Hemodynamics and arterial properties in response to mental stress in individuals with mild hypertension.
OBJECTIVE
The role of tonic sympathetic stimulation on the properties of large arteries is largely unknown. The purpose of this study was to determine the effect of mental stress on hemodynamics and arterial properties in mild hypertensives.


METHODS
Twenty-three subjects with mild hypertension and 19 age-matched normotensives were compared to examine changes in hemodynamics and central arterial wave reflection before, during, and after mental stress.


RESULTS
The results demonstrate an acute effect of mental stress on blood pressure, heart rate, and arterial compliance. The static component (MBP) and the pulsatile (PP) component of arterial pressure increased significantly during mental stress and returned to baseline within a few minutes. Mild hypertensives did not have an increased response to mental stress. For both groups, an increase in HR and a consequent rise in CO were responsible for the increase in BP in response to mental stress. Compared with baseline, both groups demonstrated a decrease in arterial compliance during stress. Mental stress did not induce a significant change in total peripheral vascular resistance nor did it affect central arterial wave reflection in both groups. Individuals with mild hypertension demonstrated higher PP (p <.001), lower arterial compliance (p <.01), and higher AI (p <.05) than those with normal BP.


CONCLUSIONS
Hemodynamic and arterial responses to mental stress in individuals with normal BP and mild hypertension were similar. Several parameters, however, were different in basal state. These differences (ie, higher PP, lower compliance, and higher AI in the mild hypertensive group) could be due to the chronic effect of sympathetic stimulation on central arteries.
Tsai
Pei-Shan
PS
College of Nursing, University of Florida, Gainesville, Florida 32610-0187, USA. ptsai@tmu.edu.tw
Yucha
Carolyn B
CB
Nichols
Wilmer W
WW
Yarandi
Hossein
H
D000328:Adult; D001158:Arteries / Q000503:physiopathology*; D001794:Blood Pressure; D015992:Body Mass Index; D005260:Female; D006339:Heart Rate; D006439:Hemodynamics; D006801:Humans; D006973:Hypertension / Q000150:complications / Q000503:physiopathology* / Q000523:psychology; D008297:Male; D008875:Middle Aged; D011581:Psychological Tests; D013315:Stress, Psychological / Q000150:complications / Q000503:physiopathology*; D013564:Sympathetic Nervous System / Q000503:physiopathology; D014655:Vascular Resistance