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Assessment of Activity in Pregnancy Using an Actigraph

This study has been completed.
Information provided by (Responsible Party):
Deborah A. Wing, University of California, Irvine Identifier:
First received: July 18, 2007
Last updated: October 18, 2012
Last verified: October 2012
We would like to quantify the amount and type of activity a typical pregnant woman engages in and then compare the pregnancy outcomes of women with varying activity levels. To do this, we will have women wear a device known as an accelerometer (that records activity by measuring changes in voltage levels) at certain times in their pregnancies.

Motor Activity Pregnancy

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Assessment of Activity in Pregnancy Using an Actigraph

Further study details as provided by Deborah A. Wing, University of California, Irvine:

Enrollment: 76
Study Start Date: January 2007
Study Completion Date: December 2010
Primary Completion Date: December 2010 (Final data collection date for primary outcome measure)
Detailed Description:

General findings that have consistently been demonstrated in the literature are that activity tends to decreased during pregnancy from pre-pregnancy levels and that activity in the third trimester is less than in the first trimester. In non-pregnant patients, increase in physical activity and exercise has been associated with improved mood and self-esteem. Although the data in pregnancy is limited, available studies do suggest that inactivity is associated with worse mood. Regular physical activity is not detrimental in low-risk patients and in fact may be beneficial.

Bed rest or activity restrictions are commonly employed interventions for women with a variety of obstetric complications such as preterm contractions, vaginal bleeding, and fetal growth restriction. There is no compelling data to support bed rest as an effective therapeutic modality. There has been some data that occupational work can increase the risk of preterm birth, but other studies have not demonstrated an effect.5 Furthermore, prolonged bedrest can have detrimental effects such as muscle weakness and increased thromboembolic risk, as well as negatively impact familial relations.

The use of the accelerometer is an attempt to objectively quantify physical activity in pregnancy. The accelerometer assesses activity by measuring voltages, and can thus provide information on the intensity of activity. An additional advantage is that it can be worn on the wrist or ankle, whereas pedometers need to be worn on the waist for maximal accuracy which limits their use in pregnant women. This novel study would contribute to the existing literature on pregnancy activity that consists primarily of survey/subjective data to determine what correlation, if any, exists between activity and pregnancy outcome. Secondarily, the study will survey its participants to see if we can corroborate previous studies that have demonstrated a relationship between activity level and patients' moods.


Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Pregnant Women

Inclusion Criteria:

  • Nulliparous
  • First trimester (11-14w)
  • No medical contraindications to normal activity

Exclusion Criteria:

  • Chronic medical conditions that require restricted activity (cardiac disease, severe asthma, etc)
  • Known fetal anomalies
  • Morbid obesity (BMI > 39)
  • Maternal age less than 18 years
  • Inability to comply with instructions
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00503672

United States, California
Long Beach Memorial Medical Center, Miller Children's Hospital
Long Beach, California, United States, 90806
University of California, Irvine
Orange, California, United States, 92868
Sponsors and Collaborators
University of California, Irvine
Principal Investigator: Deborah A Wing, MD University of California, Irvine
  More Information

Responsible Party: Deborah A. Wing, Director of Maternal Fetal Medicine, University of California, Irvine Identifier: NCT00503672     History of Changes
Other Study ID Numbers: 2006-5343
Study First Received: July 18, 2007
Last Updated: October 18, 2012

Keywords provided by Deborah A. Wing, University of California, Irvine:
Motor Activity
Accelerometer processed this record on August 18, 2017