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.
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