Effects of treadmill exercise protocol with constant and ascending grade on levelling-off O2 uptake and VO2max

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Bibliographische Detailangaben
Deutscher übersetzter Titel:Auswirkung von Laufbandergometerprotokollen mit konstanter bzw. ansteigender Laufbandneigung auf die Abflachung der Sauerstoffaufnahme und die maximale Sauerstoffaufnahme
Autor:Pokan, R.; Schwaberger, G.; Hofmann, P.; Eber, B.; Toplak, H.; Gasser, R.; Fruhwald, F.M.; Pessenhofer, H.; Klein, W.
Erschienen in:International journal of sports medicine
Veröffentlicht:16 (1995), 4, S. 238-242, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:0172-4622, 1439-3964
DOI:10.1055/s-2007-972998
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Erfassungsnummer:PU199510103287
Quelle:BISp

Abstract des Autors

In order to investigate the effect of an exercise protocol on the levelling-off O2 uptake and VO2max values, ten male subjects aged 28+/-5 yrs, height 1.8+/-0.05 m, body mass 76+/-6 kg performed two treadmill exercise protocols: 1) constant grade (CG) of 5%, with increasing running speed starting at 6 km/h and increments of 2 km/h every 3 minutes; 2) ascending grade (AG) starting at 0% and increments of 5% every 3 minutes, with constant running speed of 5 km/h. During each protocol oxygen uptake (VO2), pulmonary ventilation (VE), tidal volume (VT), and breathing rate (BR) as well as blood lactate concentration (La) and heart rate (HR) were measured. In CG a levelling-off phenomenon of VO2 in all cases was observed. Aerobic capacity expressed as VO2max in CG was 46.2+/-6.0 ml/min/kg. In contrast, VO2max was 35% higher in AG (62.6+/-7.2 ml/min/kg). The behaviour of VO2 indicates a lower efficiency with increasing work load in AG as compared to CG. Regarding maximum performance it can be concluded that VO2 in CG seems to be limited by a mechanical or neuromuscular constraint on the depth of breathing, which is confirmed by a distinct flattening of VT. The levelling-off of the VO2 in CG, something which is not observed in AG, can be explained plausibly this way. Verf.-Referat