Reinhard Rzanny1, Norbert Stutzig2, Alexander Gussew1, Werner Alois Kaiser, Hans-Alexander Thorhauer2, Jrgen R. Reichenbach1
1Medical Physics Group, Institute of Diagnostic and Interventional Radiology, University Clinics Jena, Jena, Germany; 2Institute of Sports Science, Friedrich-Schiller-University Jena, Jena, Germany
A group of six professional volleyball players was investigated by 31P-MRS at 3.0 T before and after a complex training procedure. The estimated PCr/ATP ratios of the medial and lateral head M. gastrocnemius were used to compare trainings effects of a plyometric training and a modified plyometric training including additional applications of EMS pulses. The results indicate lower reduced PCr/ATP ratios for the medial head muscle after the modified plyometric training.This was interpreted as a reduction of the fiber shift from type II to type I by the aditional application of EMS in the training.
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