Energy balance

Sarcopenia is mechanistically driven by mitochondrial bioenergetic dysfunction, characterized by downregulated PGC-1α/ERRα signaling, reduced oxidative phosphorylation, and low NAD+ levels, rather than primarily by inflammation or denervation.

This research highlights that muscle loss in older adults is fundamentally linked to mitochondrial energy failure and low NAD+ levels, distinct from general inflammation or nerve issues. While this paper does not prescribe a specific exercise or supplement protocol, it strongly suggests that interventions aiming to boost mitochondrial function (e.g., through exercise which stimulates PGC-1α, or potential NAD+ precursors) may be more effective for treating pathological sarcopenia than approaches focused solely on protein intake or anti-inflammatories.