Abstract
To identify factors that influence post-exercise muscle glycogen repletion, we compared the glycogen recovery after level running with downhill running, an experimental model of impaired post-exercise glycogen recovery. Male Institute of Cancer Research (ICR) mice performed endurance level running (no inclination) or downhill running (−5° inclination) on a treadmill. In Experiment 1, to determine whether these two types of exercise resulted in different post-exercise glycogen repletion patterns, tissues were harvested immediately post-exercise or 2 days post-exercise. Compared to the control (sedentary) group, level running induced significant glycogen supercompensation in the soleus muscle at 2 days post-exercise (p = 0.002). Downhill running did not induce glycogen supercompensation. In Experiment 2, mice were orally administered glucose 1 day post-exercise; this induced glycogen supercompensation in soleus and plantaris muscle only in the level running group (soleus: p = 0.005, plantaris: p = 0.003). There were significant positive main effects of level running compared to downhill running on the plasma insulin (p = 0.017) and C-peptide concentration (p = 0.011). There was no difference in the glucose transporter 4 level or the phosphorylated states of proteins related to insulin signaling and metabolism in skeletal muscle. The level running group showed significantly higher hexokinase 2 (HK2) protein content in both soleus (p = 0.046) and plantaris muscles (p =0.044) at 1 day after exercise compared to the downhill running group. Our findings suggest that post-exercise skeletal muscle glycogen repletion might be partly influenced by plasma insulin and skeletal muscle HK2 protein levels.
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This research was financially supported by Grant-in-Aid for Young Scientists (18K17853) from the Japan Society for the Promotion of Science.
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Conceptualization, YT, JS, and HH; data curation, YT, JS, JY, YM, MB, RS, and TS; formal analysis, YT, JS, and JY; data interpretation; YT, JS, YM, YN, and HH; writing—original draft preparation, YT, JS, and HH. All authors reviewed and then approved the final version of the manuscript. The authors declare that all data were generated in-house and that no paper mill was used.
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All procedures involving animals were conducted in accordance with the ethical standards of the Committee on Animal Care and Use, The University of Tokyo; all experimental protocols were approved by this committee (approval no. 24-4).
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Key Points
• We compared two running models to find factors stimulating glycogen recovery.
• Greater glycogen recovery was collateral with higher muscle HK2 and plasma insulin.
• Greater glycogen recovery was not accompanied with activated insulin signaling.
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Takahashi, Y., Sarkar, J., Yamada, J. et al. Enhanced skeletal muscle glycogen repletion after endurance exercise is associated with higher plasma insulin and skeletal muscle hexokinase 2 protein levels in mice: comparison of level running and downhill running model. J Physiol Biochem 77, 469–480 (2021). https://doi.org/10.1007/s13105-021-00806-z
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DOI: https://doi.org/10.1007/s13105-021-00806-z