Exercise in Pregnancy for Reduction of Blood Pressure in Obese Patients

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01261884
Recruitment Status : Completed
First Posted : December 17, 2010
Last Update Posted : January 16, 2015
Information provided by (Responsible Party):
Richard S. Legro, M.D., Milton S. Hershey Medical Center

Brief Summary:
Preeclampsia and other high blood pressure disorders of pregnancy are a significant cause of both maternal and fetal complications of pregnancy. To date, there is no known "cure" for preeclampsia, but studies have shown that exercise may lower the risk of preeclampsia and high blood pressure disorders in pregnancy. Resistance training also lowers blood pressure, and may be easier to perform in a pregnant population, leading to higher compliance. The investigators propose to perform a novel prospective study of a resistance training regimen on blood pressure in pregnant patients at high risk for developing preeclampsia or high blood pressure.

Condition or disease Intervention/treatment Phase
Hypertension Pregnancy Preeclampsia Exercise Behavioral: Exercise support Behavioral: Exercise intervention Not Applicable

Detailed Description:

Hypertension affects 5-10 percent of pregnancies, and complications from hypertensive disorders of pregnancy are the third leading cause of maternal death in the United States. Hypertensive disorders of pregnancy, including preeclampsia, lead to preterm delivery, morbidity and mortality of mother, fetus, and neonate, and are a predictor of development of chronic maternal hypertension, cardiovascular disease, and renal disease. Maternal obesity is increasing dramatically in the patient population, and is an independent risk factor for hypertension and preeclampsia, increasing the risk by two- to four-fold. To date, no effective preventative measure has been found to reduce the risk of preeclampsia or hypertension in high risk pregnant patients. However, observational studies have shown that patients who exercise or who have increased physical activity before and during pregnancy have lower rates of preeclampsia, hypertension, and gestational diabetes. Exercise has been shown in numerous studies to be safe in pregnancy, and is recommended by the American College of Obstetrics and Gynecology as part of routine prenatal care. However, aerobic exercise can be viewed by patients to be difficult to perform during pregnancy, particularly when the patient is obese and at later gestations. Adherence to exercise regimens is therefore low in this patient group. Dynamic resistance training has been shown to lower mean blood pressure both acutely and long term in non-pregnant hypertensive patients, and can be performed more easily by patients with mobility issues. This intervention has not been studied in an obese pregnant population for its effects on blood pressure throughout pregnancy.

The long term goal is to develop an intervention that will reduce the barriers to exercise of obese pregnant women that will, in turn, reduce their risk of developing preeclampsia and other hypertensive disorders of pregnancy. The specific objective of this proposal is to study the effect of a structured resistance training exercise intervention on blood pressure in obese pregnant woman, who would be considered high risk for development of hypertensive disorders based on pre-pregnancy BMI. The central hypothesis is that obese pregnant patients who participate in a regular, structured resistance training exercise regimen will have a decrease in mean arterial blood pressure compared to obese pregnant patients who are strongly encouraged to do aerobic exercise (lifestyle intervention) or who participate in routine prenatal care. The investigators formulated this hypothesis, in part, based upon previous studies found in the literature performed in non-pregnant hypertensive patients. The investigators will extrapolate from the experience and methods of the collaborators, who have studied the effects of exercise on gestational diabetes.

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 66 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: Exercise Intervention in Pregnancy for Reduction of Blood Pressure in Obese Gravidas
Study Start Date : November 2010
Actual Primary Completion Date : July 2014
Actual Study Completion Date : January 2015

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
No Intervention: Routine prenatal care
Experimental: Exercise support Behavioral: Exercise support
Group B (exercise support) will be given the ACOG pamphlet on exercise in pregnancy, a daily activity log, and a pedometer. This group will be asked to wear the pedometer for 7 consecutive days between Visits 1 and 2, and record daily activities.

Experimental: Exercise intervention Behavioral: Exercise intervention
Group C (exercise intervention) will be given the ACOG pamphlet on exercise in pregnancy, a daily activity log, a pedometer, a resistance band, and a handout on specific exercises (type and frequency) to be performed. The study coordinator will demonstrate each exercise and then observe the participant perform each exercise to assure full understanding. In addition to wearing the pedometer for 7 days and completing the activity log, this group will also record compliance with the exercise regimen.

Primary Outcome Measures :
  1. Change in mean arterial blood pressure [ Time Frame: <13 weeks gestation-postpartum visit ]

Secondary Outcome Measures :
  1. Hypertension of pregnancy or preeclampsia
  2. Gestational weight gain
  3. Neonatal weight
  4. Proteinuria
  5. Serum markers for hypertension risk
  6. Activity level
    Measured with activity logos

  7. Number of steps per week
    Pedometer measurement

  8. Weight retention at postpartum visit
  9. Mode of delivery
    Vaginal versus cesarean

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Patient's BMI must be ≥ 30 and ≤ 40.
  • Established viable singleton pregnancy <13 weeks

Exclusion Criteria:

  • Multiple gestations.
  • Maternal diabetes established pre-pregnancy by standard guidelines
  • Congenital or acquired heart disease
  • Use of antihypertensive medication
  • Inability to exercise
  • Restrictive lung disease
  • History of shortened/incompetent cervix
  • History of preterm labor

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01261884

United States, Pennsylvania
Penn State Milton S. Hershey Medical Center
Hershey, Pennsylvania, United States, 17033
Sponsors and Collaborators
Milton S. Hershey Medical Center

Responsible Party: Richard S. Legro, M.D., Professor, Obstetrics and Gynecology and Public Health Sciences, Milton S. Hershey Medical Center Identifier: NCT01261884     History of Changes
Other Study ID Numbers: 33905
First Posted: December 17, 2010    Key Record Dates
Last Update Posted: January 16, 2015
Last Verified: January 2015

Keywords provided by Richard S. Legro, M.D., Milton S. Hershey Medical Center:
Resistance exercise

Additional relevant MeSH terms:
Vascular Diseases
Cardiovascular Diseases
Hypertension, Pregnancy-Induced
Pregnancy Complications