Table 2.

Hemodynamic and gas exchange variables during the cerebrovascular reactivity to hypercapnia test

	Sham		IMST
	Baseline	Posttesting	Baseline	Posttesting
Normocapnia
MCAv, cm/s	25.5 ± 6.8#	31.1 ± 3.8#	49.5 ± 17.6	45.2 ± 14.3
CVCi, cm/s/mmHg	0.27 ± 0.07#	0.30 ± 0.04	0.49 ± 0.22	0.43 ± 0.17
MCA pulsatility index, AU	1.46 ± 0.82	1.27 ± 0.70	1.14 ± 0.39	1.00 ± 0.18
MAP, mmHg	108 ± 6	106 ± 6	108 ± 12	108 ± 14
$\text{P}\text{E}{\text{T}}_{{\text{CO}}_2}$, mmHg	36.0 ± 3.9	38.6 ± 2.9	37.5 ± 1.7	37.1 ± 5.1
Hypercapnia
MCAv, cm/s	37.4 ± 6.3#	42.5 ± 8.0#	61.8 ± 23.1	63.3 ± 16.6
CVCi, cm/s/mmHg	0.34 ± 0.08#	0.38 ± 0.06#	0.57 ± 0.25	0.55 ± 0.20
MCA pulsatility index, AU	1.29 ± 0.64	1.04 ± 0.34	0.98 ± 0.28	0.87 ± 0.15
MAP, mmHg	115 ± 6	114 ± 10	113 ± 11	117 ± 15*
$\text{P}\text{E}{\text{T}}_{{\text{CO}}_2}$, mmHg	45.4 ± 3.4	46.4 ± 2.8	46.3 ± 1.9	45.5 ± 3.4

Values are means ± SD. Data were collected with participants in the semirecumbent position. MCAv, middle cerebral artery blood velocity; CVCi, cerebrovascular conductance index; AU, arbitrary units; MAP, mean arterial pressure; $\text{P}\text{E}{\text{T}}_{{\text{CO}}_2}$, end-tidal pressure of carbon dioxide. Statistics are 2-way repeated-measures ANOVA with Fisher’s least significant difference post hoc analysis. *P < 0.05 vs. within-group baseline; #P < 0.05 vs. inspiratory muscle strength training (IMST) at matched time point.