Be Healthy in Pregnancy (BHIP) With Nutrition and Exercise (BHIP)

Excess weight gain in pregnancy is a major problem affecting 55-75% of Canadian women who enter pregnancy overweight or obese and about 40% of women who are normal weight. Excess weight gain puts mothers at risk for health problems such as diabetes and developing or sustaining obesity after pregnancy, and puts their babies at risk of being born too large or developing related health problems. Mothers will be randomized to a structured high dairy protein diet and walking program or the usual care by their care provider. The investigators research questions are: Will a structured nutrition and exercise program in pregnancy compared to usual prenatal care increase the chance that mothers will achieve pregnancy weight gain within the current recommendations; improve health measures, in mother and infant at six months post-partum; to evaluate the benefits of a high dairy intake in pregnancy on maintenance of bone status in the mother and bone health outcomes in the child in early life (6 months); and to investigate the interactions between genes associated with bone health and high dairy diet supplementation on bone status in mothers during pregnancy, and bone health in mothers post-delivery and children to 6 months of age. Mothers' weight, physical activity and adherence to the nutrition plan will be assessed until birth and at follow-up with their infants at 6 months after birth. The research team will ensure new information is quickly transferred to programs to assist women to have healthier pregnancies.

Study Overview

• Status: Completed
• Conditions: Pregnancy Complications; Weight Gain
• Intervention / Treatment: Behavioral: Structured + monitored nutrition and exercise intervention

Detailed Description

This will be a 2-arm randomized 3-site trial. Recruitment will be within the community care clinics by poster and flyer advertisements. Pregnant women will be stratified by BMI categories and study site and randomized within strata to Group A (Nutrition+Exercise intervention program) or Group B (Usual Prenatal Care + Health Canada materials about healthy pregnancy + two focus group sessions exploring women's experiences with exercise, nutrition and weight gain in pregnancy).

Primary research question: Among pregnant women, does introducing a structured and monitored nutrition and exercise program (treatment) in early pregnancy compared with Usual Prenatal Care (control) increase the likelihood of attaining gestational weight gain within the Institute of Medicine (IOM) guidelines over the pregnancy period? Secondary research questions: Among pregnant women (population), does introducing a structured and monitored nutrition and exercise program in early pregnancy (intervention) compared with Standard Prenatal Care (control) lead to 1) better maternal outcomes (outcome) at 6 months post- partum; and ii) better infant outcomes (outcome) at 6 months post partum?; and 2) i) to evaluate the benefits of a high dairy intake in pregnancy on maintenance of bone status in the mother and bone health outcomes in the child in early life (6 months); and ii) to investigate the interactions between genes associated with bone health and high dairy diet supplementation on bone status in mothers during pregnancy, and bone health in mothers post-delivery and children to 6 months of age.

Experimental and Control groups: Both groups of mothers and their health care providers will be given the Health Canada materials on "Healthy Weight Gain during Pregnancy", "Eating Well with Canada's Food Guide" and the "Pregnancy Weight Gain Calculator". Baseline information will be recorded for eligible and consenting women after which they will be randomized to Experimental or Control group. Nutrition intake, physical measures and physical activity will be recorded at baseline, 26-28 weeks, 36-38 weeks of gestation, and 6 months postpartum in the same manner for both groups. All mothers will receive the study promotional materials and small incentives. Also, all mothers will be followed by their primary care provider and have usual access to public health.

• Study Type: Interventional
• Enrollment (Actual): 242
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Canada
  • Ontario
    • Burlington, Ontario, Canada
      • Burlington Midwives Clinic
    • Hamilton, Ontario, Canada, L8S 1A4
      • McMaster Family Health Team
    • Hamilton, Ontario, Canada
      • Hamilton Midwives Clinics
    • London, Ontario, Canada, N6A 5C1
      • Exercise and Pregnancy Laboratory

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 60 years (Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Female

Description

Inclusion Criteria:

• Healthy pregnant females > 18 years of age with singleton pregnancies (either nulliparous or multiparous);
• less than 17 weeks gestation;
• a pre pregnancy BMI < 40 kg/m2 (owing to the fact that severe obesity with BMI> 40 may have limitations with respect to physical activity);
• plans to deliver at a Hamilton or London regional hospital or by home birth and willing to attend research visits at the community site where they were recruited;
• able to tolerate dairy foods;
• approval of primary care provider;
• able to provide signed informed consent.

