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Titolo:
ENHANCEMENT OF SIGNAL QUALITY IN ESOPHAGEAL RECORDINGS OF DIAPHRAGM EMG
Autore:
SINDERBY CA; BECK JC; LINDSTROM LH; GRASSINO AE;
Indirizzi:
MCGILL UNIV,MEAKINS CHRISTIE LABS,3626 ST URBAIN ST MONTREAL PQ H2X 2P2 CANADA UNIV MONTREAL,NOTRE DAME HOSP MONTREAL PQ H2L 4M1 CANADA GOTHENBURG UNIV,SAHLGRENS HOSP,SPINAL INJURIES UNIT S-41345 GOTHENBURG SWEDEN GOTHENBURG UNIV,SAHLGRENS HOSP,DEPT MED INFORMAT PROC S-41345 GOTHENBURG SWEDEN
Titolo Testata:
Journal of applied physiology
fascicolo: 4, volume: 82, anno: 1997,
pagine: 1370 - 1377
SICI:
8750-7587(1997)82:4<1370:EOSQIE>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTROMYOGRAM; FATIGUE;
Keywords:
ELECTROMYOGRAPHY; BIPOLAR ELECTRODE FILTERING; POWER SPECTRUM; CENTER FREQUENCY; ROOT MEAN SQUARE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
C.A. Sinderby et al., "ENHANCEMENT OF SIGNAL QUALITY IN ESOPHAGEAL RECORDINGS OF DIAPHRAGM EMG", Journal of applied physiology, 82(4), 1997, pp. 1370-1377

Abstract

The crural diaphragm electromyogram (EMGdi) is recorded from a sheet of muscle, the fiber direction of which is mostly perpendicular to an esophageal bipolar electrode. The region from which the action potentials are elicited, the electrically active region of the diaphragm (EAR(di)) and the center of this region (EAR(dictr)) may vary during voluntary contractions in terms of their position with respect to an esophageal electrode. Depending on the bipolar electrode's position with respect to the EAR(dictr), the EMGdi is filtered to different degrees. The objectives of the present study were to reduce these filtering effects on the EMGdi by developing an analysis algorithm referred to as the''double-subtraction technique. '' The results showed that changes in the position of the EAR(dictr) by +/-5 mm with respect to the electrode pairs located 10 mm caudal and 10 mm cephalad provided a systematic variation in the EMG power spectrum center-frequency values by +/-10%. The double-subtraction technique reduced the influence of movement ofthe EAR(dictr) relative to the electrode array on EMG power spectrum center frequency and root mean square values, increased the signal-to-noise ratio by 2 dB, and increased the number of EMG samples that wereaccepted by the signal quality indexes by 50%.

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Documento generato il 05/07/20 alle ore 12:22:39