The effect of recording site on extracted features of motor unit action potential

Artug, Tugrul; Goker, Imran; Bolat, Bulent; Osman, Onur; Orhan, Elif Kocasoy; Baslo, Mehmet Barış

doi:10.1016/j.cmpb.2016.01.003

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…Another explanation for the lower EMG amplitude in patients might be the muscle atrophy caused by repeated BoNT treatment in patients. Finally, a lower amplitude in CD patients might have also have been caused by other factors, such as suboptimal needle placement, further away from the motor units [ 21 ]. The influence of these factors on the autospectral results is unclear, but to minimize the influence of differences in the autospectral power on our results, all autospectra were normalized before spectral analysis.…”

Section: Discussionmentioning

confidence: 99%

Spectral EMG Changes in Cervical Dystonia Patients and the Influence of Botulinum Toxin Treatment

Nijmeijer

Bruijn

Verhagen

et al. 2017

Toxins

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Botulinum toxin (BoNT) injections in the dystonic muscles is the preferred treatment for Cervical Dystonia (CD), but the proper identification of the dystonic muscles remains a challenge. Previous studies showed decreased 8–14 Hz autospectral power in the electromyography (EMG) of splenius muscles in CD patients. Cumulative distribution functions (CDF’s) of dystonic muscles showed increased CDF10 values, representing increased autospectral powers between 3 and 10 Hz, relative to power between 3 and 32 Hz. In this study, we evaluated both methods and investigated the effects of botulinum toxin. Intramuscular EMG recordings were obtained from the splenius, semispinalis, and sternocleidomastoid muscles during standardized isometric tasks in 4 BoNT-naïve CD patients, 12 BoNT-treated patients, and 8 healthy controls. BoNT-treated patients were measured 4–7 weeks after their last BoNT injections and again after 11–15 weeks. We found significantly decreased 8–14 Hz autospectral power in splenius muscles, but not in the semispinalis and sternocleidomastoid muscles of CD patients when compared to healthy controls. CDF10 analysis was superior in demonstrating subtle autospectral changes, and showed increased CDF10 values in all studied muscles of CD patients. These results did not change significantly after BoNT injections. Further studies are needed to investigate the origin of these autospectral changes in dystonia patients, and to assess their potential in muscle selection for BoNT treatment.

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Section: Discussionmentioning

confidence: 99%

Spectral EMG Changes in Cervical Dystonia Patients and the Influence of Botulinum Toxin Treatment

Nijmeijer

Bruijn

Verhagen

et al. 2017

Toxins

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“…The noise on all traces is reduced by a wavelet-based algorithm. It has been seen that the Daubechies 12 wavelet provides the best result for this kind of signal from previous studies 26 . Figure 2 demonstrates an entire trace from a healthy control recording and the result of noise reduction on the F-wave for this trace.…”

Section: Theory/calculationmentioning

confidence: 61%

“…One more control parameter was derived for approving candidates as repeater F-waves. It was named as ‘the similarity coefficient’ in a previous study 26 . The similarity coefficient consists of the sum of the amplitude difference and power difference values between the elements of a candidate pair.…”

Section: Theory/calculationmentioning

confidence: 99%

Fully automated F-wave corridor extraction and analysis algorithm for F-wave analyses and MUNE studies

Artuğ

2023

Sci Rep

Self Cite

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F-waves are used in motor unit number estimation (MUNE) studies, which require rapid dedicated software to perform calculations. The aim of this study is to define a mathematical method for a fully automated F-wave extraction algorithm to perform F-wave and MUNE studies while performing baseline corrections without distorting traces. Ten recordings from each class, such as healthy controls, polio patients and ALS patients, were included. Submaximal stimuli were applied to the median and ulnar nerves to record 300 traces from the abductor pollicis brevis and abductor digiti minimi muscles. The autocorrelation function and the signal of sum of all traces were used to find the location for the maximum amplitude of the F-waves. F-waves were revealed by using a cutting window. Linear line estimation was preferred for baseline corrections because it did not cause any distortion in the traces. The algorithm automatically revealed F-waves from all 30 recordings in accordance with the locations marked by a neurophysiologist. The execution of the algorithm was less than 2 (usually < 1) minutes when 300 traces were analyzed. Mean sMUP amplitudes and MUNE values are important for differentiating healthy controls from patients. Moreover, F-wave parameters belonging to polio patients on whom there was a relatively low number of studies conducted were also evaluated.

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“…As the protocol involved dynamic movements, it was expected that the skin movement has changed the sensor position relative to the innervation zone. In that way, the MMG signal could be contaminated as the EMG signal in some cases (Artuğ et al, 2016), although Malek and Coburn (2011) showed that the MMG signal is not contaminated by the innervation zone for time and frequency domains. Blangsted et al (2005) suggested that the increase in MMG RMS signal is due to the intramuscular pressure increase.…”

Section: Discussionmentioning

confidence: 99%

Correlation between spectral and temporal mechanomyography features during functional electrical stimulation

et al. 2016

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Introduction: Signal analysis involves time and/or frequency domains, and correlations are described in the literature for voluntary contractions. However, there are few studies about those correlations using mechanomyography (MMG) response during functional electrical stimulation (FES) elicited contractions in spinal cord injured subjects. This study aimed to determine the correlation between spectral and temporal MMG features during FES application to healthy (HV) and spinal cord injured volunteers (SCIV). Methods: Twenty volunteers participated in the research divided in two groups: HV (N=10) and SCIV (N=10). The protocol consisted of four FES profiles transcutaneously applied to quadriceps femoris muscle via femoral nerve. Each application produced a sustained knee extension greater than 65º up to 2 min without adjusting FES intensity. The investigation involved the correlation between MMG signal root mean square (RMS) and mean frequency (MF). Results: HV and SCIV indicated that MMG RMS and MMG MF variations were inversely related with -0.12 ≥ r ≥ -0.82. The dispersion between MMG MF and MMG RMS reached 0.50 ≤ r 2 ≤ 0.64. Conclusion: The increase in MMG RMS and the decrease in MMG MF may be explained by the motor units coherence during fatigue state or by motor neuron adaptation (habituation) along FES application (without modification on parameters).

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The effect of recording site on extracted features of motor unit action potential

Cited by 7 publications

References 27 publications

Spectral EMG Changes in Cervical Dystonia Patients and the Influence of Botulinum Toxin Treatment

Spectral EMG Changes in Cervical Dystonia Patients and the Influence of Botulinum Toxin Treatment

Fully automated F-wave corridor extraction and analysis algorithm for F-wave analyses and MUNE studies

Correlation between spectral and temporal mechanomyography features during functional electrical stimulation

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