TABLE 3.

Measures of systolic and diastolic middle cerebral artery velocity and the calculated pulsatility index, and minute ventilation volume during incremental running and cycling

	Rest	35% VO2max	50% VO2max	65% VO2max	80% VO2max	95% VO2max
Running
sMCAv (cm/s)	99.7 ± 18.3	121.5 ± 22.3* †	133.0 ± 23.9* †	144.5 ± 25.3* †	139.2 ± 31.2* †	141.4 ± 32.2 * †
dMCAv (cm/s)	46.5 ± 9.8	44.2 ± 11.3	40.5 ± 12.4* †	33.2 ± 12.5* †	34.9 ± 12.0* †	37.3 ± 13.4* †
PI (cm/s)	0.82 ± 0.10	1.09 ± 0.16* †	1.28 ± 0.27* †	1.51 ± 0.28* †	1.41 ± 0.23* †	1.36 ± 0.26* †
VE (L/min)	10.2 ± 2.9*	26.4 ± 4.8*	40.0 ± 7.1* †	57.2 ± 11.2* †	77.3 ± 15.3* †	99.6 ± 20.5*
Cycling
sMCAv (cm/s)	97.7 ± 19.2	113.1 ± 20.7* †	124.3 ± 21.3* †	130.1 ± 21.4* †	127.3 ± 20.4* †	121.7 ± 21.2* †
dMCAv (cm/s)	45.8 ± 8.6	46.2 ± 9.8	48.2 ± 9.8†	49.0 ± 10.0†	46.7 ± 10.4†	44.2 ± 11.9†
PI (cm/s)	0.81 ± 0.11	0.96 ± 0.15* †	1.03 ± 0.13* †	1.07 ± 0.12* †	1.10 ± 0.16* †	1.11 ± 0.22* †
VE (L/min)	9.9 ± 4.6*	24.8 ± 4.7*	36.5 ± 7.5* †	51.2 ± 9.5* †	69.6 ± 13.0* †	96.5 ± 22.1*

Data are mean ± SD for 26 participants.

dMCAv, diastolic middle cerebral artery velocity; PI, pulsatility index; sMCAv, systolic middle cerebral artery velocity; V_E, Minute ventilation.

^*Significantly different from resting values (p < .05).

^†Significantly different between modalities (p < .05).