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Changes of ROS during a Two-day Ultra-marathon Race

2009; Thieme Medical Publishers (Germany); Volume: 30; Issue: 06 Linguagem: Inglês

10.1055/s-0028-1112144

1439-3964

Nami Hattori, Tamaki Hayashi, Ken Nakachi, H. Ichikawa, Chiho Goto, Shinkan Tokudome, Kiyonori Kuriki, Hideki Hoshino, K. Shibata, N. Yamada, Mizuho Tokudome, Sadao Suzuki, Tsutomu Nagaya, Mariko Kobayashi, Shinkan Tokudome,

Sports Performance and Training

To assess oxidative stress (OS) induced by endurance exercise, concentrations of serum reactive oxygen species (ROS) were determined in 70 Japanese male amateur runners completing a two-day ultra-marathon race. Serum ROS levels were analyzed at three time points: before the race (baseline), after the 1st day race (mid-race), and after the 2nd day race (goal) (post-race). The means (SE) of ROS were 151.4(3.7) (U. CARR.), 168.7(4.4), and 156.8(4.4), respectively. Significant positive trends were noted between age and serum ROS concentrations at the three race points (p<0.05 for all). After adjusting for age, BMI and average monthly running distance, the baseline serum ROS concentrations were positively associated with completion times of the first-day race, in particular (p<0.05), suggesting that the concentrations may predict physical performance. The ROS production increased at mid-race (p<0.05), but the levels returned to baseline levels at post-race, indicating that an antioxidant defense system may develop post-race to reduce OS.