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- W203973011 abstract "We examined the net catabolism of two pools of glycogen, proglycogen (PG) and macroglycogen (MG), in human skeletal muscle during exercise. Male subjects ( n = 21) were assigned to one of three groups. Group 1 exercised 45 min at 70% maximal O 2 uptake (V˙o 2 max ) and had muscle biopsies at rest, 15 min, and 45 min. Group 2 exercised at 85%V˙o 2 max to exhaustion (45.4 ± 3.4 min) and had biopsies at rest, 10 min, and exhaustion. Group 3 performed three 3-min bouts of exercise at 100%V˙o 2 max separated by 6 min of rest. Biopsies were taken at rest and after each bout. Group 1 had small MG and PG net glycogenolysis rates (ranging from 3.8 ± 1.0 to 2.4 ± 0.6 mmol glucosyl units · kg −1 · min −1 ) that did not change over time. In group 2, the MG glycogenolysis rate remained low and unchanged over time, whereas the PG rate was initially elevated (11.3 ± 2.3 mmol glucosyl units · kg −1 · min −1 ) and declined ( P ≤ 0.05) with time. During the first 10 min, PG concentration ([PG]) declined ( P ≤ 0.05), whereas MG concentration ([MG]) did not. Similarly, in group 3, in both the first and the second bouts of exercise [PG] declined ( P ≤ 0.05) and [MG] did not, although by the end of the second exercise period the [MG] was lower ( P ≤ 0.05) than the rest level. The net catabolic rates for PG in the first two exercises were 22.6 ± 6.8 and 21.8 ± 8.2 mmol glucosyl units · kg −1 · min −1 , whereas the corresponding values for MG were 17.6 ± 6.0 and 10.8 ± 5.6. The MG pool appeared to be more resistant to mobilization, and, when activated, its catabolism was inhibited more rapidly than that of PG. This suggests that the metabolic regulation of the two pools must be different." @default.
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- W203973011 date "2001-03-01" @default.
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- W203973011 title "Pro- and macroglycogenolysis: relationship with exercise intensity and duration" @default.
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- W203973011 doi "https://doi.org/10.1152/jappl.2001.90.3.873" @default.
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