Skeletal muscle plays a direct, active role in supporting brain health and cognitive function through a physiological pathway known as the muscle-brain axis.
Quadriceps (Leg Muscles): Large lower-body muscle groups like the quads show the strongest clinical correlations with brain health; higher leg strength predicts better cognitive function, faster gait speed, and less age-related brain shrinkage (gray matter loss).
- General Skeletal Muscle Mass: Making up roughly 40% of body mass, overall skeletal muscle acts as an endocrine organ rather than just a mechanical frame.
- Myokines: Signaling proteins—such as Cathepsin B (Ctsb), Irisin, and Interleukin-6 (IL-6)—stimulate the growth of new brain cells (neurogenesis), improve synaptic plasticity, and reduce harmful neuroinflammation.
- Brain-Derived Neurotrophic Factor (BDNF): Often called "fertilizer for the brain," BDNF production is boosted by muscle contractions, helping protect, repair, and regenerate brain neurons.
- Weightlifting, resistance bands, or bodyweight exercises build muscle strength and trigger myokine release.
- Short bursts of intense cardio (such as stationary cycling or fast walking/jogging) enhance cellular power plants (mitochondria) in both muscles and the brain.
When skeletal muscles contract during exercise, they release chemical messenger molecules that travel through the bloodstream and cross the blood-brain barrier
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