Table 2:

Peak Exercise Data

	COPD	HFpEF	HFrEF	p-value
Workload (watts)	84 ± 35	40 ± 13*	40 ± 12*	<0.01
V̇O2 (mL/kg/min)	17 ± 4	8 ± 2*	9 ± 3*	<0.01
V̇O2 (% predicted)	59 ± 13	31 ± 9*	30 ± 8*	<0.01
V̇O2 (mL/min)	1516 ± 431	825 ± 220*	770 ± 203*	<0.01
V̇CO2 (mL/min)	1562 ± 551	860 ± 247*	756 ± 217*	<0.01
RER	1.01 ± 0.10	1.04 ± 0.13	1.07 ± 0.09	0.33
HR (beats/min)	130 ± 22	102 ± 14*	103 ± 26*	<0.01
V̇E (L/min)	53 ± 17	28 ± 9*	31 ± 9*	<0.01
Fb (breaths/min)	34 ± 5	28 ± 9*	28 ± 7*	<0.01
VT (L)	1.6 ± 0.5	1.0 ± 0.3*	1.1 ± 0.4*	<0.01
V̇E/V̇ O2	35 ± 6‡	34 ± 9‡	44 ± 12	<0.01
V̇E/V̇ CO2	35 ± 7‡	33 ± 6‡	41 ± 9	<0.01
Ti (s)	0.58 ± 0.10	0.75 ± 0.22*	0.85 ± 0.24*	<0.01
Te (s)	1.21 ± 0.22	1.62 ± 0.54	1.46 ± 0.80	0.07
Ti/Ttot	0.32 ± 0.05‡	0.32 ± 0.06‡	0.38 ± 0.07	<0.01
VT/Ti	2683 ± 614	1443 ± 409*	1354 ± 309*	<0.01
O2 saturation (%)	96 ± 3	94 ± 3	95 ± 4	0.15

Mean ± SD.

^*significantly different from COPD

^†significantly different from HFpEF

^‡significantly different from HFrEF