Journal of Applied Physiology AJP: Lung Cellular and Molecular Physiology
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J Appl Physiol 76: 1068-1072, 1994;
8750-7587/94 $5.00
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Journal of Applied Physiology, Vol 76, Issue 3 1068-1072, Copyright © 1994 by American Physiological Society

ARTICLES

Time course of erythropoietin, triiodothyronine, thyroxine, and thyroid-stimulating hormone at 2,315 m

H. C. Gunga, K. Kirsch, L. Rocker and W. Schobersberger
Physiologisches Institut, Freie Universitat Berlin, Germany.

Erythropoietin (EPO), triiodothyronine, thyroxine, thyroid-stimulating hormone (TSH), hemoglobin (Hb), reticulocytes, packed cell volume, and plasma volume changes were studied in 29 male Austrian mountain rescue soldiers before and several days after an ascent from 744 to 2,315 m in the Alps. EPO concentrations showed a remarkable increase 48 h after the ascent (P < 0.01). No significant changes were found in triiodothyronine, thyroxine, and TSH. Reticulocytes increased only slightly. Hb decreased during the week (P < 0.01). Packed cell volume did not change, whereas plasma volume showed a slight decrease for 48 h after the ascent but then increased constantly (P < 0.01). It seems that thyroid hormones, TSH, and Hb play only a minor role in the regulation of EPO production and release under mild hypobaric-hypoxic conditions (2,315 m).


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