Normalized blood flow, NBF (a) and normalized blood volume, NBV (b) in hind limb muscle (HL). Data was collected over a 14-16 week period from age 6 to 20-22 in exercised w.t. (W.T.-Ex), non-exercised mdx (MDX-N.E.), exercised mdx (MDX-Ex) and non-exercised udx (UDX-N.E.) mice. Plotted values are means and standard deviations of NBF and NBV of surviving mice from each group. Significant differences (p <0.05) were found at age 8 and 20 between: W.T.-Ex and MDX-N.E. (μ), W.T.-Ex and MDX-Ex (*), W.T.-Ex and UDX-N.E.(ψ), MDX-N.E. and UDX-N.E. (≏), MDX-N.E. and MDX-Ex (ϕ).