Effects of exercise and time elapsed after exercise on V02, VC02 and R responses to norepinephrine in rats

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Deutscher übersetzter Titel:Die Wirkungen von körperlicher Belastung und Zeitablauf nach der Belastung auf Sauerstoffaufnahme, Kohlendioxydabgabe und Gasaustauschreaktion nach Noradrenalininjektion bei Ratten
Autor:Thibault, M.C.; Vallieres, J.
Erschienen in:European journal of applied physiology
Veröffentlicht:48 (1982), 2, S. 215-225, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:1439-6319, 0301-5548
DOI:10.1007/BF00422983
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Erfassungsnummer:PU198203015971
Quelle:BISp

Abstract des Autors

The effects of norepinephrine (NE) injection (200 microg/kg of body weight) on oxygen consumption (V02), carbon dioxide production (VC02) and respiratory exchange ratio (R) were investigated in female rats after 1 h of running on a treadmill (21.5 m/min) at 10 inclination. Six groups of animals were injected respectiveliy at various times after the exercise (1, 3, 6, 9, 21, and 47 h), and were compared to six non-exercised groups injected at correspondingtimes. V02 and VC02 were monitored continuously during the 20 min preceding injection and for the 60 min following it. The increases in V02 and VC02, and the decrease in R were of similar magnitude in both exercised and non-exercised rats (about 30 and 20 for V02 and VC02, respectively, and -12 for R). Peak V02 and R values attained after NE injection varied however with time of injection, specially in exercised animals 1 and 9 h after the run. Exercise significantly delayed time of response to NE for V02 and VC02 particularly 1 and 9 h after the running bout. It is concluded that time of day, exercise, and time elapsed after exercise are important factors to consider when studying metabolic responses to catecholamines. Furthermore, it is suggested that such experimental controls might be meaningful in human studies as well.