Correlation between Vascular Compliance and Increase of Blood Pressure on Exercising in Normotensive Group

Abstract

Background and Objectives:Vascular compliance is known to be decreased in hypertension, even at an early stage. The blood pressure response to exercise reflects the future risk of developing hypertension. A study was performed on the relationship between the vascular compliance and blood pressure response to exercise, to evaluate whether the vascular compliance is decreased in normotensive persons with a relatively higher future risk of developing hypertension. Subjects and Methods:The subjects of the study were adults with normal blood pressure (SBP<120 mmHg, DBP<80 mmHg), who had undergone health screening and both echocardiography and treadmill test. Those patients with a history of diabetes mellitus or clinical cardiovas- cular diseases were excluded form the subjects. An index of overall vascular compliance (SVI/PP) was cal- culated using echocardiography. The relationship between the peak systolic blood pressure during exercise and vascular compliance was also investigated. Results:The subjects were 77 patients, 54 male and 23 female, with a mean age of 47.6±7.7 years. The measured vascular compliance and average of peak systolic pressure on exercising were 1.08±0.24 L/m 2 /mmHg and 154±21 mmHg, respectively. The peak systolic pressure was correlated with the vascular compliance (r=-0.24, p<0.05). The peak systolic pressure at stage 3 was also correlated with the vascular compliance (r=-0.24, p<0.05). This relationship persisted after adjustment for age, gender, basal systolic blood pressure and maximal oxygen consumption (p<0.05). Conclusion:The vas- cular compliance was lower in subjects with a larger increase in blood pressure during exercise whose basal blood pressure was even below 120/80 mmHg. This finding may suggest that a decreased vascular compliance precedes the changes of hypertension. A longitudinal follow-up study is warranted. (Korean Circulation J