Table 2.

Steady-state physiological measurements at rest and during low- and moderate-intensity leg cycling in young and older subjects

	SBP, mmHg	DBP, mmHg	MAP, mmHg	Pulse Pressure, mmHg	Heart Rate, beats/min	MCAVmean, cm/s	CVCi, cm·s−1·mmHg−1	PaCO2, mmHg
Rest
Young	120±3	74±1	90±1	45±3	65±3	60±4	0.66±0.04	44±1
Older	123±3	81±2*	95±2	46±6	61±3	64±2	0.67±0.03	43±1
Low Ex
Young	137±5	70±1	92±2	67±5	96±3†	64±3	0.70±0.04	44±2
Older	151±4*†	82±2*	105±2*†	69±4	90±3†	68±2	0.65±0.02	43±1
Moderate Ex
Young	160±4†‡	68±3†	99±2†‡	92±5	123±3†‡	66±2	0.67±0.03	43±1
Older	182±4*†‡	86±3*	118±2*†‡	96±4	112±3*†‡	65±2	0.56±0.02*†‡	41±1
P value
Group	0.012	<0.001	<0.001	0.870	0.097	0.478	0.180	0.355
Condition	<0.001	0.664	<0.001	<0.001	<0.001	0.021	0.001	0.003
Interaction	0.002	0.006	<0.001	0.290	0.005	0.244	0.001	0.942

Values are means ± SE. SBP, systolic blood pressure; DBP, diastolic blood pressure; MAP, mean arterial pressure; MCAV_mean, middle cerebral artery mean blood velocity; CVCi, cerebral vascular conductance index; Pa_CO2, estimated arterial carbon dioxide tension; Ex, exercise.

^*Significantly different from young (P < 0.05).

^†Significantly different from rest (P < 0.05).

^‡Significantly different from Low Ex (P < 0.05).