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Sarcolemmal excitability in myotonic dystrophy: Assessment through surface EMG

Corresponding Author

Carmelo Chisari MD

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, Italy

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, ItalySearch for more papers by this author

Claudia D'Alessandro BS,

Claudia D'Alessandro BS

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, Italy

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M. Laura Manca BS,

M. Laura Manca BS

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, Italy

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Bruno Rossi MD,

Bruno Rossi MD

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, Italy

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Carmelo Chisari MD,

Corresponding Author

Carmelo Chisari MD

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, Italy

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, ItalySearch for more papers by this author

Claudia D'Alessandro BS,

Claudia D'Alessandro BS

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, Italy

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M. Laura Manca BS,

M. Laura Manca BS

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, Italy

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Bruno Rossi MD,

Bruno Rossi MD

Department of Neuroscience, Section of Neurology, University of Pisa, Via Roma 67, 56126 Pisa, Italy

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First published: 07 December 1998

https://doi.org/10.1002/(SICI)1097-4598(199804)21:4<543::AID-MUS17>3.0.CO;2-Y

Citations: 17

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Abstract

A motor point stimulation protocol was carried out on the tibialis anterior of myotonic dystrophy (MyD) patients. The surface myoelectric signal was monitored to record average rectified value (ARV), median frequency of power spectrum (MDF), and conduction velocity (CV) parameters. The ARV curve showed a decreasing trend that reveals a reduction in the M-wave amplitude during stimulation. MDF presented a significant decrement in the first seconds of sustained contraction, probably caused by abnormal lengthening of the depolarization zone. CV was significantly lower in patients, suggesting reduced mean fiber size. © 1998 John Wiley & Sons, Inc. Muscle Nerve 21:543–546, 1998.

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Volume21, Issue4

April 1998

Pages 543-546

Sarcolemmal excitability in myotonic dystrophy: Assessment through surface EMG

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Sarcolemmal excitability in myotonic dystrophy: Assessment through surface EMG

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