n International SportMed Journal - Analysis of selected physiological performance determinants and muscle damage in a 24-hour ultra-endurance relay race : brief clinical report

Volume 12, Issue 4
  • ISSN : 1528-3356



: Numerous studies have analyzed changes in biochemical blood parameters in ultra-endurance events but never in an ultra-endurance relay race. : The aim of this study is to analyze the biochemical changes in blood during and after a 24-hour ultra-endurance relay event. Type of study: Descriptive field study. : The study was carried out at the Reto de la Plata 2008 sports race in Spain. Eight subjects (33±6.9 years; 172.6±3 cm; 69.3±8.7 kg) had to cover 340km in less than 24h in 20-minute relays. Each runner recovered while the others were running their legs. Blood concentration measurements of creatine kinase (CK), urea, triglycerides, glucose and lactate were taken immediately before the event started (T0) and at three other times: after the first leg (T1), after a relay in the middle of the race (T2) and, finally, during each subject's last but one leg (T3). : A statistically significant increase (p<0.05) was observed in the parameters of creatine kinase and glucose after the first stage of the event. However, the triglycerides, urea and lactate variables revealed no significant differences. : Results demonstrated an increase in muscle damage as shown in the high CK values from the repeated 20-minute relays in the 24-hour ultra-endurance event.

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