Faculty Collaboration Database

Form factor analysis of the surface electromyographic interference pattern. Muscle Nerve 2020 Aug;62(2):233-238

Date

05/18/2020

Pubmed ID

32415859

DOI

10.1002/mus.26922

Scopus ID

2-s2.0-85085566795 (requires institutional sign-in at Scopus site)   8 Citations

Abstract

INTRODUCTION: In contrast to needle electromyography (EMG), surface EMG recordings are painless. It is of interest to develop methods to analyze surface EMG for diagnostic purposes.

METHODS: Surface EMG interference pattern (SIP) recordings from the abductor pollicis brevis muscle of healthy subjects and subjects with amyotrophic lateral sclerosis (ALS) were analyzed by measuring root-mean-square (RMS) voltage, mean rectified voltage, form factor (FF), and the clustering index (CI). The FF vs SIP area plot was used for analysis.

RESULTS: The SIP FF was increased and abnormal in ALS subjects, especially when SIP area was less than 200 mVms. Power regression showed a faster FF decline with SIP area in ALS patients than in healthy subjects. The CI and FF showed a strong correlation.

DISCUSSION: FF is easy to calculate and demonstrates abnormalities in ALS patients.

Author List

Nandedkar SD, Barkhaus PE, Stålberg EV

Author

Paul E. Barkhaus MD Professor in the Neurology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Action Potentials
Adult
Aged
Aged, 80 and over
Amyotrophic Lateral Sclerosis
Case-Control Studies
Electrodiagnosis
Electromyography
Female
Hand
Humans
Male
Middle Aged
Muscle Contraction
Muscle, Skeletal