BLACKSBURG, VA, Febuary 29, 2024 – Forget everything you thought you knew about calories. A new study reveals that physical activity boosts your daily energy expenditure-and your body *doesn’t* simply compensate by slowing down elsewhere.
more Movement, More Burn: The Body Doesn’t ‘Cancel Out’ Exercise
Table of Contents
Researchers found that increased physical activity leads to a higher calorie burn without the body reducing energy spent on other essential functions.
- The study, published in the Proceedings of the National Academy of Sciences, challenges the long-held belief that the body treats energy like a fixed budget.
- Researchers measured total energy expenditure in 75 participants with varying activity levels, from sedentary to ultra-endurance athletes.
- Participants tracked their movement with waist-worn sensors and provided samples to measure energy use.
- The findings suggest that simply moving more can led to a greater overall calorie burn.
For years, the debate raged: does your body have a strict energy budget, shifting resources when you become more active? Or can energy expenditure actually *expand* with increased activity? Scientists at Virginia Tech, collaborating with the University of Aberdeen and Shenzhen University, set out to find the answer, and the results are surprisingly good news for anyone trying to manage their weight.
How researchers Measured Calorie Burn
The team didn’t rely on estimates. They measured total energy expenditure – the total number of calories burned each day – in 75 participants ranging in age from 19 to 63. Activity levels spanned a wide spectrum, from largely inactive lifestyles to the grueling routines of ultra-endurance runners.
To pinpoint energy use, participants consumed special forms of oxygen and hydrogen and provided urine samples over a two-week period. By analyzing the isotopes lost through breath and urine, researchers could accurately calculate carbon dioxide production and, ultimately, energy expenditure. A small, waist-worn sensor tracked movement in multiple directions, providing a detailed record of physical activity.
“Our study found that more physical activity is associated with higher calorie burn, regardless of body composition, and that this increase is not balanced out by the body reducing energy spent elsewhere,” explained Kevin Davy, professor in the Department of Human Nutrition, Foods, and Exercise and the principal investigator of the study.
the Body Doesn’t Seem to Compensate
The results were clear: as activity increased, so did total energy use. The body didn’t appear to dial down energy expenditure in essential functions like breathing, circulation, or temperature regulation. This suggests that the extra calories burned through movement aren’t simply “canceled out” by a reduction in energy use elsewhere.
“Energy balance was a key piece of the study,” said Kristen Howard, senior research associate at Virginia Tech and the article’s lead author. “We looked at folks who were adequately fueled. It could be that apparent compensation under extreme conditions may reflect under-fueling.”
sitting Less, Moving More
The researchers also noted a strong correlation between higher activity levels and less time spent sitting.People who moved more simply spent less time being sedentary. This reinforces the idea that even small increases in daily activity can have a significant impact on overall energy expenditure.
While the findings support the idea that increased movement leads to increased calorie burn, the researchers emphasize that more research is needed. “We need more research to understand in who and under what conditions energy compensation might occur,” Davy added.
