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. 2013 Apr 23;2013:743504. doi: 10.1155/2013/743504

Figure 2.

Figure 2

Effect of breathing techniques on estimated chemoreflex sensitivity values (*P < 0.05; **P < 0.01; ***P < 0.001, versus spontaneous breathing; ¶¶¶ P < 0.001, versus 6/min (3 s inspiration + 7 s expiration)).