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First published online December 3, 2004
Journal of Experimental Biology 207, 4615-4621 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.5913

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Lactate availability is not the major factor limiting muscle glycogen repletion during recovery from an intense sprint in previously active fasted rats

Ghazala Raja¹, Sally Mills¹, T. Norman Palmer² and Paul A. Fournier^1,*

¹ School of Human Movement and Exercise Science, University of Western Australia, Crawley, Western Australia, Australia, 6009
² Department of Biochemistry and Molecular Biology, James Cook University, Townsville, Queensland, Australia, 4811

View larger version (28K): [in a new window]   Fig. 1. Effect of a combination of moderate and high intensity exercise on muscle glycogen levels during and after exercise. Glycogen levels were determined as described in the Materials and methods. M and H refer to values found immediately following moderate and high intensity exercise, respectively. The values are shown as means ± S.E.M. (N=9). a–c above the bars indicate statistical differences: the same letter indicates no significant differences between the values; different letters indicate that the values differ significantly; no letter indicates that this value differs significantly from all others (ANOVA followed by Fisher PLSD a posteriori test; P<0.05).

View larger version (23K): [in a new window]   Fig. 2. Effect of a combination of moderate and high intensity exercise on muscle lactate levels during and after exercise. Lactate levels were determined as described in the Materials and methods. M and H refer to values found immediately following moderate and high intensity exercise, respectively. The values are shown as means ± S.E.M. (N=9). a,b above the bars indicate statistical differences: the same letter indicates no significant differences between the values; different letters indicate that the values differ significantly; no letter indicates that this value differs significantly from all others (ANOVA followed by Fisher PLSD a posteriori test; P<0.05).

View larger version (25K): [in a new window]   Fig. 3. Effect of a combination of moderate and high intensity exercise on muscle glucose 6-phosphate levels during and after exercise. Glucose 6-phosphate levels were determined as described in Materials and methods. M and H refer to values found immediately following moderate and high intensity exercise, respectively. The values are shown as means ± S.E.M. (N=9). The letter a above the bars indicates no significant differences between the values; no letter indicates that this value differs significantly from all others (ANOVA followed by Fisher PLSD a posteriori test; P<0.05).

View larger version (26K): [in a new window]   Fig. 4. Effect of a combination of moderate and high intensity exercise on the fractional velocity of glycogen synthase in muscles during and after exercise. Glycogen synthase fractional velocity is the percentage of the enzyme activity in the presence of low and high levels of its activator, glucose-6-phosphate. The fractional velocities of glycogen synthase were determined as described in Materials and methods. M and H refer to values found immediately following moderate and high intensity exercise, respectively. The values are shown as means ± S.E.M. (N=9). a–c above the points indicate statistical differences: the same letter indicates no significant differences between the values; different letters indicate that the values differ significantly; no letter indicates that this value differs significantly from all others (ANOVA followed by Fisher PLSD a posteriori test; P<0.05).