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Change in the capability of reactive oxygen species from neutrophils following weight reduction in female judoists
  1. Makoto Yegaki (nakaji{at}cc.hirosaki-u.ac.jp)
  1. Department of Social Medicine, Hirosaki University School of Medicine, 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. Ippei Takahashi (nakaji{at}cc.hirosaki-u.ac.jp)
        1. Department of Social Medicine, Hirosaki University School of Medicine, Japan
          1. Norio Sugawara (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. Noriko Mochida (nakaji{at}cc.hirosaki-u.ac.jp)
              1. Nippon Sport Science University, Japan
                1. Yousuke Yamamoto (nakaji{at}cc.hirosaki-u.ac.jp)
                1. Nippon Sport Science University, Japan
                  1. Arata Kojima (nakaji{at}cc.hirosaki-u.ac.jp)
                  1. Nippon Sport Science University, Japan
                    1. Masaru Tanabe (nakaji{at}cc.hirosaki-u.ac.jp)
                    1. Nippon Sport Science University, Japan

                      Abstract

                      Objective: Athletes undergoing weight reduction are recognized as being more prone to infection. Few studies exist for athletes, however, on the weight reduction-mediated changes in neutrophil function and related activities such as reactive oxygen species (ROS) production capability, phagocytic activity (PA) and serum opsonic activity (SOA).

                      Methods: Sixteen female university judoists were examined in the early morning of the first day (pre-values) and the last day (post-values) of a 20-day pre-competition training period. Of the 16 subjects, 8 needed to reduce weight (WR group), and the other 8 did not (control group). The parameters assessed were the neutrophil count, serum immunoglobulins and complements, myogenic enzymes, ROS production capability, PA and SOA.

                      Results: Comparing the post- with the pre-values, ROS production significantly increased in both groups (p<0.01 for both); PA significantly decreased in the WR group (p<0.05), though it decreased in the control group even if it was not significant; and SOA significantly increased in the WR group (p<0.05), though it showed no significant change in the WR group.

                      Conclusions: The changes in the WR group were most probably a direct consequence of the weight reduction regimen coupled with the exercise regimen, suggesting that neutrophil parameters (ROS production, PA and SOA) had tended to deviate from their typical compensatory changesto maintain immune system homeostasis.

                      • female judoist
                      • neutrophil
                      • reactive oxygen species
                      • serum opsonic activity
                      • weight reduction

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