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. 2016 May 9;11(5):e0155084. doi: 10.1371/journal.pone.0155084

Fig 4. Respiratory frequency (Fres), time of inspiration (Ti), percentage contribution of rib cage to total lung volume (%RC), phase angle, time shift, and linear correlation coefficient between rib cage (RC) and abdomen (AB) volume waveforms of classical singers and untrained individuals during each of the three tasks assessed.

Fig 4

Mean + SEM are shown. * P < 0.05, ** P < 0.001 vs. untrained individuals. † P < 0.05, †† P < 0.001 vs. quiet breathing.