The purpose of this study is to investigate the paradoxical muscle enlargement in the calves and tongue seen in patients affected by Becker muscular dystrophy and Limb-girdle muscular dystrophy type 2I. The enlarged calves' muscle quality will be assessed primarily on the basis of the muscle structure on MRI and based on a calculation of muscle strength per cross-sectional area.The findings will be compared with results from non-affected controls. Additionally we want to describe the tongue muscle appearance on T1-weighted MRI.
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Calves muscle quality
Timeframe: 1 day