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Comparison of Interleukin-8 Levels in Long-Distance Runners and Healthy Sedentary Non-Athletic Control Subjects  

Shin, Young-Oh (Department of Physiology, College of Medicine, Soonchunhyang University)
Bae, Jun-Sang (Department of Physiology, College of Medicine, Soonchunhyang University)
Min, Ji-Won (Department of Physiology, College of Medicine, Soonchunhyang University)
Lee, Jeong-Beom (Department of Physiology, College of Medicine, Soonchunhyang University)
Kim, Jung-Kyu (Department of Leisure Sports, Kangwon National University)
Song, Young-Ju (Sports and Recreation Studies, Sunmoon University)
Yang, Hun-Mo (Department of Physiology, College of Medicine, Soonchunhyang University)
Min, Young-Ki (Department of Physiology, College of Medicine, Soonchunhyang University)
Publication Information
The Korean Journal of Physiology and Pharmacology / v.11, no.6, 2007 , pp. 263-267 More about this Journal
Abstract
We have previously demonstrated that the level of leukocytes and neutrophils significantly increased immediately and 30 min after exercise. Interleukin-8 (IL-8) is an inflammatory cytokine that acts as a chemokine on neutrophils. In the present study, we evaluated the correlation between the number of neutrophils and leukocytes, and between the number of neutrophils and plasma IL-8 level. Long-distance trained runners (TRs, n = 10) and untrained sedentary control subjects (SEDs, n = 10) ran for one hour at 70% of heart rate reserve. In the TR, the number of neutrophils correlated significantly with the number of leukocytes in the blood. However, there was no correlation between the number of neutrophils and the plasma IL-8 concentration in both groups. Expressions of IL-8 protein and mRNA were markedly higher in the TRs as compared to the SEDs at three time intervals (pre-exercise, immediately after exercise, and post exercise). In conclusion, our results show that 1) the neutrophil level was dependent on the level of leukocytes 2) there was no correlation between the neutrophils count and plasma IL-8 concentration and 3) a higher plasma IL-8 level in athletes may be a unique characteristic of intensive training.
Keywords
Interleukin-8; Leukocyte; Exercise; Neutrophil; Trained runner; Plasma;
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