Figure 1From: Protective action of a hexane crude extract of Pterodon emarginatus fruits against oxidative and nitrosative stress induced by acute exercise in rats Effect of acute exercise on serum creatine kinase (CK) activity. The CK levels were determined in rested control and after acute exercise, at the indicated times. The results are the mean ± SE of 8â10 rats per treatment. Significance was determined with one-way ANOVA followed by the Tukey-Kramer test. Columns with different letters differed significantly (p < 0.05).Back to article page