Improved running economy and increased hemoglobin mass in elite runners after extended moderate altitude exposure

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Deutscher übersetzter Titel:Verbesserte Laufökonomie und erhöhte Hämoglobinmenge bei Profiläufern nach einem längeren Aufenthalt in moderater Höhe
Autor:Saunders, P.U.; Telford, R.D.; Pyne, D.B.; Hahn, A.G.; Gore, C.J.
Erschienen in:Journal of science and medicine in sport
Veröffentlicht:12 (2009), 1, S. 67-72, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:1440-2440, 1878-1861
DOI:10.1016/j.jsams.2007.08.014
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Erfassungsnummer:PU201001000858
Quelle:BISp

Abstract des Autors

There is conflicting evidence whether hypoxia improves running economy (RE), maximal O2 uptake (VO2max), haemoglobin mass (Hbmass) and performance, and what total accumulated dose is necessary for effective adaptation. The aim of this study was to determine the effect of an extended hypoxic exposure on these physiological and performance measures. Nine elite middle distance runners were randomly assigned to a live high–train low simulated altitude group (ALT) and spent 46 ± 8 nights (mean ± S.D.) at 2860 ± 41 m. A matched control group (CON, n = 9) lived and trained near sea level (~600 m). ALT decreased submaximal (L min−1) (−3.2%, 90% confidence intervals, −1.0% to −5.2%, p = 0.02), increased Hbmass (4.9%, 2.3–7.6%, p = 0.01), decreased submaximal heart rate (−3.1%, −1.8% to −4.4%, p = 0.00) and had a trivial increase in VO2max (1.5%, −1.6 to 4.8; p = 0.41) compared with CON. There was a trivial correlation between change in Hbmass and change in VO2max (r = 0.04, p = 0.93). Hypoxic exposure of ~400 h was sufficient to improve Hbmass, a response not observed with shorter exposures. Although total O2 carrying capacity was improved, the mechanism(s) to explain the lack of proportionate increase in VO2max were not identified. Verf.-Referat