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Effects of long-term training on neutrophil function in male university judoists
  1. Yousuke Yamamoto (nakaji{at}cc.hirosaki-u.ac.jp)
  1. Nippon Sport Science University, Japan
    1. Shigeyuki Nakaji (nakaji{at}cc.hirosaki-u.ac.jp)
    1. Department of Social Medicine, Hirosaki University School of Medicine, Japan
      1. Takashi Umeda (nakaji{at}cc.hirosaki-u.ac.jp)
      1. Department of Social Medicine, Hirosaki University School of Medicine, Japan
        1. Masashi Matsuzaka (nakaji{at}cc.hirosaki-u.ac.jp)
        1. Department of Social Medicine, Hirosaki University School of Medicine, Japan
          1. Ippei Takahashi (nakaji{at}cc.hirosaki-u.ac.jp)
          1. Department of Social Medicine, Hirosaki University School of Medicine, Japan
            1. Masaru Tanabe (nakaji{at}cc.hirosaki-u.ac.jp)
            1. Nippon Sport Science University, Japan
              1. Kazuma Danjo (tabikokoro{at}cc.hirosaki-u.ac.jp)
              1. Department of Social Medicine, Hirosaki University School of Medicine, Japan
                1. Arata Kojima (nakaji{at}cc.hirosaki-u.ac.jp)
                1. Nippon Sport Science University, Japan
                  1. Takao Oyama (nakaji{at}cc.hirosaki-u.ac.jp)
                  1. Department of Social Medicine, Hirosaki University School of Medicine, Japan

                    Abstract

                    Objectives: To clarify the effects of high intensity and high frequency long-term/chronic training on neutrophil function and serum level of myogenic enzymes in male university judoists. Methods: The subjects were 24 male university judoists who had stopped judo training for six months and had restarted their training. The following parameters were examined before and after a 2 h unified exercise loading (UEL) at the beginning of the restarted quotidian training (pre-training) and at two months, four months, and six months thereafter: myogenic enzymes, neutrophil and leukocyte counts, and neutrophil phagocytic activity (PA) and oxidative burst activity as a measure of reactive oxygen species (ROS) production capability. Results: Myogenic enzymes that were measured after UEL at all four points significantly increased and neutrophil counts significantly increased after UEL at the pre-training, two- and four-month points, but these changes became smaller from the two-month point. PA significantly decreased after UEL at the pre-training and two-month points, but no change was seen at the four- and six-month points. On the other hand, no change in ROS production per cell after UEL was seen at the pre-training point, but it significantly increased after UEL at the two-, four- and six-month points. Furthermore, there were no significant differences in the changing rates at the three last assessment points. Conclusion: The changing rate of the levels of UEL-mediated myogenic enzymes, neutrophil mobilization and neutrophil function was seen to decrease during daily training at the two- and four-month-assessments: these may comprise at least some of the long-term training effects.

                    • judo
                    • judo training
                    • neutrophil
                    • phagocytosis
                    • reactive oxygen species

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                    • Miscellaneous
                      BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine
                    • Original article
                      Y Yamamoto S Nakaji T Umeda M Matsuzaka I Takahashi M Tanabe K Danjo A Kojima T Oyama