Longevity & AgingEarly-Life Exercise Boosts Healthspan in Mice Without Adding Years to Lifespan
Researchers at Fourth Military Medical University found that C57BL/6J mice that swam 90 minutes daily from ages 1–4 months showed lasting health improvements well into old age, even after years without exercise. Despite these benefits — including better body composition, lower insulin, improved heart function, reduced inflammation, and greater muscle strength — early-life exercise did not significantly extend median or overall lifespan. The maximum lifespan (longest-lived 5%) was modestly increased in both sexes. Multi-organ transcriptomics pointed to enhanced fatty acid metabolism in skeletal muscle as a key molecular signature. The findings suggest early-life physical activity programs healthspan-related pathways that persist across the entire lifespan, even without continued exercise.
