タイトル | Responses of vastus lateralis muscle fibers to cycling tr aining with different loading parameters in human |
著者(日) | 寺田, 昌弘; 河野, 倫史; 青山, 利春; 今泉, 和彦; 大平, 充宣 |
著者(英) | Terada, Masahiro; Lyubaeva, E.; Ohira, T.; Netreba, A.; Kawano, Fuminori; Okabe, H.; Aoyama, Toshiharu; Imaizumi, Kazuhiko; Vinogradova, O.; Ohira, Yoshinobu |
著者所属(日) | 大阪大学生命機能研究科; 大阪大学生命機能研究科; 大阪大学医学系研究科; 国士舘大学文学部; 国士舘大学スポーツシステム研究科; 早稲田大学人間科学部; 大阪大学医学系研究科 |
著者所属(英) | Graduate School of Frontier Biosciences, Osaka University; State Scientific Center of Russian Federation-Institute for Biomedical Problems; Graduate School of Frontier Biosciences, Osaka University; State Scientific Center of Russian Federation-Institute for Biomedical Problems; Graduate School of Medicine, Osaka University; Faculty of Letters, Kokushikan University; Graduate School of Sports System, Kokushikan University; Faculty of Human Sciences, Waseda University; State Scientific Center of Russian Federation-Institute for Biomedical Problems; Graduate School of Medicine, Osaka University |
発行日 | 2007-06-01 |
発行機関など | 日本宇宙航空環境医学会 Japan Society of Aerospace and environmental Medicine |
刊行物名 | 宇宙航空環境医学 Japanese journal of aerospace and environmental medicine |
巻 | 44 |
号 | 2 |
開始ページ | 59 |
終了ページ | 64 |
刊行年月日 | 2007-06-01 |
言語 | eng |
抄録 | Responses of single muscle fibers of human vastus lateralis muscle to 8-week training with different loading parameters were studied in 22 male subjects, using a specially designed training machine with compulsory rotation of pedals induced by electrical engine. Three types of cycling were compared: (1) forward (concentric) with high velocity and (2) rearward (eccentric) compulsory rotation of pedals with high or (3) low velocity. Pedaling/rotation rate was 70 per min for high velocity groups and 35 rotations per min for low velocity group. Loads for high and low velocity groups were approximately 60 % and 90 % of the maximal alactic power accordingly. The repetitive exercise consisting of 1-min work periods divided by long (10 min) resting periods was used. Exercise bouts were repeated 5-7 times with 10-min resting periods. The training was performed twice a week for 8 weeks. Biopsy samples were taken from the vastus lateralis muscle before and after the training. Single muscle fibers were mechanically isolated and fiber cross-sectional area (CSA), myonuclear number, myonuclear CSA, and myonuclear domain were analyzed using a confocal microscope. Myonuclear CSA and myonuclear number per mm of fiber length did not change significantly after training in both regimes, although fiber CSA was increased significantly after eccentric training at either low or high intensity. Myonuclear domain size was also increased significantly by concentric and eccentric exercise. It was suggested that eccentric training was more effective for induction of muscle fiber hypertrophy. However, this phenomenon was not directly related to the increase of number and/or size of myonuclei. |
キーワード | concentric or eccentric bicycle exercise, vastus lateralis muscle, fiber size, myonuclei |
資料種別 | Journal Article |
ISSN | 0387-0723 |
NCID | AN00019323 |
SHI-NO | AA0063598002 |
URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/21084 |
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