HEART RATE VARIABILITY POWER SPECTRA IN NORMAL SUBJECTS AND IN PATIENTS WITH CARDIAC DYSFUNCTION.

The power spectrum of heart rate variability (HRVPS) in humans has two major peaks; a 0. 1-Hz peak due to baroreflex control and a respiratory peak (0. 25-0. 35 Hz). Results are presented of investigations of normal subjects during the resting state, regulated breathing, standing, and during and following steady-state exercise. HRVPS results are also given for patients with autonomic neuropathy, following orthotopic cardiac transplantation, and …