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Licensed Unlicensed Requires Authentication Published by De Gruyter December 7, 2006

Investigations of back muscle fatigue by simultaneous 31P MRS and surface EMG measurements

Reinhard Rzanny, Roland Graßme, Jürgen R. Reichenbach, Hans-Christoph Scholle and Werner A. Kaiser
From the journal


Investigations of back muscle fatigue are important for understanding the role of muscle strain in the development of low back pain. The aim of this contribution is to review the two main techniques used for in vivo investigations of metabolic and electrophysiological changes, namely magnetic resonance phosphorous spectroscopy (31P MRS) and surface electromyography (SEMG), and to report some of our recent results on simultaneous measurements using these techniques during isometric back-muscle contraction in volunteers. Since it appears that electrophysiological and metabolic factors are simultaneously involved in the processes of fatigue and muscle recovery during load application, simultaneous acquisition of complete information is quite promising for obtaining new insights into the metabolic origin of electrophysiological changes or vice versa. Performing these measurements simultaneously, however, is more intricate owing to the occurrence of signal artifacts caused by mutual signal interferences of both techniques. Besides these mutual disturbances, further experimental difficulties are related to spatial limitations within the bore of clinical whole-body high-field magnetic resonance (MR) systems (1.5 T) and the sensitivity of MR measurements to motion-induced artifacts. Our own experimental results are presented, and problems that occur using both techniques simultaneously, as well as possibilities to resolve them, are discussed. The results shed light on the interrelation of electrophysiological and metabolic changes during fatigue of the back muscle while performing an exercise.

Corresponding author: Dr. Reinhard Rzanny, AG Medizinische Physik, Institut für Diagnostische und Interventionelle Radiologie, Philosophenweg 3, 07743 Jena, Germany Phone: +49-3641-935361 Fax: +49-3641-9-36767


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Published Online: 2006-12-07
Published in Print: 2006-12-01

©2006 by Walter de Gruyter Berlin New York

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