DALI: Vitamin D and lifestyle intervention for gestational diabetes mellitus (GDM) prevention: an European multicentre, randomised trial - study protocol

Judith G M Jelsma, Mireille N M van Poppel, Sander Galjaard, Gernot Desoye, Rosa Corcoy, Roland Devlieger, Andre van Assche, Dirk Timmerman, Goele Jans, Jurgen Harreiter, Alexandra Kautzky-Willer, Peter Damm, Elisabeth R Mathiesen, Dorte M Jensen, Liselotte Andersen, Fidelma Dunne, Annunziata Lapolla, Graziano Di Cianni, Alessandra Bertolotto, Ewa Wender-Oegowska, Agnieszka Zawiejska, Kinga Blumska, David Hill, Pablo Rebollo, Frank J Snoek, David Simmons, Judith G M Jelsma, Mireille N M van Poppel, Sander Galjaard, Gernot Desoye, Rosa Corcoy, Roland Devlieger, Andre van Assche, Dirk Timmerman, Goele Jans, Jurgen Harreiter, Alexandra Kautzky-Willer, Peter Damm, Elisabeth R Mathiesen, Dorte M Jensen, Liselotte Andersen, Fidelma Dunne, Annunziata Lapolla, Graziano Di Cianni, Alessandra Bertolotto, Ewa Wender-Oegowska, Agnieszka Zawiejska, Kinga Blumska, David Hill, Pablo Rebollo, Frank J Snoek, David Simmons

Abstract

Background: Gestational diabetes mellitus (GDM) is an increasing problem world-wide. Lifestyle interventions and/or vitamin D supplementation might help prevent GDM in some women.

Methods/design: Pregnant women at risk of GDM (BMI ≥ 29 (kg/m(2))) from 9 European countries will be invited to participate and consent obtained before 19+6 weeks of gestation. After giving informed consent, women without GDM will be included (based on IADPSG criteria: fasting glucose<5.1 mmol; 1 hour glucose <10.0 mmol; 2 hour glucose <8.5 mmol) and randomized to one of the 8 intervention arms using a 2 × (2 × 2) factorial design: (1) healthy eating (HE), 2) physical activity (PA), 3) HE+PA, 4) control, 5) HE+PA+vitamin D, 6) HE+PA+placebo, 7) vitamin D alone, 8) placebo alone), pre-stratified for each site. In total, 880 women will be included with 110 women allocated to each arm. Between entry and 35 weeks of gestation, women allocated to a lifestyle intervention will receive 5 face-to-face, and 4 telephone coaching sessions, based on the principles of motivational interviewing. The lifestyle intervention includes a discussion about the risks of GDM, a weight gain target <5 kg and either 7 healthy eating 'messages' and/or 5 physical activity 'messages' depending on randomization. Fidelity is monitored by the use of a personal digital assistance (PDA) system. Participants randomized to the vitamin D intervention receive either 1600 IU vitamin D or placebo for daily intake until delivery. Data is collected at baseline measurement, at 24-28 weeks, 35-37 weeks of gestation and after delivery. Primary outcome measures are gestational weight gain, fasting glucose and insulin sensitivity, with a range of obstetric secondary outcome measures including birth weight.

Discussion: DALI is a unique Europe-wide randomised controlled trial, which will gain insight into preventive measures against the development of GDM in overweight and obese women.

Trial registration: ISRCTN70595832.

Figures

Figure 1
Figure 1
Trial schedule. * vitamin D arm; PA= Physical Activity; HE= Healthy Eating; Vit D = Vitamin D; GDM= Gestational Diabetes Mellitus; F2F = Face to Face; picture phone = telephone call.

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