Dissecting the exercise pressor reflex in heart failure: A multi-step failure.
Level 5 - mechanism / opinion, no new human data
Narrative review of human and animal mechanistic research without systematic methodology or original data.
PubMed 40117701 · doi:10.1016/j.autneu.2025.103269
What was done
This narrative review summarizes literature from animal and human studies detailing the exercise pressor reflex (EPR) in health and heart failure. It synthesizes mechanisms across key reflex components: group III and IV muscle afferent sensitivity, spinal cord signal transmission, brainstem central processing, and end-organ responsiveness, primarily focusing on heart failure with reduced ejection fraction (HFrEF) alongside available data on heart failure with preserved ejection fraction (HFpEF).
What was found
The abstract reports no quantitative values or effect estimates. It qualitatively describes that heart failure causes multi-step dysfunction in the exercise pressor reflex, marked by excessive sympathetic activation, blunted parasympathetic withdrawal, and impaired hemodynamic regulation during physical exertion.
Why it matters
It outlines the multi-site physiological breakdown of autonomic cardiovascular regulation during exercise in heart failure, helping explain the pathophysiology of patient exercise intolerance.
Limits
The review relies on narrative synthesis without systematic search criteria or meta-analytic pooling. Most underlying data derive from HFrEF with sparse data for HFpEF, and central neural mechanisms rely heavily on animal model extrapolation.
Cited by
- supports The exercise pressor reflex stimulates sympathetic vasoconstrictor activity via signals transmitted from skeletal muscle to the brain through group III and group IV unmyelinated or lightly myelinated afferent nerve fibers.