Influence of fiber type composition and capillary density on onset of blood lactate accumulation
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| Deutscher übersetzter Titel: | Einfluss von Fasertypverteilung und Kapillarendichte auf den Beginn des Blutlaktatanstiegs |
|---|---|
| Autor: | Tesch, P.A.; Sharp, D.S.; Daniels, W.L. |
| Erschienen in: | International journal of sports medicine |
| Veröffentlicht: | 2 (1981), 4, S. 252-255, Lit. |
| Format: | Literatur (SPOLIT) |
| Publikationstyp: | Zeitschriftenartikel |
| Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
| Sprache: | Englisch |
| ISSN: | 0172-4622, 1439-3964 |
| DOI: | 10.1055/s-2008-1034619 |
| Schlagworte: | |
| Online Zugang: | |
| Erfassungsnummer: | PU198203015908 |
| Quelle: | BISp |
Abstract
Onset of blood lactate accumulation (OBLA) was determined in 16 healthy and physically active men (23-33 yrs) during cycling using a continuous stepwise increased exercise intensity protocol. OBLA was defined as the exercise inten-sity corresponding to a lactate concentration of 4 mmoll blood. Oxygen consumption, pulmonary ventilation, respiratory quotient (R), heart rate, and lactate concentration were monitored during each exercise intensity. Muscle biopsies were obtained from m. vastus lateralis at rest for determination of fiber type composition and capillary density. Calculated values (mean +- SD) for exercise intensity, oxygen consumption and ventilation at OBLA were 159 (+- 37) W, 2.43 (+- 0.47) lmin, and 49.8 (+- 10.5) lmin or 65 (+- 10) of VO2max. OBLA ( VO2max) was found to correlate significantly (r = 0.75) to the relative muscle area occupied by ST (type I) fibers. Furthermore, 92 of the variance in OBLA could be explained by ST area + capillary density. It is suggested that both inherent and adaptative qualities of the exercising muscle are of significance for the onset of blood lactate accumulation. Verf.-Referat