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Erschienen in: European Journal of Applied Physiology 5-6/2005

01.03.2005 | Original Article

Effect of a high-altitude expedition to a Himalayan peak (Pumori, 7,161 m) on plasma and erythrocyte antioxidant profile

verfasst von: José Magalhães, António Ascensão, Franklim Marques, José M. C. Soares, Rita Ferreira, Maria J. Neuparth, José A. Duarte

Erschienen in: European Journal of Applied Physiology | Ausgabe 5-6/2005

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Abstract

The effects of a high-altitude exposure were studied in six mountaineers who spent 3 weeks at an altitude range between 5,250 and 7,161 m after 1 week in an acclimatization trek (2,800–5,250 m). Blood drawn from the antecubital vein was collected at sea level 1 day before and 1 day after the expedition to analyse some haematological variables [haemoglobin (Hb), haematocrit (Htc) and red blood cell (RBC) count], erythrocyte antioxidant enzyme activity [superoxide dismutase (SOD), glutathione peroxidase (GPx) and glutathione reductase (Gr)] and membrane fatty acid profile [mono-unsaturated fatty acids (MUFA), polyunsaturated fatty acids (PUFA), saturated fatty acids (SFA), trans fatty acids (TRANS)]. Moreover, total antioxidant status (TAS), thiobarbituric acid reactive substances (TBARS), thiol protein groups (SH), SOD, GPx and Gr were measured in plasma. High-altitude exposure induced polycythaemia, with significant increases in RBC count (5.26%), Hb concentration (4.83%) and Htc (6.26%). Furthermore, a significant increase in plasma TBARS, SOD and Gr was observed after the expedition, whereas SH, TAS and GPx decreased. Erythrocyte glutathione-cycle-related antioxidant enzyme activity was upregulated, whereas SOD activity was maintained after the expedition. In addition, despite the unchanged (MUFA+PUFA)/SFA ratio, the membrane erythrocyte fatty acid content showed a significant increase in PUFAs and a decrease in TRANS, suggesting enhanced membrane fluidity. In conclusion, it seems that high-altitude exposure, besides quantitative variations in RBC expression, induced plasma oxidative stress and damage, and significant changes in erythrocyte components, namely in antioxidant enzyme activity and membrane fatty acid profile that might modify RBC functionality.
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Metadaten
Titel
Effect of a high-altitude expedition to a Himalayan peak (Pumori, 7,161 m) on plasma and erythrocyte antioxidant profile
verfasst von
José Magalhães
António Ascensão
Franklim Marques
José M. C. Soares
Rita Ferreira
Maria J. Neuparth
José A. Duarte
Publikationsdatum
01.03.2005
Verlag
Springer-Verlag
Erschienen in
European Journal of Applied Physiology / Ausgabe 5-6/2005
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-004-1222-2

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