SIRT1 as an exerkine: how exercise reprograms cellular aging

Recent research demonstrates that SIRT1, activated by physical activity, functions as a true exerkine—a molecular messenger translating movement into cellular anti-aging adaptations. Initially identified as a histone deacetylase, SIRT1 has revealed far broader roles: orchestrating mitochondrial dynamics, regulating metabolic pathways, controlling autophagy, modulating inflammation, and balancing oxidative stress, directly influencing healthspan extension. Both acute and chronic exercise protocols—aerobic training, resistance work, and combined modalities—increase SIRT1 messenger RNA levels and protein activity across adipose tissue, hippocampus, heart, liver, bone, and skeletal muscle in aged rodents and older humans. Research indicates that maintaining optimal SIRT1 levels—achievable without pharmacology, through structured training alone—preserves genomic integrity and acts as a dynamic sensor of exercise benefits. For the longevity-conscious reader, this repositions exercise not as generic habit, but as precision tool for sustaining the molecular program of cellular youth across decades.