VO2 responses to running speeds above VO2max
Deutscher übersetzter Titel: | Reaktion der Sauerstoffaufnahme bei Laufgeschwindigkeiten über der maximalen Sauerstoffaufnahme |
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Autor: | Duffield, R.; Bishop, D. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 29 (2008), 6, S. 494-499, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2007-989230 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU200809002852 |
Quelle: | BISp |
Abstract
This study compared VO2, heart rate (HR) and electromyographic (iEMG) responses to speeds above the velocity associated with VO2max (v-VO2max). Eight male, middle-distance runners performed a graded exercise test to determine VO2max and v-VO2max and runs to fatigue at 100% and 110% v-VO2max. Breath-by-breath VO2 and HR were continuously recorded; lactate [La-] measured pre- and post-run and iEMG measures of rectus femoris (RF) and vastus lateralis were recorded during the first and last 20 s of each run. Analysis indicated longer time to fatigue in the 100% v-VO2max run with no differences between conditions for VO2 or HR amplitudes or post-run [La-] (p>0.05). There were significantly faster tau values (p<0.05) in the 110% condition in VO2 and HR. No significant correlations were observed between VO2 or HR tau values and time to fatigue. RF iEMG was significantly larger in 110% compared to 100% run in the first 20s (p<0.05). While no association between treadmill performance and VO2 response was evident, faster running speeds resulted in faster VO2 and HR responses, with no difference in amplitude or % VO2max attained. This may potentially be as a result of an increased muscle fibre recruitment stimulus during the faster running velocity resulting in faster cardiodynamic responses. Verf.-Referat