AI Insight
This study investigated whether postpartum aerobic exercise affects the composition of breast milk small extracellular vesicles (sEVs), which are nano-sized particles that carry bioactive molecules (proteins, microRNAs, and metabolites) from mother to infant. The researchers found that a single session of moderate-intensity exercise significantly increased sEV concentration in breast milk, with this effect persisting across multiple subsequent milk collections. Critically, these exercise-enriched sEVs carried regulatory metabolic cargo that enhanced mitochondrial function in neonatal cells, suggesting a potential biological mechanism by which maternal physical activity could program infant metabolic health.
Why it matters
These findings provide a plausible molecular pathway linking postpartum exercise to long-term infant metabolic development, which could inform clinical recommendations for breastfeeding mothers and open new research avenues into early-life metabolic programming through breast milk bioactive components.
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Early life nutrition profoundly influences long-term metabolic health, and breast milk not only provides nutrients but also conveys maternal signals shaping infant metabolic development. While postpartum exercise by lactating women benefits maternal health, its impact on milk-borne signaling remains largely undefined. Small extracellular vesicles (sEVs) in breast milk are key mediators of maternal to infant communication because of their selectively packaged bioactive cargo and resistance to infant digestive enzymes and acids, enabling delivery of their cargo to peripheral tissues. Here, we show that a single session of moderate-intensity postpartum aerobic exercise robustly increases human breast milk sEV concentration, which persists for multiple post-exercise milk collections. Exercise enriches breast milk with sEVs containing regulatory metabolic cargo (proteins, miRNAs, and metabolites), which translates into enhanced mitochondrial capacity in neonatal stage cells. These findings implicate sEVs as an exercise-responsive signaling compartment in breast milk capable of connecting postpartum maternal physical activity to beneficial infant metabolic programming.