Journal of Applied Physiology
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J Appl Physiol 82: 1370-1377, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 4, pp. 1370-1377, April 1997
EXERCISE AND MUSCLE

SPECIAL COMMUNICATION

Enhancement of signal quality in esophageal recordings of diaphragm EMG

Christer A. Sinderby1,2,3, Jennifer C. Beck1,2, Lars H. Lindström4, and Alejandro E. Grassino1,2

1 Meakins Christie Laboratories, McGill University, Montreal H2X 2P2; 2 Notre Dame Hospital, University of Montreal, Montreal, Quebec, Canada H2L 4M1; and 3 Spinal Injuries Unit and 4 Department of Medical Information Processing, Sahlgrenska Hospital, University of Göteborg, S-41345 Göteborg, Sweden

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.---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%.

electromyography; bipolar electrode filtering; power spectrum; center frequency; root mean square

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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