Fig. 1

Sample of unfiltered EMG data. Top curve (“P3”) shows the pressure/flow signal, indicating inspiratory and expiratory flow. The following 5 curves show the raw EMG per set of leads for the diaphragm and the intercostal muscles. Bottom 5 show amplitudes of these raw signals. To obtain these data, electrodes are positioned bilaterally on the chest wall, on the mid-axillary and midclavicular lines just below the costal margins. The intercostal electrodes are positioned on the mid-clavicular line as well. Changes in electrical currents are measured in between a pair of electrodes, with a reference electrode positioned on the sternum. Currents flowing from the two right and left sided electrodes were labeled aR Dia and aL Dia, those in between the electrodes on the midclavicular line aF Dia, and those placed laterally aD Dia. The final data combined the signals from left and right