. Author manuscript; available in PMC: 2018 May 22.

Published in final edited form as: Respir Med. 2014 Dec 18;109(4):463–474. doi: 10.1016/j.rmed.2014.12.002

Table 2.

Response to maximal exercise.

	Healthy	CF
FVC (L)	4.6 ± 0.9	4.0 ± 1.2
FVC (% predicted)	100 ± 9	96 ± 30
FEV₁ (L)	3.8 ± 0.9	2.9 ± 1.1^*
FEV₁ (% predicted)	99 ± 12	83 ± 28
FEV₁/FVC (%)	84 ± 4	73 ± 10^*
FEF_25–75 (L/sec)	4.0 ± 1.2	2.4 ± 1.4^*
FEF_25–75 (% predicted)	96 ± 26	60 ± 30^*

CF = cystic fibrosis; HR = heart rate; VO₂ = oxygen consumption; VCO₂ = carbon dioxide production; RER = respiratory exchange ratio; RPE = rating of perceived exertion; RR = respiratory rate; V_T = tidal volume; V_E = minute ventilation; SpO₂ = peripheral oxygen saturation. Data are present as mean ± SD.

p < 0.025 vs. healthy.