Table 2.

Forearm and systemic haemodynamics in young and older men: tyramine infusions (NA release)

	Adenosine		Exercise
Variable	Young	Older	Young	Older
FBF (ml min−1)
Baseline	34 ± 5	39 ± 6	35 ± 4	45 ± 9
Pre-tyramine	152 ± 31	151 ± 24	203 ± 21	188 ± 21
Post-tyramine	65 ± 14	90 ± 12	159 ± 16†	135 ± 15†
FVC (ml min−1 (100 mmHg)−1)
Baseline	38 ± 6	42 ± 7	39 ± 4	48 ± 9
Pre-tyramine	173 ± 35	161 ± 25	228 ± 23	196 ± 23
Post-tyramine	72 ± 15	94 ± 13	171 ± 17†	136 ± 16†
MAP (mmHg)
Baseline	90 ± 2	95 ± 3	90 ± 2	95 ± 3
Pre-tyramine	88 ± 2	95 ± 3	89 ± 2	97 ± 3
Post-tyramine	90 ± 2	97 ± 3	92 ± 2	100 ± 3*

^*P = 0.05 older versus young within same hyperaemic condition;

^†P < 0.05 exercise versus adenosine within same age group. FBF, forearm blood flow; FVC, forearm vascular conductance; MAP, mean arterial pressure.