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Hokkaido University Collection of Scholarly and Academic Papers >
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Effects of hyperbaric environment on endurance and metabolism are exposure time-dependent in well-trained mice
| Title: | Effects of hyperbaric environment on endurance and metabolism are exposure time-dependent in well-trained mice |
| Authors: | Suzuki, Junichi Browse this author →KAKEN DB |
| Keywords: | bayesian data analysis | | hybrid exercise | | hyperbaric exposure | | left ventricle | | NT-PGC1 alpha | | skeletal muscle |
| Issue Date: | Mar-2021 |
| Publisher: | John Wiley & Sons |
| Journal Title: | Physiological reports |
| Volume: | 9 |
| Issue: | 5 |
| Start Page: | e14780 |
| Publisher DOI: | 10.14814/phy2.14780 |
| Abstract: | Hyperbaric exposure (1.3 atmospheres absolute with 20.9% O-2) for 1 h a day was shown to improve exercise capacity. The present study was designed to reveal whether the daily exposure time affects exercise performance and metabolism in skeletal and cardiac muscles. Male mice in the training group were housed in a cage with a wheel activity device for 7 weeks from 5 weeks old. Trained mice were then subjected to hybrid training (HT, endurance exercise for 30 min followed by sprint interval exercise for 30 min). Hyperbaric exposure was applied following daily HT for 15 min (15HT), 30 min (30HT), or 60 min (60HT) for 4 weeks. In the endurance capacity test, maximal work values were significantly increased by 30HT and 60HT. In the left ventricle (LV), activity levels of 3-hydroxyacyl-CoA-dehydrogenase, citrate synthase, and carnitine palmitoyl transferase (CPT) 2 were significantly increased by 60HT. CPT2 activity levels were markedly increased by hyperbaric exposure in red gastrocnemius (Gr) and plantaris muscle (PL). Pyruvate dehydrogenase complex activity values in PL were enhanced more by 30HT and 60HT than by HT. Protein levels of N-terminal isoform of PGC1 alpha (NT-PGC1 alpha) protein were significantly enhanced in three hyperbaric exposed groups in Gr, but not in LV. These results indicate that hyperbaric exposure for 30 min or longer has beneficial effects on endurance, and 60-min exposure has the potential to further increase performance by facilitating fatty acid metabolism in skeletal and cardiac muscles in highly trained mice. NT-PGC1 alpha may have important roles for these adaptations in skeletal muscle. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/83924 |
| Appears in Collections: | 国際広報メディア・観光学院，メディア・コミュニケーション研究院 (Graduate School of International Media, Communication and Tourism Studies / Research Faculty of Media and Communication) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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