Exercise raised certain fat molecules only in lean mice
In a treadmill experiment, obese and 18-month-old male mice lacked the fat-tissue increase seen in lean mice; blood levels changed little.
Limit: Aged mice were assessed only immediately after exercise, leaving three-hour changes unmeasured
Edited by Boris Djordjevic · AgingResearch.News
Previously untrained male C57BL/6J mice took part in an exercise experiment: lean mice aged 4.5 months, obese mice aged 5 months and aged mice of 18 months. The obese group had eaten a high-fat diet for 11 weeks. After four hours without food, mice ran on a treadmill to exhaustion. Controls did not run.
The researchers measured fatty acid esters of hydroxy fatty acids, a family of fat molecules, in fat tissue and blood. Exercise raised total fat-tissue levels only in lean mice, with a further rise three hours later. The effect exceeded that of fasting alone. Total blood levels did not increase in any group. Obese and aged mice had lower fat-tissue levels before exercise. Exercise also stimulated fat breakdown less strongly in obese and aged mice than in lean mice.
Why it matters
Exercise training can improve the body's response to insulin, a hormone that regulates blood sugar, and raise levels of some of these molecules in humans. This experiment addressed how aging might alter a fat-tissue response to a single exercise session.
Caveats
This single-session experiment in male mice did not test long-term exercise or health benefits in people. Lean and obese exercise groups had six mice per time point; aged mice were assessed only immediately after exercise.
- Acute treadmill exercise
- Lipid and ceramide metabolism
- Lipid droplet
- Obesity
- Fatty acid esters of hydroxy fatty acids
- Mice
The paper
Czech Academy of Sciences
Experimental Physiology, Jul 25, 2026, Open access
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