efeito do exercício de ultrarresistência sobre parâmetros de estresse oxidativo effect of the ultra-endurance exercise on oxidative stress parameters

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ID: 161310
2009
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Abstract
INTRODUÇÃO: Exercícios de longa duração podem levar ao desequilíbrio entre os sistemas pró e antioxidante, acarretando dano a lipídeos, proteínas e DNA. Entretanto, alguns estudos avaliando triatlo Ironman observaram proteção aos lipídeos. OBJETIVO: Avaliar parâmetros de estresse oxidativo após uma competição de meio Ironman. MÉTODOS: Participaram 11 sujeitos com idade de 31,1 ± 3,3 anos, massa corporal de 72,4 ± 5,4kg, estatura de 176,2 ± 4,8cm, gordura corporal de 9,8 ± 3,3 %, VO2máx na corrida de 60,7 ± 6,0mL/kg/min. Foram mensurados: dano a lipídeos através da quimiluminescência nos eritrócitos e TBARS no plasma, dano a proteínas através das carbonilas plasmáticas, ácido úrico e compostos fenólicos plasmáticos, assim como a atividade antioxidante enzimática da catalase, superóxido dismutase e glutationa peroxidase nos eritrócitos. RESULTADOS: Houve redução na atividade da enzima superóxido dismutase (23,24 ± 1,49 para 20,77 ± 2,69U SOD/mg proteína, p = 0,045), e aumento no ácido úrico (40,81 ± 10,68 para 60,33 ± 6,71mg/L, p < 0,001) logo após a competição. Não houve diferença estatisticamente significativa na atividade das enzimas antioxidantes catalase e glutationa peroxidase e nos compostos fenólicos totais, assim como não foi observado dano a lipídeos (TBARS e quimiluminescência) e proteínas (carbonilas). CONCLUSÃO: Esse grupo de atletas não sofreu estresse oxidativo, provavelmente devido à liberação de ácido úrico e outros antioxidantes no plasma.
Ultra-endurance exercises can cause imbalance between the pro and antioxidant systems, leading to lipid, protein and DNA damage. Nevertheless, some studies evaluating Ironman triathlon found protection to lipids. PURPOSE: To evaluate oxidative stress parameters after a half-Ironman competition. METHODS: Eleven subjects aged 31.1 ± 3.3 yr, body weight 72.4 ± 5.4 kg, height 176.2 ± 4.8 cm, body fat 9.8 ± 3.3 %, VO2máx on run 60.7 ± 6.0 mL/kg/min, participated in this study. The following data were measured: lipid damage by chemoluminescence in erythrocyte and TBARS in plasma, protein damage by plasmatic carbonyls, uric acid and phenolic compounds, as well as the antioxidant enzymatic activity of catalase, superoxide dismutase and glutathione peroxidase in erythrocytes. RESULTS: Reduction in superoxide dismutase (23.24 ± 1.49 to 20.77 ± 2.69 U SOD/mg protein, p = 0.045), and increase in uric acid (40.81 ± 10.68 to 60.33 ± 6.71 mg/L, p < 0.001) were found immediately after the competition. No statistically significant differences were found in catalase and glutathione peroxidase or phenolic compounds. Lipid (TBARS and chemoluminescence) or protein (carbonyl) damage was not observed either. CONCLUSION: These athletes did not suffer oxidative stress, probably due to uric acid and other plasmatic antioxidants release in the plasma.
Reference Key
schneider2009revistaefeito Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Cláudia Dornelles Schneider;Márcio Martins Silveira;José Cláudio Fonseca Moreira;Adriane Belló-Klein;Alvaro Reischak de Oliveira
Journal research disclosure
Year 2009
DOI
10.1590/S1517-86922009000200001
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-86922009000200001
Keywords
uric acid free radicals superoxide dismutasesports medicine

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