PMID: 8594002Nov 1, 1995Paper

Simultaneous 31P-NMR spectroscopy and EMG in exercising and recovering human skeletal muscle: a correlation study

Journal of Applied Physiology
P Vestergaard-PoulsenO Henriksen

Abstract

A large number of studies have shown amplitude and spectral changes of the electromyogram during exercise, leading to several theories of how these changes might be related to the underlying metabolic changes. The amplitude and spectral changes are generally interpreted as changes in motor unit recruitment and a reduction of the muscle fiber conduction velocity due to proton or lactate accumulation. This study focuses on the causality of spectral changes of the surface electromyogram and proton or lactate accumulation and how the changes in motor unit recruitment are related to the metabolic status of the muscle. Simultaneous 31P-nuclear magnetic resonance spectroscopy and surface electromyography were performed during sustained static exercise and recovery in healthy volunteers and a patient with McArdle's disease. A clear dissociation between the median power frequency of the surface electromyogram and pH was seen in the healthy volunteers during recovery and during exercise in the patient with McArdle's disease. The results indicate that proton or lactate accumulation is not primarily responsible for the spectral changes of the surface electromyogram as previously suggested. The motor unit recruitment (as judged by the root ...Continue Reading

Citations

Jun 7, 2003·Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Médicas E Biológicas·F V SerrãoT F Salvini
Oct 18, 2007·Pflügers Archiv : European journal of physiology·Jochen ZangeNorbert Maassen
Mar 28, 2008·Physiological Measurement·A RainoldiG Melchiorri
Nov 12, 2005·Journal of Applied Physiology·Nicolas BabaultMichel Pousson
Nov 25, 2006·Sports Medicine·Sébastien RatelCraig A Williams
Dec 13, 2006·Biomedizinische Technik. Biomedical Engineering·Reinhard RzannyWerner A Kaiser
Feb 12, 2009·Journal of Strength and Conditioning Research·Anderson Souza OliveiraBenedito Sérgio Denadai
Jan 1, 1996·European Journal of Applied Physiology and Occupational Physiology·W AmentG J Verkerke

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