When performing exercise induced 31P MRS motion and activities from the everyday life and the positioning of the investigated extremities within the MR scanner should be considered, since this could induce partial ischemia effects like muscular cramps. The aim of this study was to prove the effect of muscle tension on metabolic parameter measured by 31P MRS after an intense exercise. PCr recovery as well as pH kinetic was significantly slowed by a partial ischemia preventing a quantitative evaluation.
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