PMID: 11335051May 4, 2001Paper

Exercise-induced inflammatory reaction affects electromyographic changes in skeletal muscle during dynamic contractions in humans

Neuroscience Letters
Marc GainnierY Jammes

Abstract

In order to assess the role of exercise-induced inflammatory reactions on electromyographic (EMG) changes in humans, we have recorded, during a 3-min dynamic handgrip exercise at a high strength (112 w), the surface EMG and the compound evoked muscle action potential (M-wave) in control conditions, and this after ingestion of a well known cyclooxygenase blocker i.e. acetylsalicylic acid (ASA), either as a single dose treatment (10 mg/kg) and as a 3-day treatment (30 mg/kg per day). The power spectrum density function of EMG allowed us to compute both the median frequency (MF) and the energies in a low- and a high-frequency band. We estimated the lactic acid concentration from blood samples drawn from an antecubital vein and we noted that its production was not affected by ASA (single dose or 3-day treatment). We observed at the end of exercise that no change in M-wave duration and conduction time occurred though the median frequency always fell. However, we noted that the slope of the MF vs. time regression line was halved after the 3-day ASA treatment which may indicate that inflammatory reactions are elicited by exhausting contractions and affect the EMG changes.

References

Oct 1, 1986·The Journal of Physiology·B R Bigland-RitchieO C Lippold
Sep 1, 1982·The Journal of Physiology·B Bigland-RitchieJ J Woods
Jul 1, 1981·IEEE Transactions on Bio-medical Engineering·F B Stulen, C J DeLuca

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Citations

Aug 25, 2009·Pflügers Archiv : European journal of physiology·Stephane DelliauxYves Jammes
Oct 17, 2002·Respiratory Physiology & Neurobiology·Jean SteinbergYves Jammes
Apr 2, 2004·Clinical Physiology and Functional Imaging·Marion FaucherYves Jammes
Jul 23, 2003·Muscle & Nerve·Tanguy MarquesteYves Jammes

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