Table 4.
Systemic responses during ATP infusion
| Intrabrachial artery ATP infusion (nmol min−1) | ||||||
|---|---|---|---|---|---|---|
| Parameter | Conditions | 0 | 10 | 40 | 160 | 640 |
| Cardiac output (l min−1) | Control | 5.4 ± 0.7 | 5.3 ± 0.6 | 5.4 ± 0.8 | 5.4 ± 0.8 | 5.7 ± 0.6 |
| Heat stress | 5.5 ± 0.9 | 5.6 ± 0.9 | 5.7 ± 1.2 | 5.8 ± 0.9 | 6.2 ± 1.0* | |
| Heart rate (beats min−1) | Control | 56 ± 8 | 54 ± 8 | 54 ± 7 | 54 ± 9 | 56 ± 9 |
| Heat stress | 58 ± 8 | 58 ± 11 | 58 ± 11 | 59 ± 9 | 60 ± 8 | |
| Stroke volume (ml) | Control | 98 ± 21 | 101 ± 22 | 101 ± 20 | 102 ± 21 | 103 ± 20 |
| Heat stress | 98 ± 18 | 98 ± 20 | 100 ± 20 | 100 ± 20 | 102 ± 20 | |
| Mean arterial pressure (mmHg) | Control | 88 ± 4 | 90 ± 6 | 90 ± 8 | 89 ± 8 | 90 ± 6 |
| Heat stress | 88 ± 4 | 88 ± 4 | 88 ± 6 | 90 ± 5 | 89 ± 5 | |
| Systolic blood pressure (mmHg) | Control | 129 ± 5 | 134 ± 7 | 133 ± 8 | 133 ± 7 | 135 ± 4 |
| Heat stress | 126 ± 7 | 126 ± 6 | 128 ± 12 | 131 ± 9 | 129 ± 9 | |
| Diastolic blood pressure (mmHg) | Control | 68 ± 5 | 69 ± 6 | 69 ± 9 | 68 ± 8 | 69 ± 7 |
| Heat stress | 68 ± 4 | 68 ± 4 | 68 ± 5 | 70 ± 4 | 68 ± 6 | |
| Systemic vascular conductance | Control | 62 ± 10 | 60 ± 10 | 61 ± 14 | 61 ± 13 | 63 ± 10 |
| (ml min−1 mmHg−1) | Heat stress | 63 ± 12 | 63 ± 12 | 63± 13 | 64 ± 11 | 70 ± 12 |
Data are shown as means ± SD for seven or eight subjects. *Different from baseline (0), P < 0.05.