Table 1.
Carotid baroreflex–HR stimulus–response curve parameters
| Derived variable | Rest | Control exercise | Epidural anaesthesia exercise |
|---|---|---|---|
| Dynamic exercise | |||
| Response range (beats min−1) | 15 ± 1 | 14 ± 1 | 15 ± 3 |
| Max. gain (beats min−1 mmHg−1) | −0.4 ± 0.1 | −0.3 ± 0.1 | −0.4 ± 0.1 |
| Centring point (mmHg) | 92 ± 6 | 122 ± 8† | 111 ± 7† |
| Minimum response (beats min−1) | 56 ± 4 | 93 ± 3† | 95 ± 7† |
| Threshold (mmHg) | 66 ± 6 | 92 ± 9† | 87 ± 11† |
| Saturation (mmHg) | 112 ± 6 | 146 ± 8† | 135 ± 5† |
| Operating point (mmHg) | 87 ± 2 | 94 ± 3 | 94 ± 3 |
| Static exercise | |||
| Response range (beats min−1) | 17 ± 3 | 23 ± 3 | 22 ± 3 |
| Max. gain (beats min−1 mmHg−1) | −0.5 ± 0.1 | −0.7 ± 0.1 | −0.6 ± 0.1 |
| Centring point (mmHg) | 99 ± 9 | 122 ± 10† | 107 ± 9* |
| Minimum response (beats min−1) | 50 ± 2 | 68 ± 4† | 69 ± 2† |
| Threshold (mmHg) | 64 ± 6 | 100 ± 9† | 87 ± 9*† |
| Saturation (mmHg) | 118 ± 11 | 145 ± 12† | 127 ± 9* |
| Operating point (mmHg) | 89 ± 3 | 118 ± 9† | 97 ± 5* |
Values are means ± S.E.M.
*
Significantly different from control exercise
†
significantly different from rest.