Influence of a 36-h fast on the central and peripheral components of VO2 during submaximal exercise and peak oxygen uptake
Deutscher übersetzter Titel: | Einfluss eines 36stuendigen Fastens auf die zentralen und peripheren Komponenten der Sauerstoffaufnahme bei submaximaler Belastung und auf die maximale Sauerstoffaufnahme |
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Autor: | Boone, William T.; Boone, William Thomas |
Erschienen in: | Journal of sports sciences |
Veröffentlicht: | 13 (1995), 4, S. 279-282, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0264-0414, 1466-447X |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199511103611 |
Quelle: | BISp |
Abstract des Autors
To determine if a 36-h fast affects the central and peripheral components of VO2 during submaximal exercise and peak oxygen uptake (VO2, peak), 10 physically healthy males exercised first for 10 min at ca. 60% oftheir VO2 peak and then to fatigue. Their cardiovascular responses were compared with those of 10 physically healthy controls (males) who were individually matched by VO2 peak values. Fasting had no significant effect on the central (heart rate, HR; stroke volume, SV; cardiac output, Q) and peripheral (arteriovenous oxygen content difference, a-vO2 diff.) components of VO2 during submaximal exercise. The respiratory exchange ratio (RER) during submaximal exercise was significantly decreased in the fasted subjects. Based on the RER, fasting altered substrate utilization of the muscle and thereby increased the contribution of fat during submaximal exercise. Fasting had no significant effect on VO2 peak, HR or O2 pulse, but RER was significantly lower during incremental exercise to fatigue. These results demonstrate that VO2 during submaximal exercise in fasted subjects is achieved by similar central and peripheral responses as found in non-fasted subjects, and that fasting does not reduce VO2 peak. Verf.-Referat