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1 Meakins Christie Laboratories, McGill University, and Notre Dame Hospital, University of Montreal, Montreal, Quebec, Canada H2L 4M1; and 2 Spinal Injuries Unit, Sahlgrenska Hospital, University of Göteborg, Göteborg, Sweden
Received 16 April 1996; accepted in final form 18 September 1996.
Beck, Jennifer, Christer Sinderby, Lars Lindström, and
Alex Grassino. Diaphragm interference pattern EMG and compound muscle action potentials: effects of chest wall configuration. J. Appl. Physiol. 82(2): 520-530, 1997.
The effect of chest wall configuration on the diaphragm
electromyogram (EMGdi) was evaluated in five healthy subjects with an
esophageal electrode for both interference pattern EMGdi (voluntary
contractions) and electrically evoked diaphragm compound muscle action
potentials (CMAPs). Diaphragm CMAPs (both unilateral and bilateral)
were evaluated for the baseline-to-peak amplitude (Ampl), the time from
the onset of the CMAP to first peak (T1), root mean square (RMS), and
center frequency (CF) values of the CMAP power spectrum. CF values from
the interference pattern EMGdi power spectrum were also calculated. For
CMAPs obtained at an electrode position least influenced by variations
induced by electrode positioning, Ampl increased with diaphragm
shortening from functional residual capacity (FRC) to total lung
capacity (TLC) by 101 and 98% (unilateral and bilateral,
respectively). Bilateral CMAP RMS values increased 116% from FRC to
TLC. CMAP T1 values decreased with diaphragm shortening from FRC to TLC by 1.1 and 2.1 ms for the unilateral and bilateral stimulations, respectively, and CF increased for the bilateral diaphragm CMAPs with
diaphragm shortening. CF values from the interference pattern EMGdi did
not show any consistent change with chest wall configuration. Thus CF
values of the interference pattern EMGdi obtained with an esophageal
electrode can be considered reliable for physiological interpretation,
at any diaphragm length (if electrode positioning and signal
contamination are controlled for), contrary to the diaphragm CMAPs,
which are sensitive to changes in chest wall configuration. It is
speculated that the different results (over the effects of chest wall
configuration on interference pattern EMGdi and diaphragm CMAPs) may be
because of summation properties of the signals and how these influence
the EMG power spectrum.
spectral analysis; esophageal electrode; cross-correlation; crural diaphragm; phrenic nerve stimulation
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