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Trial registered on ANZCTR


Registration number
ACTRN12620000387921
Ethics application status
Approved
Date submitted
9/03/2020
Date registered
20/03/2020
Date last updated
30/06/2024
Date data sharing statement initially provided
20/03/2020
Type of registration
Prospectively registered

Titles & IDs
Public title
Should an evening snack be recommended in the management of gestational diabetes mellitus?
Scientific title
Bedtime snacks for gestational diabetes mellitus (GDM): Should an evening snack be recommended in the management of GDM?
Secondary ID [1] 300695 0
Nil known
Universal Trial Number (UTN)
U1111-1249-0970
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Gestational Diabetes Mellitus 316508 0
Condition category
Condition code
Metabolic and Endocrine 314752 314752 0 0
Diabetes
Reproductive Health and Childbirth 314901 314901 0 0
Fetal medicine and complications of pregnancy

Intervention/exposure
Study type
Interventional
Description of intervention(s) / exposure
ARM 1: a snack (i.e. greek yoghurt) consumed 30 minutes before bedtime every night for 6 weeks. The snack consists of 1 CHO exchange (15g of carbohydrate or ~60 calories of carbohydrate). The total calories of the snack is ~180 calories. Total carbohydrate exchange distribution throughout the day of 2,2,2,2,3,1 for breakfast, morning tea, lunch, afternoon tea, dinner and supper respectively.
ARM 2: a snack (i.e. flavoured yoghurt) consumed 30 minutes before bedtime every night for 6 weeks. The snack consists of 2 CHO exchange (30g of carbohydrate or ~120 calories of carbohydrate). The total calories of the snack is ~180 calories. Total carbohydrate exchange distribution throughout the day of 2,2,2,2,2,2 for breakfast, morning tea, lunch, afternoon tea, dinner and supper respectively.
The intervention will be delivered by a dietitian, via teleconference if required. Both groups will receive standard care which is the advice to consume 12 CHO exchanges per day, however the distribution of exchanges will vary depending on the treatment group.
Consumption of the bedtime snack will be recorded by participants using a check sheet.
Intervention code [1] 317020 0
Treatment: Other
Comparator / control treatment
The control group will not be advised to have a snack before bedtime. The control group will receive standard care which is the advice to consume 12 carbohydrate exchanges per day (as will arm 1 and arm 2). The 12 carbohydrate exchanges will be distributed as 2,2,3,2,3,0 for breakfast, morning tea, lunch, afternoon tea, dinner and supper respectively.
Control group
Active

Outcomes
Primary outcome [1] 323128 0
Change in fasting glucose determined by finger prick blood glucose monitor.
Timepoint [1] 323128 0
Daily throughout intervention including baseline and 6 weeks after intervention commencement.
Primary outcome [2] 323130 0
Change in the proportion of women prescribed insulin.
Timepoint [2] 323130 0
Baseline and 6 weeks after intervention commencement.
Primary outcome [3] 323279 0
Change in the dose of insulin prescribed to the participating women.
Timepoint [3] 323279 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [1] 380871 0
Change in postprandial breakfast glucose levels determined by a finger prick blood glucose monitor.
Timepoint [1] 380871 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [2] 380872 0
Change in total cholesterol determined by a plasma assay.
Timepoint [2] 380872 0
Baseline and 6 weeks after intervention commencement,
Secondary outcome [3] 380873 0
Change in triglycerides determined by a plasma assay.
Timepoint [3] 380873 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [4] 380874 0
Change in appetite determined by 100mm visual analogue scale.
Timepoint [4] 380874 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [5] 380875 0
Change in LDL-cholesterol determined by plasma assay.
Timepoint [5] 380875 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [6] 380876 0
Change in sleep behaviour determined by ActiGraph (advanced sleep features) accelerometer.
Timepoint [6] 380876 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [7] 380877 0
Change in body composition determined by bioelectrical impedance analysis.
Timepoint [7] 380877 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [8] 380880 0
Change in insulin levels determined by plasma assay.
Timepoint [8] 380880 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [9] 380882 0
Change in glucagon levels determined by plasma assay.
Timepoint [9] 380882 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [10] 380884 0
Change in leptin levels determined by plasma assay.
Timepoint [10] 380884 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [11] 380886 0
Change in ghrelin levels determined by plasma assay.
Timepoint [11] 380886 0
Baseline and 6 weeks after intervention commencement.
Secondary outcome [12] 380890 0
Gestational age of birth determined by hospital health records.
Timepoint [12] 380890 0
Assessed during hospital stay after birth (~48hr after birth)
Secondary outcome [13] 380891 0
Gender of baby, determined by hospital health records.
Timepoint [13] 380891 0
Assessed during hospital stay after birth (~48hr after birth)
Secondary outcome [14] 380892 0
Birth weight determined by hospital health records.
Timepoint [14] 380892 0
Assessed during hospital stay after birth (~48hr after birth)
Secondary outcome [15] 380893 0
Birth length determined by hospital health records.
Timepoint [15] 380893 0
Assessed during hospital stay after birth (~48hr after birth)
Secondary outcome [16] 380894 0
Method of delivery of the birth determined by hospital health records.
Timepoint [16] 380894 0
Assessed during hospital stay after birth (~48hr after birth)
Secondary outcome [17] 380895 0
Number of visits with dietitian determined by hospital health records.
Timepoint [17] 380895 0
Assessed during hospital stay after birth (~48hr after birth)
Secondary outcome [18] 381210 0
Number of visits with obstetrician determined by hospital health records.
Timepoint [18] 381210 0
Assessed during hospital stay after birth (~48hr after birth)
Secondary outcome [19] 381414 0
Change in fasting glucose determined by continuous glucose monitoring.
Timepoint [19] 381414 0
Baseline and 6 weeks after intervention commencement
Secondary outcome [20] 381415 0
Change in overnight glucose determined by continuous glucose monitoring.
Timepoint [20] 381415 0
Baseline and 6 weeks after intervention commencement.

