Pregnancy exercise trial found fitness gains, but no clear birth-outcome benefit
Among previously sedentary pregnant people with obesity, an exercise program improved fitness measures. Most other maternal outcomes and birth outcomes did not show significant benefits.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
In previously sedentary pregnant people with obesity, the exercise program improved measures of cardiorespiratory fitness. It did not produce statistically significant differences in gestational weight gain, inflammation or birth outcomes compared with standard care. The study therefore supports a fitness finding in this specific group, while broader maternal and newborn benefits remain uncertain.
The abstract does not give effect magnitudes for the fitness changes or detailed adverse-event counts. It therefore offers limited information for judging the size of benefits or the authors' safety conclusion.
What researchers found
Weight gain, inflammation and birth outcomes
Exercise versus standard care during pregnancy through delivery; the abstract reports no significant effects on gestational weight gain, systemic inflammation or birth outcomes.
What the program tested
The program combined aerobic activity, resistance exercises and stretching. Researchers assessed fitness with a treadmill test and also tracked body composition, energy expenditure, mood, stress and biological measures during pregnancy.
Fitness and broader outcomes
Fitness outcomes changed differently between groups over time, while most other maternal measures did not show significant group differences. This distinction matters because improved test performance cannot be assumed to produce better delivery outcomes.
The original publication
The Effect of an Exercise Program on Maternal Health and Birth Outcomes in Sedentary Pregnant Participants with Obesity: Randomized Controlled Trial.
Holmes CJ, Diniz-Sousa F, Sims CR et al.
Med Sci Sports Exerc · 2026
- PubMed ID
- 41168681
- Record checked
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