Skip to main content

Effect of -adrenoceptor stimulation on oxygen consumption and triglyceride/fatty acid cycling after exercise

Buy Article:

$48.00 plus tax (Refund Policy)


The purpose of this study was to characterize the effects of prolonged β-adrenoceptor stimulation on O2 uptake and triglyceride/fatty acid (TG/FA) cycling during rest with and without previous exercise. Eight men performed two exercise (90 min cycling at 56 ± 3 (SD)% of maximal O2 uptake, followed by 4.5 h bed rest) and two rest-control experiments. In one rest and one exercise experiment a bolus dose (5 g) of the β-adrenoceptor agonist isoprenaline was given immediately after exercise, followed by a continuous infusion (20 ng kg–1 min–1), and at the corresponding time in the rest experiment. In the other experiments saline was given instead. The O2 uptake increased in the post-exercise period both with and without β-stimulation. The total excess post-exercise oxygen consumption (EPOC) was not different between saline (8.1 ± 1.8 (SE) L) and isoprenaline administration (10.8 ± 1.8 L, P = 0.40). Also, the total accumulated increase in O2 uptake for the 4.5 h period after isoprenaline infusion was not different between the rest (12.5 ± 2.0 L) and the exercise experiments (15.2 ± 1.7 L, P = 0.40). The rate of TG/FA cycling increased after both exercise and isoprenaline treatment, but no interaction effect was found. In conclusion, the increases observed in O2 uptake and the rate of TG/FA cycling during β-adrenoceptor stimulation were not increased by a previous exercise bout.

Keywords: TG/FA cycle; excess post-exercise O2 consumption; hormones; β-adrenoceptor sensitivity

Document Type: Original Article


Affiliations: 1: The Norwegian University of Sport and Physical Education, Oslo, Norway 2: Department of Physiology, National Institute of Occupational Health, Oslo, Norway

Publication date: October 1, 1998


Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more