Nicotinamide riboside supplementation reduced epigenetic age acceleration in skeletal muscle over five months, while high-intensity interval training produced divergent effects depending on the measurement method used. Changes in mitochondrial content correlated with epigenetic aging shifts, suggesting mitochondrial function as a mechanistic link between these interventions and cellular aging markers.
Key Points
- NR supplementation reduced muscle epigenetic age acceleration consistently
- HIIT increased aging pace on some epigenetic clocks, decreased on others
- Mitochondrial content changes correlated with epigenetic aging shifts
Longevity Analysis
These findings establish that cellular aging signatures in muscle tissue respond to intervention, but the response depends critically on both the intervention type and which measurement framework you use — a reminder that aging is not monolithic. The correlation between mitochondrial abundance and epigenetic changes points to energy production as a central variable in aging rate, suggesting that strategies targeting mitochondrial health may influence how rapidly cells accumulate age-related damage at the molecular level. The divergent response to exercise versus supplementation also suggests that these interventions work through different pathways, which has immediate implications for how practitioners design protocols that actually reverse aging markers rather than merely shift them around.
Original published by Wiley Aging Cell, by Aino Heikkinen, Liina Uusitalo‐Kylmälä, Ida Blom, Jørn Wulff Helge, Linn Gillberg, Robert Seaborne, Steen Larsen, Macsue Jacques, Robin Grolaux, Sari Aaltonen, Jaakko Kaprio, Birgitta W. van der Kolk, Sini Heinonen, Nir Eynon, Kirsi H. Pietiläinen, Riikka Kivelä, Eija Pirinen, Miina Ollikainen .