UC Riverside Study Finds High-Intensity Running Does Not Reduce Lifespan in Mice

Researchers at the University of California, Riverside, have found that extreme physical performance does not necessarily reduce an organism’s lifespan or reproductive success. A multi-decade study involving selectively bred mice indicates that high-level athleticism can coexist with biological longevity and fertility, challenging long-standing evolutionary theories that suggest a trade-off between physical exertion and life-sustaining functions.

The study tracked mice bred specifically for high-intensity running over the course of more than 30 years. By comparing these “elite” runners to control groups, the researchers monitored how the animals’ physiological adaptations to exercise influenced their overall health and reproductive output. The data show that the high-activity mice maintained their athletic capabilities without experiencing a decrease in their natural lifespan or a decline in their ability to produce offspring. These findings provide new evidence regarding the biological costs of physical performance, suggesting that organisms may possess the capacity to support both high-energy output and essential life-history traits simultaneously.

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Date: August 13, 2026

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