TABLE 3. Comparison of the measures of PIN, PImaxS, potency, volume and training index for each group in the pre and postoperative period. Values expressed as mean and standard deviation.

		GPP (n=23)	GCI (n=22)
		Pre Post	Pre Post
PIN (cmH20) p	M DP	86.80 75.75 ±16.35 ±19.80 0.018*	87.15 80.55 ±15.14 ±19.38 0.128
PImáxS (cmH20) p	M DP	38 33.5 ±8.94 ±5.87 0.009*	42 38.5 ±10.56 ±8.13 0.2
POTENCY (W) p	M DP	2.99 2.33 ±1.19 ±1.05 0.03*	3.11 2.65 ±1.23 ±1.31 0.07
VOLUME (L) p	M DP	2.03 1.09 ±3.31 ±0.32 0.04*	1.4 1.0 ±0.43 ± 0.26 0.03*
IT (%prev) p	M DP	66.2 56.5 ±31.4 ±40.1 0.3	80.65 78.1 ±18.0 ±27.51 0.7

GPP=positive pressure group; GCI=inspiratory loading group; n=number of subjects; pre=preoperative; post=postoperative; PIN=nasal inspiratory pressure; CmH₂0=centimeters of water; PImaxS=sustained maximum inspiratory pressure; W=watt; L=liter; IT=training index; % prev=percentage of predicted; M=average; SD=standard deviation; * significant difference between the pre and postoperative periods=p<0.05