Table 2: Role of neurohumoral systems in beat-to-beat BPV in rats and humans.

Frequency domainRatsHumans

Very low frequency Myogenic vascular function, renin angiotensin system, endothelial-derived NO Myogenic vascular function

Low frequency Endothelial-derived NO, sympathetic nervous systemSympathetic nervous system, myogenic vascular function

High frequencyCardiac outputEndothelial-derived NO

NO: nitric oxide.