Beta-adrenergic blockade does not prevent polycythemia or decrease in plasma volume in men at 4300 m altitude

European Journal of Applied Physiology and Occupational Physiology
R F GroverJ E Greenleaf

Abstract

When humans ascend to high altitude (ALT) their plasma volume (PV) and total blood volume (BV) decrease during the first few days. With continued residence over several weeks, the hypoxia-induced stimulation of erythropoietin increases red cell production which tends to restore BV. Because hypoxia also activates the beta-adrenergic system, which stimulates red blood cell production, we investigated the effect of adrenergic beta-receptor inhibition with propranolol on fluid volumes and the polycythemic response in 11 healthy unacclimatized men (21-33 years old exposed to an ALT of 4300 m (barometric pressure 460 Torr) for 3 weeks on Pikes Peak, Colorado. PV was determined by the Evans blue dye method (PVEB), BV by the carbon monoxide method (BVCO), red cell volume (RCV) was calculated from hematocrit (Hct) and BVCO, and serum erythropoietin concentration ([EPO]) and reticulocyte count, were also determined. All determinations were made at sea level and after 9-11 (ALT-10) and 19-20 (ALT-20) days at ALT. At sea level and ALT, six men received propranolol (pro, 240 mg x day[-1]), and five received a placebo (pla). Effective beta-blockade did not modify the mean (SE) maximal values of [EPO] [pla: 24.9 (3.5) vs pro: 24.5 (1.5) mU x ...Continue Reading

Citations

Mar 7, 2002·Lancet·Raul PlataUNKNOWN Commission on Global Advancement of Nephrology (COMGAN), Research Subcommittee of the International Society of Nephrology
Dec 7, 2013·British Journal of Sports Medicine·Christopher J GoreWalter F Schmidt
May 7, 2013·Proceedings of the National Academy of Sciences of the United States of America·Esther A SolymosiWolfgang M Kuebler
Jun 13, 2009·High Altitude Medicine & Biology·Philo U SaundersChristopher J Gore
Jun 21, 2007·Respiratory Physiology & Neurobiology·María Rivera-ChLuis Huicho
Jun 25, 2005·Journal of Applied Physiology·Christopher J GoreCaroline M Burge
Jun 3, 2017·Journal of Applied Physiology·Christoph SiebenmannCarsten Lundby
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