Eligibility
Key inclusion criteria
Diagnosed with GDM (physician, antenatal clinic or blood test).
Singleton pregnancy.
Able to start intervention between 28-<32 weeks gestation.
Minimum age
18 Years
Maximum age
No limit
Sex
Females
Can healthy volunteers participate?
No
Key exclusion criteria
Allergies or intolerance to components in dairy (i.e. lactose).
High-risk pregnancy (i.e. twins, drug or alcohol abuse, chronic health problems, or pregnancy complications).

Study design
Purpose of the study
Treatment
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Allocation is not concealed
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
A computerised sequence generator will be used to randomise participants into the 3 groups. Randomisation will be stratified by insulin use.
Masking / blinding
Blinded (masking used)
Who is / are masked / blinded?



The people analysing the results/data
Intervention assignment
Parallel
Other design features
Phase
Not Applicable
Type of endpoint/s
Efficacy
Statistical methods / analysis
Based on pilot data, a sample size calculation performed using G*Power software estimated that 34 participants are needed per group (n=102) to achieve 80% power required to detect a clinically meaningful 0.4mmol/L2 difference in fasting glucose (d=0.05) between snack and no snack conditions (a<0.05). Accounting for a dropout rate of 15% a total of 117 participants will be recruited.
Data will first be assessed for normality using histograms and Q-Q plots of residuals. One-way repeated measures ANOVA will be used to analyse all outcome variables, and post-hoc tests will be performed using Tukey's HSD. All analysis will be conducted with SPSS software.

Recruitment
Recruitment status
Recruiting
Date of first participant enrolment
Anticipated
30/03/2020
Actual
28/09/2020
Date of last participant enrolment
Anticipated
31/10/2024
Actual
Date of last data collection
Anticipated
19/12/2024
Actual
Sample size
Target
117
Accrual to date
89
Final
Recruitment in Australia
Recruitment state(s)
ACT,NSW,NT,QLD,SA,TAS,WA,VIC
Recruitment postcode(s) [1] 29612 0
2500 - Wollongong

Funding & Sponsors
Funding source category [1] 305138 0
University
Name [1] 305138 0
Illawarra Health and Medical Research Institute
Country [1] 305138 0
Australia
Primary sponsor type
University
Name
University of Wollongong
Address
University of Wollongong
Northfields Ave, Wollongong NSW 2522
Country
Australia
Secondary sponsor category [1] 305497 0
Government body
Name [1] 305497 0
Illawarra and Shoalhaven Local Health District
Address [1] 305497 0
Illawarra Diabetes Service, 304 Crown St, Wollongong NSW 2500
Country [1] 305497 0
Australia

Ethics approval
Ethics application status
Approved
Ethics committee name [1] 305507 0
Joint University of Wollongong and Illawarra Shoalhaven Local Health District Health and Medical Human Research Ethics Committee
Ethics committee address [1] 305507 0
Ethics committee country [1] 305507 0
Australia
Date submitted for ethics approval [1] 305507 0
11/11/2019
Approval date [1] 305507 0
25/02/2020
Ethics approval number [1] 305507 0
2019/ETH13557

Summary
Brief summary
Trial website
Trial related presentations / publications
Public notes

Contacts
Principal investigator
Name 100606 0
Dr Monique Francois
Address 100606 0
School of Medicine, University of Wollongong
NSW 2522, Australia
Ph 4221 5136, RM 41.330
Country 100606 0
Australia
Phone 100606 0
+61 2 42215136
Fax 100606 0
Email 100606 0
francois@uow.edu.au
Contact person for public queries
Name 100607 0
Monique Francois
Address 100607 0
School of Medicine, University of Wollongong
NSW 2522, Australia
Ph 4221 5136, RM 41.330
Country 100607 0
Australia
Phone 100607 0
+61 2 42215136
Fax 100607 0
Email 100607 0
francois@uow.edu.au
Contact person for scientific queries
Name 100608 0
Monique Francois
Address 100608 0
School of Medicine, University of Wollongong
NSW 2522, Australia
Ph 4221 5136, RM 41.330
Country 100608 0
Australia
Phone 100608 0
+61 2 42215136
Fax 100608 0
Email 100608 0
francois@uow.edu.au

Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
No
No/undecided IPD sharing reason/comment


What supporting documents are/will be available?

No Supporting Document Provided



Results publications and other study-related documents

Documents added manually
No documents have been uploaded by study researchers.

Documents added automatically
No additional documents have been identified.