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Author(s): Antonio Ascensao
Rita Ferreira
Franklim Marques
Eduardo Oliveira
Victor Azevedo
Jose Soares
Jose Magalhaes
Title: Effect of off-road competitive motocross race on plasma oxidative stress and damage markers
Issue Date: 2007
Abstract: Aim: To analyse the effect of an off-road motocross heat on plasma levels of oxidative stress and damage, blood leucocyte counts and urine catecholamine concentration. Methods: Plasma contents of total, reduced and oxidised (GSSG) glutathione, %GSSG, malondialdehyde (MDA), protein carbonyl and sulphydryl groups, total antioxidant status (TAS), uric acid, and blood neutrophil and lymphocyte counts were evaluated in 10 male top-level riders before, immediately after (0 h) and 1 h after a simulated competitive motocross race. 24-h urine adrenaline, noradrenaline and dopamine concentrations were also measured. Results: The motocross heat resulted in an increase in plasma oxidative stress and damage (p < 0.05). This was shown by a significant increase in %GSSG, TAS, MDA and carbonyls, and by a decrease in sulphydryl groups after the race. There was a significant increase in both plasma uric acid and urine catecholamine concentration after the race (p < 0.05). Blood neutrophil counts increased at 0 and 1 h after exercise (p < 0.05). Lymphocyte count increased from baseline to 0 h, although it decreased from baseline and 0 to 1 h after exercise (p < 0.05). Conclusion: The data reinforce the marked metabolic and hormonal demands imposed by motocross, resulting in a condition of enhanced plasma oxidative stress and damage.
Subject: Ciências da saúde
Health sciences
Scientific areas: Ciências médicas e da saúde::Ciências da saúde
Medical and Health sciences::Health sciences
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FADEUP - Artigo em Revista Científica Internacional
FFUP - Artigo em Revista Científica Internacional

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