. 2017 Jan 31;17:26. doi: 10.1186/s12890-017-0364-z

Table 2.

Peak exercise response in healthy participants and in patients with emphysema and IPF

	Healthy	Emphysema	IPF
Peak $\dot{V}$ _O2 (l · min⁻¹)	2.66 ± 0.70	1.35 ± 0.13^a	1.41 ± 0.13^ab
Peak $\dot{V}$ O₂ (l · kg^-0.66 · min⁻¹)	2.06 ± 0.62	1.04 ± .023^a	1.06 ± 0.33^a
GET (l · min⁻¹)	1.48 ± 0.50	0.80 ± 0.11^a	0.95 ± 0.15^a
GET (%)	56 ± 12	57 ± 4	67 ± 7
Peak HR (b · min⁻¹)	177 ± 12	142 ± 17^*	142 ± 31^a
Time to Exhaustion (min)	12.9 ± 3.2	9.5 ± 0.8	11.7 ± 3.5

Mean ± S.D. $\dot{V}$ O₂: oxygen uptake; GET: gas exchange threshold. ^aSignificant difference relative to healthy participants (P < 0.05) ^bSignificant difference between emphysema and IPF patients