RESUMO
Sixteen unanesthetized immature Macaca fascicularis monkeys, 18-43 months of age, were tested for mean arterial blood pressure (MBP) and heart rate (HR) responses to 30 minutes of continuous broadband noise (95 dB). Eight animals (OH group) were offspring of monkeys with high blood pressure (parents' MBP = 115.5 +/- 1.0 (SEM) mmHg), and eight (OC group) were offspring of control animals with normal blood pressure (parents' MBP = 96.6 +/- 1.7 mmHg). Resting MBP during a 17-24 hour period prior to the experiment in the OH group was 100.6 +/- 1.9 mmHg, significantly higher (p less than 0.05) than the MBP of the OC group (94.3 +/- 2.2 mmHg.) Immediately prior to noise exposure, MBP in the OH group was stable for 30 minutes, at 104 +/- 3 mmHg. During noise exposure, MBP increased significantly to 108 +/- 4 mmHg. In the OC group, MBP during the 30 min baseline interval was 95 +/- 2 mmHg, and during noise exposure was not significantly changed at 94 +/- 3 mmHg. Heart rate decreased significantly during noise in the OC group and did not change in the OH group. The results indicate that the offspring of monkeys with high blood pressure had higher resting MBP than control animals and showed significant MBP increases in response to loud noise. Control animals showed no change in MBP and decreases in HR in response to noise.
