| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Meakins Christie
Laboratories,
Received 12 June 1996; accepted in final form 29 November 1996.
Sinderby, Christer A., Jennifer C. Beck, Lars H. Lindström, and Alejandro E. Grassino. Enhancement of signal
quality in esophageal recordings of diaphragm EMG. J. Appl. Physiol. 82(4): 1370-1377, 1997.
electromyography; bipolar electrode filtering; power spectrum; center frequency; root mean square
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
(EARdi) and the center of this region (EARdi ctr) 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
EARdi ctr, 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
EARdi ctr 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 of the
EARdi ctr 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 were accepted by the signal
quality indexes by 50%.
0161-7567/97 $5.00
Copyright © 1997 the American Physiological Society
This article has been cited by other articles:
|
|
 |
|
  K. E. Finucane and B. Singh Human diaphragm efficiency estimated as power output relative to activation increases with hypercapnic hyperpnea J Appl Physiol, November 1, 2009; 107(5): 1397 - 1405. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. K. McKenzie, J. E. Butler, and S. C. Gandevia Respiratory muscle function and activation in chronic obstructive pulmonary disease J Appl Physiol, August 1, 2009; 107(2): 621 - 629. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 L. Brander, H. Leong-Poi, J. Beck, F. Brunet, S. J. Hutchison, A. S. Slutsky, and C. Sinderby Titration and Implementation of Neurally Adjusted Ventilatory Assist in Critically Ill Patients Chest, March 1, 2009; 135(3): 695 - 703. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. J. Jolley, Y-M. Luo, J. Steier, C. Reilly, J. Seymour, A. Lunt, K. Ward, G. F. Rafferty, M. I. Polkey, and J. Moxham Neural respiratory drive in healthy subjects and in COPD Eur. Respir. J., February 1, 2009; 33(2): 289 - 297. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Sinderby, J. Beck, J. Spahija, M. de Marchie, J. Lacroix, P. Navalesi, and A. S. Slutsky Inspiratory Muscle Unloading by Neurally Adjusted Ventilatory Assist During Maximal Inspiratory Efforts in Healthy Subjects Chest, March 1, 2007; 131(3): 711 - 717. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. E. Finucane, J. A. Panizza, and B. Singh Efficiency of the normal human diaphragm with hyperinflation J Appl Physiol, October 1, 2005; 99(4): 1402 - 1411. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. Spahija, J. Beck, M. de Marchie, A. Comtois, and C. Sinderby Closed-Loop Control of Respiratory Drive Using Pressure-Support Ventilation: Target Drive Ventilation Am. J. Respir. Crit. Care Med., May 1, 2005; 171(9): 1009 - 1014. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
B. Singh, J. A. Panizza, and K. E. Finucane Diaphragm electromyogram root mean square response to hypercapnia and its intersubject and day-to-day variation J Appl Physiol, January 1, 2005; 98(1): 274 - 281. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. BECK, S. B. GOTTFRIED, P. NAVALESI, Y. SKROBIK, N. COMTOIS, M. ROSSINI, and C. SINDERBY Electrical Activity of the Diaphragm during Pressure Support Ventilation in Acute Respiratory Failure Am. J. Respir. Crit. Care Med., August 1, 2001; 164(3): 419 - 424. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. SINDERBY, J. SPAHIJA, J. BECK, D. KAMINSKI, S. YAN, N. COMTOIS, and P. SLIWINSKI Diaphragm Activation during Exercise in Chronic Obstructive Pulmonary Disease Am. J. Respir. Crit. Care Med., June 1, 2001; 163(7): 1637 - 1641. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. A. van Eykern, E. J. W. Maarsingh, W. M. C. van Aalderen, and S. Corne Two Similar Averages for Respiratory Muscle Activity J Appl Physiol, May 1, 2001; 90(5): 2014 - 2015. [Full Text] [PDF]
|
|
|
|
|
|
C. SINDERBY, J. SPAHIJA, and J. BECK Changes in Respiratory Effort Sensation Over Time Are Linked to the Frequency Content of Diaphragm Electrical Activity Am. J. Respir. Crit. Care Med., March 15, 2001; 163(4): 905 - 910. [Abstract] [Full Text]
|
|
|
|
|
|
C. Sinderby, J. Beck, J. Spahija, J. Weinberg, and A. Grassino Voluntary activation of the human diaphragm in health and disease J Appl Physiol, December 1, 1998; 85(6): 2146 - 2158. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Beck, C. Sinderby, L. Lindstrom, and A. Grassino Effects of lung volume on diaphragm EMG signal strength during voluntary contractions J Appl Physiol, September 1, 1998; 85(3): 1123 - 1134. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Beck, C. Sinderby, L. Lindstrom, and A. Grassino Crural diaphragm activation during dynamic contractions at various inspiratory flow rates J Appl Physiol, August 1, 1998; 85(2): 451 - 458. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| Visit Other APS Journals Online |
