Luminescence. 2008 Jan-Feb;23(1):49-53. Links The effects of a two-hour judo training session on the neutrophil immune functions in university judoists.Umeda T, Yamai K, Takahashi I, Kojima A, Yamamoto Y, Tanabe M, Totsuka M, Nakaji S, Sugawara N, Matsuzaka M. Department of Social Medicine, Hirosaki University School of Medicine, 5 Zaifu-cho, Hirosaki, 036-8562 Aomori, Japan. The present study examined the effects of judo training on neutrophil and related functions. We measured and studied changes in the neutrophil and its related functions in 22 male university judoists immediately before (Pre values) and immediately after (Post values) a 2 h training session: reactive oxygen species (ROS) production capability, phagocytic activities (PA) and serum opsonic activity (SOA). Neutrophil count in whole blood, myogenic enzymes (creatine kinase, lactate dehydrogenase, aspartate aminotransferase and alanine aminotransferase), immunoglobulins (IgG, IgA and IgM) and complements (C3 and C4) in serum were also measured. The Post values of the neutrophil count, myogenic enzymes and IgG increased significantly compared with the Pre values. ROS production capability and SOA also significantly increased following training, although PA showed a slight decrease (but not statistically significant). Taking the findings of our previous studies into consideration, three major neutrophil or related functions, namely ROS production capability, PA and SOA, might compensate for each other to maintain the overall integrity of the neutrophil immune function, in that ROS and SOA increased to compensate for the slight decrease in PA, or PA slightly decreased to compensate for the increase in ROA and SOA after exercise. © 2008 John Wiley & Sons, Ltd.