Turns‐amplitude analysis of the electromyographic recruitment pattern disregarding force measurement. I. Method and reference values in healthy subjects

We used turns‐amplitude analysis to characterize the EMG recruitment pattern disregarding force measurement. The electrical muscle pattern of the brachial biceps (BB), abductor pollicis brevis (APB), medial vastus (MV), and anterior tibial (AT) muscles was analyzed during progressive increase in force from rest to maximum using the mean amplitude as an indicator of the force of the muscle. The following parameters were obtained on‐line: the maximal ratio of turns to mean amplitude (peak‐ratio, PR), the mean amplitude, and the number of time intervals (Tl) between turns at PR and at near maximum force (NMF). The highest PR values were obtained in BB, the lowest in MV. Analysis of the distribution of the Tl between turns at different degrees of voluntary contraction showed fewer spikes with short duration and small amplitude at high force compared with low force. © 1992 John Wiley & Sons, Inc.

[1]  A. Fuglsang-Frederiksen,et al.  Analysis of electrical activity of normal muscle in man at different degrees of voluntary effort. , 1975, Journal of neurology, neurosurgery, and psychiatry.

[2]  S D Nandedkar,et al.  Simulation and analysis of the electromyographic interference pattern in normal muscle. Part I: Turns and amplitude measurements , 1986, Muscle & nerve.

[3]  F Buchthal,et al.  Diagnostic yield of the analysis of the pattern of electrical activity of muscle and of individual motor unit potentials in neurogenic involvement. , 1977, Journal of neurology, neurosurgery, and psychiatry.

[4]  F Buchthal,et al.  Diagnostic yield of analysis of the pattern of electrical activity and of individual motor unit potentials in myopathy. , 1976, Journal of neurology, neurosurgery, and psychiatry.

[5]  M. Hayward,et al.  Automatic analysis of the electromyogram in healthy subjects of different ages , 1977, Journal of the Neurological Sciences.

[6]  L J Dorfman,et al.  A comparison of turns analysis and motor unit analysis in electromyography. , 1991, Electroencephalography and clinical neurophysiology.

[7]  A. Fuglsang-Frederiksen,et al.  Turns analysis (peak ratio) in EMG using the mean amplitude as a substitute of force measurement. , 1985, Electroencephalography and clinical neurophysiology.

[8]  H. Christensen,et al.  Processing of electrical activity in human muscle during a gradual increase in force. , 1984, Electroencephalography and clinical neurophysiology.

[9]  S D Nandedkar,et al.  Automatic analysis of the electromyographic interference pattern. Part II: Findings in control subjects and in some neuromuscular diseases , 1986, Muscle & nerve.

[10]  E Stålberg,et al.  Automatic analysis of the EMG interference pattern. , 1983, Electroencephalography and clinical neurophysiology.

[11]  R G Willison,et al.  Quantitative electromyography using automatic analysis: studies in healthy subjects and patients with primary muscle disease. , 1967, Journal of neurology, neurosurgery, and psychiatry.