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. 2015 Jul 28;10(7):e0134182. doi: 10.1371/journal.pone.0134182

Fig 5. Representative example of Sigh (SIH).

Fig 5

The SIH highlighted in red has larger amplitude and longer duration than the other breaths. The horizontal dotted cursors in the ribcage (RCG) signal show an estimated variation of ± 90% of the amplitude of the breath preceding the SIH. Note that these cursors are not an exact amplitude reference. Also, the Lissajous plot shows an ellipse tilted to the right. ABD = abdomen, PPG = photoplethysmograph, SAT = blood oxygen saturation, a.u. = arbitrary units.