Figure 7.

Water T₁ and T₂ MRF maps in a volunteer's calf before and after exercise. The water T₁ and the T₂ maps show an increase of approximately 65 ms and 9 ms, respectively, directly after exercise. The percentage difference between the parameter maps before and after exercise (with respect to at rest) shows that this increase is most pronounced in the gastrocnemius medialis (GM), the gastrocnemius lateralis (GL), and the peroneus longus (PL), whereas water T₁ and T₂ values in other muscles are mostly unchanged. Circular flow artifacts are visible around the larger vessels