Research
Hormonal
While endurance exercise normalizes most mitochondrial protein expression and ATP production capacity, it does not fully restore mitochondrial DNA (mtDNA) abundance or all nuclear transcription factors to young levels.
Even with decades of endurance training, some molecular markers of aging (like mtDNA copy number) may not fully revert to youthful levels. However, the functional output (ATP production) is largely preserved, suggesting functional compensation for these residual molecular deficits.
GoodQualifiesHIGH confidence
Although endurance-trained individuals exhibited higher expression of mitochondrial proteins, mtDNA, and mitochondrial transcription factors, there were persisting effects of age.
Why this rating
Clear cross-sectional data showing partial normalization.
Source
Endurance Exercise as a Countermeasure for Aging
Ian R. Lanza et al. · Diabetes · 2008
DOI 10.2337/db08-0349
cross_sectional · n=42Cited 582×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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