Journal
LUMINESCENCE
Volume 28, Issue 2, Pages 121-128Publisher
WILEY
DOI: 10.1002/bio.2350
Keywords
neutrophils; soccer; reactive oxygen species; muscle fatigue; season
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Funding
- Ministry of Education, Science and Culture of Japan [11470092]
- Grants-in-Aid for Scientific Research [11470092] Funding Source: KAKEN
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We examined changes in neutrophil function of soccer players over a 10-month period and determined its effectiveness as an index for athlete physical condition. Subjects included 21 male professional Japanese soccer players. Data on body composition, myogenic enzymes and neutrophil function were obtained before and after 2h of training at 3 investigation points: one week before opening season, at season mid-point, and one week before the last game of the season. As a result, change ratios of myogenic enzyme levels before and after the 2-hr training session at the third investigation point were significantly higher compared to the two other points. Reactive oxygen species production and phagocytic activity significantly increased after 2-hr training session at point 1, although the extent of the increase became smaller over time and ROS production capability decreased significantly by point 3 assessment. Fatigue, especially muscle fatigue, chronically accumulated along with a gradual decrease in neutrophil immune function over the 10-month season. Therefore, determination of neutrophil function can be used as a useful index to assess and understand an athlete's physical condition. Copyright (c) 2012 John Wiley & Sons, Ltd.
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