Automatic Decomposition of the Clinical Electromyogram
Citations
426 citations
Cites background from "Automatic Decomposition of the Clin..."
...Applications to separate the EMG signals did not appear until a full decade later (Andreassen 1983; De Figueiredo and Gerber 1983; De Luca and Forrest 1972; De Luca et al. 1982a,b; Guiheneuc et al. 1989; LeFever and De Luca 1978; Mambrito and De Luca 1984; McGill et al. 1985)....
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293 citations
Cites background or methods from "Automatic Decomposition of the Clin..."
...McGill et al., 1985; Haas and Meyer, 1989; De Luca, 19 Stashuk, 2001; Zennaro et al., 2003)....
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...…heir uum disitute that ount lso o or UPs lve islete unit nd rge 0 d esults show that 100% accuracy can be achieved for MUPs with peak-to-peak amplitudes greater than 2.5 times the rms signa xamples are presented to show how decomposition can be used to investigate motor-unit recruitment and…...
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...The two wires had been inserted together using a single hypodermic needle, and their recording surfaces were separated by about 2 mm due to different barb lengths....
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...…ubtracts out the effect of the interference from the o UPs to achieve signal-to-noise ratios much higher hose obtained using simple averaging (McGill et al., 1985). n this way, EMGLAB is able to obtain MUP averages acc ble for architectural analysis from 10 or 20 s long epo ven in fairly…...
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252 citations
Cites background or methods from "Automatic Decomposition of the Clin..."
...Several modelling approaches have been reported [9,23,26,43]....
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...Others have used partitioning methods such as a modified K-means technique [71] and the leader-based approach [36,41,43,48,65]....
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...One consistent method of selecting segments that contain MUAPs that can be consistently correctly assigned is to consider the slope of the micro-EMG signal [23,38,40] or the micro-EMG signal after it has been passed through a low pass differentiator [27,28,36,43,46,75]....
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...[43] instead adjust acceptance thresholds based on MUAP size....
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...All of these techniques are similar in that they reduce the space required to be searched by first selecting a subset of possibly contributing MUAPs, limit the number of assumed contributing MUAPs to 2 or 3, initially align the MUAPs using either peak values [43] or maximal correlation [9] and use optimization techniques to solve for the model parameters....
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214 citations
198 citations
Cites background or methods from "Automatic Decomposition of the Clin..."
...[10]....
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...Recently however, several clinical EMG signal decomposition systems have been introduced [7–12] and at least three are currently available on commercial clinical EMG systems and have published reference values [10–15]....
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...Mean, median [11], mode [30], statistical [12] and interference cancelling [10] averaging techniques have been used to reduce the interfering activity of other motor units when estimating the prototypical MUAP....
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References
631 citations
"Automatic Decomposition of the Clin..." refers background in this paper
...Their interspike intervals (ISI's) have an approximately Gaussian distribution whose standard deviation is 10-20 percent of the mean [13], [35]....
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317 citations
"Automatic Decomposition of the Clin..." refers background or methods in this paper
...This alignment is sufficiently accurate-since the spikes are so narrow-that spikes and templates can be compared directly, without first having to be aligned explicitly as in other template-matching schemes [13], [31]....
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...As a result, high-pass filtering [13], [28] or differentation [29] is effective in selecting the spikes from the background activity....
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...The method of LeFever and De Luca [13] can analyze EMG's recorded during strong contractions, but it is too time consuming for clinical use....
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...Their interspike intervals (ISI's) have an approximately Gaussian distribution whose standard deviation is 10-20 percent of the mean [13], [35]....
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...duce misalignment errors resulting from time quantization [13], [31]....
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305 citations
"Automatic Decomposition of the Clin..." refers background in this paper
...MUAP spikes originating from muscle fibers close to the electrode have sharp rising edges while MUAP's originating farther away are broadened due to the low-passfiltering character of the muscle tissue [27]....
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217 citations
"Automatic Decomposition of the Clin..." refers background in this paper
...frequency noise, but it can be performed safely on highSNR signals with band-limited derivatives by restricting the operation to the frequencies of interest [30]....
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...These filters belong to a class of so-called "low-pass differentiators" [30] and have the following properties: 1) they are designed for efficient "Nyquistrate" sampling, 2) they have excellent temporal resolution resulting from their wide bandwidths, and 3) they are very fast, requiring only a few additions and subtractions per sample....
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204 citations
"Automatic Decomposition of the Clin..." refers background or methods in this paper
...Several methods have been developed for quantitatively measuring MUAP properties [1], [6]-[12], but they...
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...Some care is needed in selecting a recording site, but not the precise optimization needed in classical MUAP analysis [1]....
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..." Diagnosis is based on the properties (amplitude, durations, and complexity) of the individual MUAP's-small, fragmented MUAP's indicating muscle-fiber loss in myopathies; large, long-duration MUAP's indicating collateral reinnervation accompanying motoneuron dysfunction in neuropathies [1]-and on the intensity and complexity of the interference pattern-which reflect the pattern of motor-unit recruitment....
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