Brain health runs through muscle and arteries: the muscle-vascular-brain axis
In short
This review ties skeletal muscle, the peripheral vasculature and the brain into a single muscle-vascular-brain axis. Skeletal muscle regulates myokine release through motor neuron function, contractile activity and metabolic perturbations, influencing neuroplasticity, mitochondrial function and inflammatory signaling, while vascular properties such as arterial stiffness act directly on cerebral perfusion and blood-brain barrier permeability. The authors' conclusion is that muscle and vasculature are modifiable systems — meaning interventions aimed at the periphery, resistance training among them, are scalable brain-health strategies across the lifespan.
The brain has long been handled as a top-down regulator of vital functions. The evidence this review synthesises runs the other direction — cognition is affected by signals arriving from peripheral organs, and the two systems shaping those signals most are skeletal muscle and the peripheral vasculature.
The practical weight of that framing comes down to one thing. Brain tissue cannot be trained directly, but muscle and arteries can. That is exactly why the authors call these two modifiable systems.
What does muscle send to the brain?
Skeletal muscle regulates myokine release through three routes — motor neuron function, contractile activity and metabolic perturbations. Myokines are signaling proteins the muscle releases into circulation as it contracts. The review names three downstream effects.
- Neuroplasticity — the capacity of neural circuits to rewire and reorganise
- Mitochondrial function — energy production at the cellular level
- Inflammatory signaling — regulation of chronic low-grade inflammation
One more route sits on top of those. Signals from muscle may also affect measures of peripheral vascular function such as reactive hyperemia. Muscle therefore holds both a direct line to the brain and an indirect one routed through the vasculature.
Where do the arteries come in?
The vascular side is more direct. Vascular properties including arterial stiffness act immediately on cerebral perfusion and blood-brain barrier permeability. Perfusion is how much oxygen and glucose reach the brain; barrier permeability is what leaks into it. Stiffened arteries degrade both at once.
Why do dementia and cardiometabolic disease travel together?
Co-occurrence is one of the observations that motivates the axis. Alzheimer's disease and related dementias frequently coexist with cardiovascular and metabolic disorders, and the two share substantial overlapping pathophysiology. The interorgan communication framing explains that co-occurrence not as coincidence but as the product of shared mechanisms.
This paper is a synthesis of mechanisms, not a randomised controlled trial. No effect sizes, no prescribed doses, no sets and reps per week appear in it, and the authors' own language stays at "may". For actual numbers, cognitive outcomes by intensity are in resistance training and cognitive health, and vascular markers by exercise modality in lifting and artery health.
What a Big 3 lifter should take from it
Take the axis at face value and filling in the muscle end is only half of it. Skeletal muscle at one end is handled by squat, bench and deadlift, but the vasculature in the middle is not fully covered by resistance training alone — separate data already shows resistance work and aerobic work leading on different vascular markers.
Translated into logging: a Muscle Index score tracks only the muscle input on this axis. A rising Big 3 total carries no guarantee that arterial stiffness improved with it, and this review does not claim it does. Keep training the score, and keep the vascular side as its own line item — something like zone 2 cardio for lifters fits the model better than assuming one covers the other.
Frequently asked questions
What is the muscle-vascular-brain axis?
It is a model in which skeletal muscle, the peripheral vasculature and the brain exchange signals that jointly determine cognitive health. Muscle acts through myokines and the vasculature through cerebral perfusion and blood-brain barrier permeability, and the review frames both as systems that training can modify.
How does muscle influence the brain?
Skeletal muscle regulates myokine release through motor neuron function, contractile activity and metabolic perturbations, and those signals influence neuroplasticity, mitochondrial function and inflammatory signaling. They may also affect peripheral vascular measures such as reactive hyperemia.
What does arterial stiffness have to do with the brain?
Vascular properties including arterial stiffness act directly on cerebral perfusion and blood-brain barrier permeability. Perfusion governs how much blood reaches the brain and permeability governs what enters it, so stiffened arteries degrade both measures simultaneously.
Why do dementia and cardiovascular disease appear together?
Alzheimer's disease and related dementias share substantial overlapping pathophysiology with cardiovascular and metabolic disorders. Under an interorgan communication framing, that coexistence is read not as coincidence but as several organ systems failing through mechanisms they share.
Can this evidence set a resistance training prescription?
No. The paper is a mechanistic synthesis rather than a randomised controlled trial, and it reports neither effect sizes nor doses. The authors' conclusion goes only as far as saying that peripherally targeted interventions such as resistance training may help preserve brain health.
Source: PubMed