Complete dopamine neuron count in substantia nigra sections of lesioned and non-lesioned hemispheres of the MSR (n = 10), NSR (n = 9), MSNR (n = 10) and NSNR (n = 10) rats. A two-way ANOVA revealed a significant effect of exercise in the non-lesioned (R) hemisphere (F(1.35) = 188, p < 0.0001). *(MSR vs MSNR, p < 0.001 and NSR vs NSNR, p < 0.001, post-hoc Tukey HSD test)