Interval exercise preserved function in older female mice
Aerobic capacity rose 71% after 14 weeks of training, versus no change in sedentary mice.
9 mice, 14 weeks, randomized
Limit: The long-term memory test could miss short-term cognitive changes
Edited by Boris Djordjevic · AgingResearch.News
In an experiment in 18 female C57BL/6J mice, researchers randomly assigned nine to interval training and nine to sedentary conditions. The mice began at 20 months old and finished at 24 months. Training lasted 14 weeks, with progressively harder treadmill runs separated by walking recovery periods.
Exercised mice maintained overall physical performance, while sedentary mice declined. Their combined cognitive test scores improved, while controls showed no overall improvement. Exercised mice also had less collagen buildup, a measure of scarring, in the heart than sedentary controls. Training mitigated the onset of frailty.
Why it matters
Age-related losses in physical and cognitive function can threaten independence. The experiment addressed whether exercise begun late in life could preserve multiple abilities relevant to independence, rather than fitness alone.
Caveats
This was a small animal experiment with nine mice per group, all females of one strain. It cannot determine whether the same program would benefit people.
From the paper
- Limitation
The current study measures only a single age group, strain, and sex (female C57BL/6J, 24 months old at endpoint), thus confirmation of these findings in similar age groups of males and other strains, as well as in older and younger groups, is required.
Quoted word for word from the full text on link.springer.com.
- High-intensity interval training
- IL-1 signaling
- IL-1β
- Mean arterial pressure
- Systolic blood pressure
- Mice
The paper
East Carolina University
GeroScience, Sep 10, 2026, Open access
