Clinical trial NCT02148965: Effects of Exercise During Pregnancy on Maternal and Child Health: a Randomized Clinical Trial
Official title: Effects of Exercise During Pregnancy on Maternal and Child Health: a Randomized Clinical Trial
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Gestational Hypertension
Prematurity
Maternal Post-partum Depression
Maternal Post-partum Weight Retention
Child's Development
Keywords: motor activity
clinical trials
pregnancy
hypertension
cohort studies
Lead sponsor: Federal University of Pelotas
Sponsor class: OTHER
First posted: 2014-05-29
Enrollment: 639
Sex: FEMALE
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

Brief summary: The Pamela Study is a clinical trial carried out during pregnancy to assess the potential effects of physical activity during pregnancy among previously inactive women. The trial is nested into a birth cohort of more than 4000 dyads (mother-child) and took place in Pelotas, Brazil.

Detailed description: Introduction World Health Organization estimates that nearly 10% of births are preterm worldwide. In the city of Pelotas, based on previous population studies, the preterm birth rate is increasing (6.3% to 14.7% from 1982 to 2004). Preterm birth (PB) is a major public health issue as it is associated to most cases of neonatal deaths and its consequences are linked to later health outcomes.

One of the strongest predictors of PB is gestational hypertension (or eclampsia). PB risk and gestational hypertension may be altered by maternal behavior, such as leisure-time physical activity (LTPA), and overall maternal health influences the likelihood of both outcomes occurring. Biological plausibility lies on the fact that hypertension conditions are potentially influenced by LTPA directly or indirectly (as in the relation between excessive gestational weight gain and physical activity). Also, there is evidence that mental health plays a role in the determination of PB and, although biased by cross-sectional nature of studies, literature shows that physical activity may influence positively psychological aspects during pregnancy.

In Brazil less than 20% of pregnant women are physically active during leisure. Physical activity during pregnancy is associated to several characteristics resulting in improved health profiles that could potentially decrease hypertension occurrence and consequently preterm birth rates. However, few clinical trials have been carried out to study such relationship in representative population samples and many of the available evidence are based solely on observational studies.

Although early studies on the effects of leisure-time physical activity during pregnancy were concerned about potential harmful effects to the health of the mother and the fetus, these have not been proven over time. Currently, there is growing evidence supporting the safe promotion of physical activity during pregnancy targeting benefits to maternal and child health. However, most of the scientific evidence derives from observational studies. There is an urgent need for results from well-designed experimental studies that enable a better understanding of the impact of exercise during pregnancy on various health outcomes maternal and child.

Methodology The intervention will start after the 12th and before the 20th week of gestation and will last until the end of pregnancy or when women feel uncomfortable with the exercise routine. The intervention will consist of three weekly exercise sessions. Each session will last around 60 minutes and will include aerobic exercises (treadmill or stationary cycling) and strength training (with focus on major muscle groups and pregnancy-specific exercises to help alleviate low back pain and work abdominal and pelvic floor muscles to prevent urinary incontinence). Workouts will be guided and supervised by physical education professionals previously trained. The intensity of the exercises will be set according to woman's fitness level and will be altered according to the progress of pregnancy based on the perceived effort. All exercise sessions will take place at the School of Physical Education from the Federal University of Pelotas.

Eligibility criteria: Inclusion Criteria:

* Pregnant women who are at least in their 20th week of gestation, living in the city of Pelotas (Brazil), whose deliveries are due to 2015 and belonging to the 2015 Birth Cohort.

Exclusion Criteria:

* Hypertension
* Diabetes
* Preterm birth history
* Miscarriage history
* Heart disease
* In vitro fertilization
* Twin pregnancy
* Persistent bleeding
* Body mass index above 35kg/m2
* Heavy smokers (above 20 cigarettes/day)
* Active women (\>150 min/week of physical activity).

Primary outcomes:
measure: Prematurity
timeFrame: Women will be interviewed at hospital soon after birth (up to 2 days after delivering)
Secondary outcomes:
measure: Maternal post-partum depression
timeFrame: 3 months after the end of intervention
measure: Child's development
timeFrame: Children will be followed-up and evaluated by the ages of 3, 12 and 24 months of age
Other outcomes:
Locations:
city: Pelotas
country: Brazil
facility: Physical Education School
state: Rio Grande Do Sul
Study officials:
affiliation: Federal University of Pelotas
name: PEDRO C HALLAL, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Coll CVN, Domingues MR, Stein A, da Silva BGC, Bassani DG, Hartwig FP, da Silva ICM, da Silveira MF, da Silva SG, Bertoldi AD. Efficacy of Regular Exercise During Pregnancy on the Prevention of Postpartum Depression: The PAMELA Randomized Clinical Trial. JAMA Netw Open. 2019 Jan 4;2(1):e186861. doi: 10.1001/jamanetworkopen.2018.6861.
citation: da Silva SG, Hallal PC, Domingues MR, Bertoldi AD, Silveira MFD, Bassani D, da Silva ICM, da Silva BGC, Coll CVN, Evenson K. A randomized controlled trial of exercise during pregnancy on maternal and neonatal outcomes: results from the PAMELA study. Int J Behav Nutr Phys Act. 2017 Dec 22;14(1):175. doi: 10.1186/s12966-017-0632-6.
citation: Domingues MR, Bassani DG, da Silva SG, Coll Cde V, da Silva BG, Hallal PC. Physical activity during pregnancy and maternal-child health (PAMELA): study protocol for a randomized controlled trial. Trials. 2015 May 24;16:227. doi: 10.1186/s13063-015-0749-3.