Table 2.

Post-BT changes in cardiopulmonary function assessed at THR during CPET

	Pre-BT	3 months after BT	1 year after BT
Dyspnea, Borg scale	7	4	4
HR response, %	105	109	103
Exercise time, min	9.6	14.5	15.5
${\dot{\text{V}}}_{{\text{O}}_2}$, mL min−1 kg−1	26.0	25.7	25.0
${\dot{\text{V}}}_{\text{E}}$, L min−1	79.4	75.4	75.3
ΔFO2, %	2.97	3.09	3.04
VTex, mL	2412	2495	2559
VT in − VTex, mL	6	23	− 64
fR, breaths min−1	32.9	30.2	29.4
Ti/Ttot	0.39	0.37	0.39
VD/VTex	0.28	0.28	0.27
${\dot{\text{V}}}_{\text{E}}/{\dot{\text{V}}}_{{\text{O}}_2}$	41	41	41
${\dot{\text{V}}}_{\text{E}}/{\dot{\text{V}}}_{{\text{CO}}_2}$	38	35	36
SpO2, %	91	96	94
AT, mL min−1	1147	1277	1230

AT anaerobic threshold obtained by the V-slope method, BT bronchial thermoplasty, CPET cardiopulmonary function testing, ΔFO₂ the inspired oxygen concentration (FiO₂) minus the expired oxygen concentration (FeO₂), ex expiratory, f_R breathing frequency, HR heart rate, in inspiratory, SpO₂ oxygen saturation, Ti/Ttot the ratio of inspiratory time to total breathing cycle time, THR target heart rate = 220 − age (years), ${\dot{V}}_{C{O}_2}$ carbon dioxide output, V_D/V_Tex physiologic dead space/tidal volume ratio, ${\dot{V}}_E$ minute ventilation, ${\dot{V}}_{O_2}$ oxygen uptake, V_T tidal volume