Influence of contraction frequency on cardiovascular responses during the upper and lower body exercise
Deutscher übersetzter Titel: | Der Einfluss der Kontraktionshäufigkeiten auf kardiovaskuläre Reaktionen bei Bewegungen des Ober- und Unterkörpers |
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Autor: | Kang, Jie; Walker, Heather; Hebert, Mark; Wendell, Michael; Hoffman, Jay R. |
Erschienen in: | Research in sports medicine |
Veröffentlicht: | 12 (2004), 4, S. 251-264, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 1543-8627, 1543-8635 |
DOI: | 10.1080/15438620490887014 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU200508001922 |
Quelle: | BISp |
Abstract des Autors
This study examined the relation between pedal frequency and cardiovascular responses during arm (AE) and leg (LE) ergometry. Twenty-six subjects completed three experimental sessions. Each session consisted of 10 min of steady-state exercise on AE or LE at 40, 60, or 80 rev·min-1. Oxygen uptake (VO2) and cardiac output (Q) were measured during each exercise. Arteriovenous oxygen difference (a-vO2diff) was calculated by dividing VO2 by Q. VO2 was greater at 80 than at either 40 or 60 rev·min-1 during both AE and LE. Q was greater at 60 than 40 rev·min-1 during AE and at 80 than 40 rev·min-1 during LE. a-vO2diff was greater at 80 than 40 or 60 rev·min-1 during AE, but remained unchanged during LE. It appears that the greater VO2 at 80 rev·min-1 during AE is due to an increase in peripheral O2 extraction. However, an enhanced systemic circulation may be the principal cause for the greater VO2 seen at 80 rev·min-1 during LE. Verf.-Referat