Brief
Childhood activity may lower adult movement energy, Penn State study finds
Researchers found that birds raised with extra leg weight required less energy to move as adults, suggesting early exercise could ease adult activity.
By Felo News Desk · Published
Researchers at Penn State University report that physical activity during childhood can make movement more energy‑efficient in adulthood, based on experiments with guinea fowl.
What happened
The team attached small weights to the leg of young guinea fowl, a two‑legged bird related to chickens, and raised them to maturity. When the birds reached adulthood, the researchers measured the energy they expended while walking with the same added load.
Birds that grew up carrying the extra weight walked with the load without a rise in metabolic cost. By contrast, birds raised without weights needed about 23% more energy to carry the same load.
What the reports add
ScienceDaily notes that the findings, published in Proceedings of the Royal Society B, provide the first direct evidence that developmental experiences can alter adult movement efficiency. The outlet emphasizes that the study challenges the prior view that the energy demands of locomotion are largely fixed.
What was said
"This study showed how limb loading — the application of mechanical stress on arms or legs, typically through weights or exercise — during development can help an animal save energy during movement throughout its lifespan," Jonas Rubenson, senior author and professor of kinesiology at Penn State, told ScienceDaily.
Rubenson added that the results suggest early activity could influence how much effort adults need to expend for everyday movements, potentially affecting their willingness to exercise.
How it came about
The research builds on a long‑standing hypothesis that early‑life physical experiences shape later physiological traits. By using a bird model that walks on two legs like humans, the scientists aimed to create a comparable system for studying locomotor efficiency. The study’s broader relevance is highlighted by Rubenson, who points to declining physical activity levels among U.S. children and the possible public‑health benefits of encouraging more play and exercise in youth.
Key facts
- Birds raised with extra leg weight walked with the load without increased energy use. (sciencedaily.com)
- Birds raised without weights needed about 23% more energy to carry the same load as adults. (sciencedaily.com)
- The study was published in Proceedings of the Royal Society B, Biological Sciences. (sciencedaily.com)
- Jonas Rubenson is a professor of kinesiology at Penn State and senior author of the study. (sciencedaily.com)
- The research suggests early limb loading may make adult movement more energy‑efficient. (sciencedaily.com)
Sources
- [1] sciencedaily.com — originally reported as “The secret to easier exercise as an adult may start in childhood”
