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- W2413893966 abstract "The present studies were designed to verify whether preventing the rise in serum levels of nonesterified fatty acids (NEFA) by adrenergic blockade would interfere with the decrease in tissue lipoprotein lipase (LPL) activity caused by acute exercise in rats. Ninety minutes before being killed, male rats were injected intraperitoneally with either saline, the beta-adrenergic blocker propranolol (25 mg/kg body weight), or the alpha 2-adrenergic blocker yohimbine (3 mg/kg body weight). Half of each group was killed at rest and the other half immediately after a 1-h run on a treadmill. LPL was determined in white adipose tissue (WAT), heart, and red vastus lateralis muscle (VLM). Exercise enhanced serum levels of NEFA 50% over resting values in saline-injected rats. The latter increase was totally abolished in animals having received propranolol or yohimbine. The activity of LPL in WAT, heart, and red VLM was approximately 35% lower in exercised rats than in resting animals. Serum triacylglycerols were also reduced by the run. Neither propranolol nor yohimbine interfered with any of these reductions. Exercise did not change serum glucose levels in saline-injected rats but decreased it in those injected with propranolol or yohimbine. Serum insulin was unchanged by exercise and by the antagonists. These findings suggest that the beta- and alpha 2-adrenergic pathways, as well as the exercise-induced rise in serum levels of NEFA, are not responsible for the early reducing effect of a 1-h run on tissue LPL activity in untrained rats.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2413893966 date "1992-04-01" @default.
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- W2413893966 title "Serum free fatty acids are not involved in acute exercise-induced reduction of LPL in rat tissues" @default.
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- W2413893966 doi "https://doi.org/10.1152/ajpendo.1992.262.4.e377" @default.
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