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- W2264652246 abstract "Muscle contraction in vitro increases glucose uptake (GU), independent of insulin, but in vivo, the exercise-induced increase in GU is impaired in insulin-deficient diabetic dogs. We wished to determine whether, in vivo, suppression of the free fatty acid (FFA)-glucose cycle with methylpalmoxirate (MP, inhibitor of FFA oxidation) alone or combined with propranolol (PRO, beta-blocker) could improve GU during exercise in the absence of insulin. We performed four groups of exercise experiments (6 km/h, 10% slope) in depancreatized insulin-deprived dogs: 1) control (n = 6); 2) MP treated (5 oral doses of 10 mg/kg, twice daily, n = 6); 3) treated with MP+octanoate (OCT; oxidation unaffected by MP, 27 mumol.kg-1.min-1 iv during exercise; n = 5); and 4) MP+PRO treated (5 micrograms.kg-1.min-1 iv during exercise, n = 6). MP abolished ketosis (inhibition of hepatic FFA oxidation), decreased basal glucose production (GP), and increased metabolic clearance of glucose (MCR). During exercise, MP attenuated the increment in GP (P < 0.01), which was reversed by OCT. MP did not affect the exercise-induced increase in GU and MCR. With MP+PRO, FFAs decreased and lactate did not rise during exercise. GP was not further suppressed, but GU and MCR were increased (P < 0.01) to 89 and 31% of normal, respectively. In insulin-deprived depancreatized dogs, glucose cycling was increased to a greater extent than GP, as in type II diabetes. By the end of exercise, glucose cycling increased (P < 0.05), but to a similar extent as GP.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2264652246 date "1992-10-01" @default.
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- W2264652246 title "Role of FFA-glucose cycle in glucoregulation during exercise in total absence of insulin" @default.
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- W2264652246 doi "https://doi.org/10.1152/ajpendo.1992.263.4.e646" @default.
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