16 years, will have current asthma, a Body Mass Index in the overweight or obesity range, and no serious comorbidities (such as diabetes, heart diseases). Participants in the intervention arm will receive a multifactorial intervention of 18 months consisting of sessions concerning sports, parental involvement, individual counselling and lifestyle advices including dietary advices and cognitive behavioural therapy. The control group will receive usual care. The primary outcome variables will include Forced Expiratory Volume in one second and Body Mass Index - Standard Deviation Score. Secondary outcomes will include other lung function parameters (including dynamic and static lung function parameters), asthma control, asthma-specific quality of life, use of asthma medication and markers of systemic inflammation and airway inflammation.

Discussion: In this randomised controlled trial we will study the potential of a multifactorial weight reduction intervention to improve asthma-related outcome measures in asthmatic children with overweight. Moreover, it will provide information about the underlying mechanisms in the relationship between asthma and a high body weight in children. These findings can contribute to optimal management programs and better clinical guidelines for children with asthma and overweight.

Trial registration: Clinicaltrial.gov NCT00998413.

Figures

Figure 1
Figure 1
Flow diagram study design. Abbreviations: BHR = Bronchial Hyper-Responsiveness, BMI = Body Mass index, EBC = Exhaled Breath Condensate, FeNO = Fractional exhaled Nitric Oxide, VO2max = Maximal Oxygen Uptake.

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