Document Detail


No difference in the lipolytic response to beta-adrenoceptor stimulation in situ but a delayed increase in adipose tissue blood flow in moderately obese compared with lean men in the postexercise period.
MedLine Citation:
PMID:  10831166     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study was undertaken to determine the effect of previous exercise on adipose tissue responsiveness to beta-adrenoceptor stimulation and on adipose tissue blood flow (ATBF). Eight lean and 8 obese men (body mass index [BMI], 23.6 +/- 2.1 [SD] v 29.0 +/- 1.9 kg x m(-2)) were investigated with abdominal subcutaneous microdialysis and 133Xe clearance. A stepwise isoprenaline infusion (10(-8), 10(-7), and 10(-6) mol x L(-1)) was administered in situ in the microdialysis catheter before and 2 hours after a submaximal exercise bout (90 minutes of cycling at 55% of maximal O2 uptake). No differences in the response (increase in interstitial glycerol v preinfusion level) to isoprenaline infusions were found between the 2 groups. In both groups, there was no difference in the response to postexercise versus preexercise infusion. When the vasodilating agent hydralazine (0.125 g x L(-1)) was infused into the microdialysis catheter to control for the vascular effects of isoprenaline, an interaction effect between exercise and isoprenaline dose was found. Analyses showed an attenuated response to the high isoprenaline dose after exercise (lean, 251 +/- 42 [SE] micromol x L(-1); obese, 288 +/- 77 micromol x L(-1)) versus before exercise (lean, 352 +/- 62 micromol x L(-1), P = .045 v after; obese, 380 +/- 94 micromol x L(-1), P = .021 v after), indicating a desensitization of lipolysis to beta-adrenoceptor stimulation. ATBF and arterial plasma glycerol increased after exercise in both groups, but the increase was delayed in obese subjects. Arterial plasma insulin was higher in the obese versus lean subjects at all times, and decreased during recovery in both groups. In conclusion, abdominal subcutaneous adipose tissue responsiveness to beta-stimulation is not enhanced postexercise in lean and obese men, whereas previous exercise increases ATBF. Furthermore, the data suggest slower lipid mobilization postexercise and resistance to the antilipolytic effect of insulin in the obese.
Authors:
E Børsheim; P Lönnroth; S Knardahl; P A Jansson
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Metabolism: clinical and experimental     Volume:  49     ISSN:  0026-0495     ISO Abbreviation:  Metab. Clin. Exp.     Publication Date:  2000 May 
Date Detail:
Created Date:  2000-06-08     Completed Date:  2000-06-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375267     Medline TA:  Metabolism     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  579-87     Citation Subset:  IM    
Affiliation:
Norwegian University of Sport and Physical Education, Oslo, Norway.
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MeSH Terms
Descriptor/Qualifier:
Adipose Tissue / blood supply*
Adult
Exercise*
Fatty Acids, Nonesterified / blood
Glycerol / blood
Heart Rate
Humans
Hydralazine / pharmacology
Insulin / blood
Isoproterenol / pharmacology
Lipolysis*
Male
Norepinephrine / blood
Obesity / metabolism*
Oxygen Consumption / drug effects
Propranolol / pharmacology
Receptors, Adrenergic, beta / physiology*
Regional Blood Flow / drug effects
Chemical
Reg. No./Substance:
0/Fatty Acids, Nonesterified; 0/Receptors, Adrenergic, beta; 11061-68-0/Insulin; 51-41-2/Norepinephrine; 525-66-6/Propranolol; 56-81-5/Glycerol; 7683-59-2/Isoproterenol; 86-54-4/Hydralazine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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