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Capacity for exercise can be inherited, UC Riverside biologists find
Date:9/1/2010

RIVERSIDE, Calif. Biologists at the University of California, Riverside have found that voluntary activity, such as daily exercise, is a highly heritable trait that can be passed down genetically to successive generations.

Working on mice in the lab, they found that activity level can be enhanced with "selective breeding" the process of breeding plants and animals for particular genetic traits. Their experiments showed that mice that were bred to be high runners produced high-running offspring, indicating that the offspring had inherited the trait for activity.

"Our findings have implications for human health," said Theodore Garland Jr., a professor of biology, whose laboratory conducted the multi-year research. "Down the road people could be treated pharmacologically for low activity levels through drugs that targeted specific genes that promote activity. Pharmacological interventions in the future could make it more pleasurable for people to engage in voluntary exercise. Such interventions could also make it less comfortable for people to sit still for long periods of time."

In humans, activity levels vary widely from couch-potato-style inactivity to highly active athletic endeavors.

"We have a huge epidemic of obesity in Western society, and yet we have little understanding of what determines variation among individuals for voluntary exercise levels," Garland said.

Study results appear online Sept. 1 in the Proceedings of the Royal Society B.

The researchers began their experiments in 1993 with 224 mice whose levels of genetic variation bore similarity to those seen in wild mouse populations. The researchers randomly divided the base population of mice into eight separate lines four lines bred for high levels of daily running, with the remaining four used as controls and measured how m
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Contact: Iqbal Pittalwala
iqbal@ucr.edu
951-827-6050
University of California - Riverside
Source:Eurekalert  

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