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. 1993 Jul;36(1):25–30. doi: 10.1111/j.1365-2125.1993.tb05887.x

Effects of physiological and pharmacological variation of sympathetic nervous system activity on plasma non-esterified fatty acid concentrations in man.

P Barbe 1, J Galitzky 1, D Riviere 1, J M Senard 1, M Lafontan 1, M Garrigues 1, M Berlan 1
PMCID: PMC1364550  PMID: 8373709

Abstract

1. The consequence of the sympatholytic effect of clonidine (alpha 2-adrenoceptor agonist) was compared with the effect of a physiological inhibition of sympathetic nervous system activity (change from upright to supine position) on plasma catecholamine and non-esterified fatty acid (NEFA) concentrations in overnight fasting healthy men. 2. Clonidine (150 micrograms orally) administered in upright position induced a significant reduction of plasma noradrenaline and NEFA concentrations. A change from upright to supine position which provoked a more marked decrease in plasma noradrenaline concentrations induced a weak increase in plasma NEFA concentrations. 3. The modification of plasma NEFA and catecholamine concentrations brought about by standing up was studied after placebo or yohimbine (alpha 2-adrenoceptor antagonist) administration. With placebo, standing up promotes a 100% increase in plasma noradrenaline concentrations (measured 5 and 15 min after rising) and a weak transient decrease in plasma NEFA concentrations (5 min after rising). In the supine position, yohimbine increased plasma noradrenaline and NEFA concentrations by about 100% and 55% respectively. Standing after yohimbine administration promoted large increases in plasma noradrenaline and NEFA concentrations. 4. These results indicate that a reduction of sympathetic nervous activity is not associated with a decrease of plasma NEFA concentrations and argue for a role of alpha 2-adrenoceptors in the NEFA mobilization from adipose tissue after sympathetic nervous system activation in man.

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Selected References

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