Bilaterally synchronized oscillations in human diaphragm and intercostal EMGs during spontaneous breathing

Bilaterally synchronized high-frequency oscillations have been found in recordings of human diaphragm and intercostal EMGs during spontaneous breathing (SB). Correlated frequencies (28-52 and/or 68-88 Hz) in the left and right diaphragm EMGs during SB: (1) are at similar values, but not as broad-band, as those found during voluntary breathing maneuvers; (2) often occur at the same values as correlated frequencies found in left and right intercostal EMGs; and (3) fluctuate with time.