Sodium (23Na) imaging can provide insight into the effects of exercise on muscle. Here we perform a 3D dual TE UTE scheme with radial FID readout to assess the alterations in sodium tissue concentration in the gastrocnemius and soleus muscles; immediately after exercise performed inside the scanner using a Trispect pedal system. In addition an mDIXON proton scan was acquired for delineation of the muscle groups. Following exercise, the time course of the 23Na signal intensity in the medial gastrocnemius and soleus muscles was found to return to baseline after approximately 30 minutes, with a 10 – 20 % signal change.
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