Tissue variables (mg/100 g) at rest and after acute physical exercise at the end of the experiment (60 days). Results expressed as the mean ± standard deviation of 10 rats per group. B: balanced; BF: balanced/fructose; LB: low protein/balanced; LF: low protein/fructose. Different letters indicate significant difference among groups. Two-Way ANOVA and Newman-Keuls' Post-Hoc (p < 0.05). *intra-group difference by Student's t-test (at rest vs. acute physical exercise).