Epinephrine increases glucose uptake of adipose tissue incubated in vitro. This effect is common to both insulin and epinephrine. However, epinephrine increases and insulin decreases release of free fatty acids. It would appear that the effect of epinephrine on mobilization of free fatty acids is not mediated by a decrease in carbohydrate availability, but possibly by increased rate of glyceride breakdown.
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Flinn et al. (1959) studied this question.