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Comparison of multiple point and statistical motor unit number estimation
Author(s) -
LomenHoerth Catherine,
Olney Richard K.
Publication year - 2000
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/1097-4598(200010)23:10<1525::aid-mus8>3.0.co;2-e
Subject(s) - motor unit , standard deviation , mathematics , amplitude , statistical analysis , statistics , statistical significance , statistical hypothesis testing , medicine , physics , anatomy , quantum mechanics
This study compares two common techniques for motor unit number estimation, multiple point stimulation and statistical method, to determine which is more reproducible. Surface recorded motor unit action potentials (SMUPs) of the left hypothenar muscle group were measured on 20 controls and 10 ALS patients. For multiple point, 10 different threshold SMUPs were recorded. For statistical method, mean SMUP amplitude was measured at several stimulus levels, typically spanning >40% of CMAP amplitude range. Both techniques were performed twice, results averaged, electrodes changed, and all recording repeated. For controls, mean of two motor unit number estimation (MUNE) (± standard deviation) was 60 (±5) for statistical method, and 108 (±38) for multiple point. For ALS patients, these values were 21 (±16) for statistical method and 55 (±39) for multiple point. Test‐retest correlation coefficients and coefficients of variation for mean of two MUNE were 0.98 and 7% for statistical method, and 0.90 and 12% for multiple point, respectively. Statistical method was more reproducible and faster than multiple point, supporting its utility in monitoring rates of MUNE change. © 2000 John Wiley & Sons, Inc. Muscle Nerve 23: 1525–1533, 2000.