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• W2034338114 abstract "Amylin is a pancreatic b-cell peptide that facilitates the regulation of blood glucose concentrations by inhibiting release of glucagon and modulating gastric emptying. No studies have investigated the effects of prolonged exercise on amylin. PURPOSE: To determine the effects of 90 min of treadmill exercise on amylin and other glucoregulatory hormone responses. METHODS: Eight young, healthy males (22.6 ± 1.5y) completed a preliminary trial followed by an experimental trial and a control trial one month apart. Descriptive data including assessment of VO2max and body composition were determined in the preliminary trial. The experimental trial began 2.5h after consumption of a standard nutrient beverage and consisted of treadmill exercise at 60% of VO2max for 90 minutes. Blood samples were collected beginning at 9:00am before (-30 and 0 min), during (18, 36, 54, 72, & 90min), and following exercise (20, 40, & 60min). For control conditions, blood samples were collected in a resting trial at the same time points as the experimental trial. Experimental and control trials were counterbalanced. Plasma was analyzed for amylin, glucagon, cortisol, glucose, and lactate concentrations. RESULTS: Plasma glucose concentrations remained stable (∼100 mg/dL) across exercise trials whereas lactate levels significantly increased to peak at 3.24 mM after the first 18 min of exercise then steadily declined. Amylin values significantly declined from 7.25 ± 2.03 pM at time 0 to 2.71 ± 0.69 pM immediately following exercise, although the decline was not significantly different from a smaller decline in the control trial. Although glucagon concentrations increased from 64.29 ± 3.16 to 85.29 ± 8.19 pg/mL, there was not a significant trial difference detected by ANOVA However, area-under-the-curve (total) glucagon concentrations were significantly higher in the exercise trial than the control trial. There was a significant time effect and trial effect for cortisol concentrations which steadily declined from rest [14.41 ± 2.31 μg/dL] to 54 min of exercise [9.61 ± 1.23 μg/dL], then increased to peak at 15.17 ± 2.08 μg/dL after 20 min of recovery. CONCLUSIONS: Reductions in circulating amylin concentrations are associated with increases in glucagon and cortisol during prolonged exercise in which blood glucose concentrations remain stable." @default.
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• W2034338114 date "2010-05-01" @default.
• W2034338114 modified "2023-09-27" @default.
• W2034338114 title "Alterations in Amylin and Glucagon During Prolonged Exercise" @default.
• W2034338114 doi "https://doi.org/10.1249/01.mss.0000385986.19996.d1" @default.
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