Hormonal
Acute moderate-intensity endurance exercise increases nuclear p53 abundance in untrained human skeletal muscle, suggesting a pro-autophagy response to clear damaged components before mitochondrial biogenesis.
For untrained individuals, a single 60-minute moderate-intensity cardio session triggers a cellular cleanup process (autophagy) mediated by p53 moving to the cell nucleus. This cleanup likely happens before the muscle builds new mitochondria. To support this natural adaptation, ensure you are recovering adequately and maintaining consistent activity levels.
The selective increase in nuclear p53 abundance following endurance exercise suggests a potential pro-autophagy response to remove damaged proteins and organelles prior to initiating mitochondrial biogenesis and remodeling responses in untrained individuals.
Why this rating
Small sample size (n=8 exercise, n=6 control), single bout design, and lack of functional autophagy flux measurement (only protein abundance).
Source
Acute Endurance Exercise Induces Nuclear p53 Abundance in Human Skeletal Muscle
Bill Tachtsis et al. · Frontiers in Physiology · 2016
DOI 10.3389/fphys.2016.00144
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