Study says pregnancy is the equivalent of running a 40-week marathon

Carrying a baby to term was essentially like running a 40-week marathon, according to shocking new research that likened the amount of energy used as the same as top athletes.

Researchers, which published the findings in Science Advances, looked at human endurance in some of the world’s toughest and longest endurance events. Data was collected from Race Across The USA, a 120-day, a 3,000-mile race that covers nearly a marathon a day for six days per week. Other events like triathlons and the Tour de France were included.

When analyzing the data from the events, researchers looked into metabolic rates for participants in the events. For reference, the highest metabolic rate any human can handle is 2.5 times their resting rate. Top athletes can reach peak calorie burns of around 4,000 calories a day, which is significantly higher than the average adult.

Pregnant women operate at 2.2 times their resting metabolic rate daily, however, that sustains for far longer than any marathon runner as a normal term usually lasts for a duration of 270 days.

“Every mother who has gone through a pregnancy has experienced that effort themselves,” Duke University professor Herman Pontzer told Today’s Parent. “Pregnancy is the longest-duration, highest-energy-expenditure thing that humans can do. Mothers probably aren’t surprised by this.”

The Physiological Demands of Pregnancy

Pregnancy is a remarkable and complex process that places significant physiological demands on the human body. Pregnant women are basically endurance athletes, operating at a level of physical intensity that rivals elite athletes in the most demanding sporting events.

1. Energy Expenditure: Imagine burning calories at a rate that pushes the limits of human capability. According to a study by Duke University, pregnant women operate at 2.2 times their resting metabolic rate (RMR). This is nearly the maximum energy expenditure the human body can sustain, akin to the calorie burn of top-tier athletes.
2. Physical Intensity: Carrying a baby for 40 weeks is no small feat. It’s equivalent to running a 40-week marathon, a prolonged period of physical intensity that is extremely challenging, even for women who are otherwise healthy and fit. The human body is pushed to its limits, maintaining this high level of exertion day in and day out.
3. Comparison to Other Sporting Events: To put it in perspective, the energy expenditure of pregnant women is comparable to that of athletes competing in the Tour de France. While these elite athletes may peak at higher intensities for shorter periods, pregnant women sustain a high level of energy expenditure over a prolonged period of nine months. It’s a marathon that doesn’t end at the finish line but continues for 270 days.
4. Physiological Changes: Pregnancy brings about significant physiological changes, including an increase in resting metabolic rate, cardiac output, and blood volume. These changes are crucial to support the growth and development of the fetus but also place additional demands on the mother’s body. It’s a testament to the incredible adaptability and resilience of the human body.
5. Support System: Navigating the challenges of pregnancy often requires a robust support system. Healthcare providers, family, and a few friends play a critical role in ensuring the health and well-being of both the mother and the baby. This network of support is essential in helping pregnant women manage the physical and emotional demands of this extraordinary journey.
6. Recognition of Pregnancy as an Endurance Event: Despite the significant physiological demands, pregnancy is often not recognized as an endurance event in the same way other sporting events are. However, the physical intensity and prolonged duration make it a remarkable achievement that deserves recognition and respect. By acknowledging the challenges and triumphs of pregnancy, we can better support and celebrate the women who undergo this incredible process.

In conclusion, pregnancy is a remarkable and complex process that places significant physiological demands on the human body. Pregnant women are basically endurance athletes, operating at a level of physical intensity that is comparable to elite athletes competing in demanding sporting events. By recognizing the challenges and achievements of pregnancy, we can better support and celebrate the women who undergo this remarkable process.

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