...Anthony J. Ocon; Zachary R. Messer; Marvin S. Medow; Julian M. Stewart CFS (chronic fatigue syndrome) is commonly co-morbid with POTS (postural tachycardia syndrome). Individuals with CFS/POTS experience unrelenting fatigue, tachycardia during orthostatic stress and ill-defined neurocognitive...

... groups in supine position with free and with controlled breathing, and during orthostatic stress. Temporal and spectral HRV indices were obtained from the ECG signal processing. The main results showed that, in supine position with free and controlled breathing, the HF (high-frequency) spectral component...

... subjects at rest, during maximal treadmill exercise ( n =8) and during decreases caused by orthostatic stress ( n =8). Comparison with a rebreathing method indicated that Portapres® tended to overestimate cardiac output. The random errors of the estimates (precision), expressed as ±2 S.D...

...V.L. COOPER; R. HAINSWORTH During orthostatic stress, an increase in peripheral vascular resistance normally results in arterial blood pressure being well maintained, despite a decrease in cardiac output. The present study was undertaken to determine whether the sensitivity of the carotid...

... PROPRANOLOL ON RENIN SECRETION STIMULATED BY ORTHOSTATIC STRESS J. A. TOBERT, J . D. H. SLATER, F. FOGELMAN, S . L. LIGHTMAN, A. B. K U R T Z AND N. N . P A Y N E The Institute of Clinical Research, The Middlesex Hospital, London (Received 26 September 1972) SUMMARY 1. The time-course of the rise in plasma...