Immune and Hormonal Response to High-intensity Exercise During Orienteering.

Orienteering is an endurance sport that combines physical and cognitive activity, during which the athlete must complete a course with several points distributed over unknown terrain in the shortest possible time. A number of studies have investigated the body's physiological adaptations to the stress caused during competition, but not the immunological changes. To that end, the present study evaluated the immunological, physiological and pathological responses in athletes performing high-intensity physical exercise during an orienteering race. The 30 athletes tested belonged to the elite orienteering category and participated in the regional championship. Cortisol levels were determined before and after the competition to assess stress response, as were the cytokines IL-2, IL-4, IL-6, IL-10, TNF-α, IFN-γ and IL-17 to evaluate the immune response. Cortisol levels increased after the competition, indicating a stress condition. IFN-γ, IL-6 and IL-10 levels also rose post competition. The results indicate that orienteers are exposed to high stress levels, and that this condition affects their immune and endocrine systems, triggering a predominantly anti-inflammatory response, likely an athlete's mechanism of adaptation to the stress imposed by high-intensity physical exercise.

Análise de biomarcadores séricos de lesão muscular durante competição de mountain bike / Analysis of muscle injury serum biomarkers during a mountain bike competition

Introdução: O estudo de biomarcadores musculares permite diagnóstico de futuras lesões no esporte de alto nível. Objetivo: Avaliar a creatinoquinase (CK) e lactato desidrogenase (LDH) em atletas Mountain Bike. Métodos: Foram coletadas amostras sanguíneas de dez atletas de Elite de Mountain Bike. As coletas de sangue foram realizadas 24 horas antes da prova (T1), imediatamente ao final da corrida (T2), uma hora após a corrida (T3) e 24 horas depois da competição (T4). Resultados: A CK se elevou da ordem de 100% em 24 horas após a competição. Já LDH aumentou 43% em T2, permanecendo elevado até 1h após competição. A correlação entre os dois marcadores apresentou o coeficiente r = 0,80. Conclusão: O acompanhamento das concentrações de CK e LDH neste experimento foi possível estimar a recuperação pós-competição dos atletas em níveis de lesão muscular, o que se converte em valiosa ferramenta para a planificação e periodização do treinamento.

Introduction: Biomarkers muscles allows diagnosis of future injuries in overall sport. Objective: Evaluate the creatine kinase (CK) and lactate dehydrogenase (LDH) in Mountain Bike athletes. Methods: Blood samples of ten athletes Elite Mountain Bike was collected. The samples of blood were taken 24 hours before (T1) immediately at the end (T2), one hour after the race (T3) and 24 hour after competition (T4). Results: The CK amounted to around 100 % in 24 hours after the competition. LDH already increased by 43 % and remaining high until 1 hour after competition. The correlation between the two biomarkers showed coefficient r = 0.80. Conclusion: The monitoring of concentrations of CK and LDH in this experiment it was possible to estimate muscle injury post-competition, which becomes a valuable tool for planning and periodization of training.