Exclusion Criteria:

• unable to understand some English;
• type 1 or type 2 diabetes;
• known contraindications to exercise as recommended by the Canadian clinical practice guidelines for pregnancy;
• severe gastrointestinal diseases or conditions;
• any significant heart, kidney, liver or pancreatic diseases;
• pre-existing diabetes;
• currently smoking;
• a depression score 12 or above on the validated Edinburgh depression questionnaire.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Nutrition+Exercise Intervention; Structured + monitored nutrition and exercise intervention: The exercise intervention includes a custom-designed pregnancy-specific group walking class of 30-60 min. 1x/week and a prescribed at-home walking program for 10,000 steps/day. The nutrition intervention is a high protein (25% energy) low-fat dairy food plan designed to meet energy needs and with individualized counselling. The intervention will include 2 x/month weight monitoring and records of nutrition and activity to ensure adherence	Behavioral: Structured + monitored nutrition and exercise intervention; The exercise intervention includes a custom-designed pregnancy-specific group walking class of 30-60 min. 1x/week and a prescribed at-home walking program for 10,000 steps/day. The nutrition intervention is a high protein (25% energy) low-fat dairy food plan designed to meet energy needs and with individualized counselling. The intervention will include 2 x/month weight monitoring and records of nutrition and activity to ensure adherence.
No Intervention: Usual Prenatal Care; Mothers in the Control Group will be followed by their primary care provider and have usual access to public health services. In addition, they will be asked to attend 2 focus group sessions exploring women's experiences with exercise, nutrition, and weight gain in pregnancy. Women will receive information about healthy pregnancy from Health Canada.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Gestational weight gain within IOM guidelines	Among pregnant women (population), does introducing a structured and monitored nutrition and exercise program (treatment) in early pregnancy compared with Usual Prenatal Care (control) increase the likelihood of attaining gestational weight gain within the IOM guidelines (outcome) over the pregnancy period?	Change from baseline at 38 weeks gestation

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Maternal and infant outcomes	The secondary research question is whether the proposed intervention will result in i) better maternal outcomes (outcome) at 6 months post- partum; and ii) better infant outcomes (outcome) at 6 months post partum?	6 months postpartum
Bone health of mother and baby	In mother: plasma/serum measures of bone mineralization and bone resorption and vitamin D status; bone mineral density as measured by dual energy x-ray absorptiometry scan. In infant: bone mineral content as measured by dual energy x-ray absorptiometry scan.	6 months post-partum

Collaborators and Investigators

• Sponsor: McMaster University
• Collaborators: Canadian Institutes of Health Research (CIHR); Dairy Farmers of Canada; Agriculture and Agri-Food Canada
• Investigators: Principal Investigator: Stephanie A Atkinson, PhD, McMaster University

Publications and helpful links

General Publications

• Perreault M, Mottola MF, Atkinson SA; BHIP study team. Individualized high dairy protein + walking program supports bone health in pregnancy: a randomized controlled trial. Am J Clin Nutr. 2022 Oct 6;116(4):887-896. doi: 10.1093/ajcn/nqac182.
• Murray-Davis B, Grenier L, Atkinson SA, Mottola MF, Wahoush O, Thabane L, Xie F, Vickers-Manzin J, Moore C, Hutton EK. Experiences regarding nutrition and exercise among women during early postpartum: a qualitative grounded theory study. BMC Pregnancy Childbirth. 2019 Oct 21;19(1):368. doi: 10.1186/s12884-019-2508-z.
• Perreault M, Atkinson SA, Mottola MF, Phillips SM, Bracken K, Hutton EK, Xie F, Meyre D, Morassut RE, Prapavessis H, Thabane L; BHIP Study team. Structured diet and exercise guidance in pregnancy to improve health in women and their offspring: study protocol for the Be Healthy in Pregnancy (BHIP) randomized controlled trial. Trials. 2018 Dec 19;19(1):691. doi: 10.1186/s13063-018-3065-x.

Study record dates

Study Major Dates

• Study Start (Actual): November 1, 2012
• Primary Completion (Actual): October 30, 2018
• Study Completion (Actual): April 30, 2019

Study Registration Dates

• First Submitted: September 13, 2012
• First Submitted That Met QC Criteria: September 20, 2012
• First Posted (Estimate): September 21, 2012

Study Record Updates

• Last Update Posted (Actual): October 1, 2020
• Last Update Submitted That Met QC Criteria: September 30, 2020
• Last Verified: March 1, 2019

More Information

Terms related to this study

• Keywords: Nutrition; Physical activity; Gestational weight gain; Pregnancy outcomes; Birth
• Additional Relevant MeSH Terms: Body Weight; Body Weight Changes; Weight Gain; Pregnancy Complications
• Other Study ID Numbers: 12-469

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO