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Muscle metabolic, enzymatic and transporter responses to a session of prolonged cycling

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Abstract

A single session of prolonged work was employed to investigate changes in selected metabolic, transporter and enzymatic properties in muscle. Ten active but untrained volunteers (weight = 73.9 ± 4.2 kg) with a peak aerobic power \( \left( {\dot{V}{\text{O}}_{{2{\text{peak}}}} } \right) \) of 2.95 ± 0.27 l min−1, cycled for 2 h at 62 ± 1.3% \( \left( {\dot{V}{\text{O}}_{{2{\text{peak}}}} } \right) \) Tissue extraction from the vastus lateralis occurred prior to (E1-Pre) and following (E1-Post) exercise and on 3 consecutive days of recovery (R1, R2, R3). The exercise resulted in decreases (P < 0.05) in ATP (−9.3%) and creatine phosphate (−49%) and increases in lactate (+100%), calculated free ADP (+253%) and free AMP (+1,207%), all of which recovered to E1-Pre by R1. Glycogen concentration, which was depressed (P < 0.05) by 75% at E1-Post, did not recover until R3. Compared to E1-Pre, the cycling also resulted in decreases (P < 0.05) in the activities of cytochrome c oxidase, phosphorylase, and hexokinase but not in citrate synthase (CS) or 3-hydroxy-CoA dehydrogenase at E1-Post. With the exception of CS, which was elevated (P < 0.05) at R3, all enzyme activities were not different from E1-Pre during recovery. For the glucose (GLUT1, GLUT4) and monocarboxylate (MCT1, MCT4) transporters, changes in expression levels (P < 0.05) were only observed for GLUT1 at R1 (+42%) and R3 (+33%). It is concluded that the metabolic stress produced by prolonged exercise is reversed by 1 day of recovery. One day of exercise also resulted in a potential upregulation in the citric acid cycle and glucose transport capabilities, adaptations which are expressed at variable recovery durations.

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Acknowledgments

We acknowledge the financial support provided by the Natural Science and Engineering Research Council (Canada) for the research (to H. Green).

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Correspondence to H. J. Green.

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Communicated by Susan Ward.

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Green, H.J., Duhamel, T.A., Smith, I.C. et al. Muscle metabolic, enzymatic and transporter responses to a session of prolonged cycling. Eur J Appl Physiol 111, 827–837 (2011). https://doi.org/10.1007/s00421-010-1709-y

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