Abstract 14462: The Same Level of Brachial Systolic Blood Pressure Causes Much Stronger Cardiac Load for Older Than Younger People
The Same Level Of Brachial Systolic Blood Pressure Causes Much Stronger Cardiac Load For Older Than Younger People.
Background:Brachial systolic blood pressure (bSBP) has been used as the evaluation of the cardiac load at the exercise stress test. However, central systolic blood pressure (cSBP) during exercise is thought to be a more direct measure of cardiac load. Purpose: The purpose of this study is to determine the difference between bSBP and cSBP immediately after exercise stress test from young to old people.
Methods: Treadmill exercise stress test was performed in 105 patients who were divided into 3 groups by age, younger group(n=35,mean age 48±14y.o.), middle group(n=35,mean age 63±6 y.o) and older group(n=35,mean age 72±4y.o.). Patients were exercised to achieve 85% of age predicted max heart rate or symptoms limited using Bruce protocol. bSBP and cSBP were measured by HEM-9000AI (Omron Healthcare,Japan) at rest and immediately after exercise.
Result: bSBP and cSBP at rest were 136±13 and 132±15mmHg(HR 74±10bpm) with younger group, 136±13 and 138±14mmHg(HR 70±10bpm) with middle group, 138±15 and 140±21mmHg(HR 71±12bpm) with older group. bSBP and cSBP at rest of 3 groups were not significant difference. bSBP immediately after exercise was 170±17mmHg(HR 109±14bpm) with younger group,170±18mmHg(HR 104±14bpm) with middle group and 171±19mmHg(HR 103±17bpm) with older group, it was also not significant difference. However, cSBP immediately after exercise was 141±17mmHg with younger group, 149±21mmHg with middle group and 159±20mmHg with older group. Figure shows that cSBP immediately after exercise of older group was just significantly higher than that of younger group (P<0.01).
Conclusion: Even if bSBP shows the same level, central systolic pressure of older people after exercise is higher. Therefore older people have a higher cardiac load after exercise, which is not readily assessed by bSBP.
- © 2012 by American Heart Association, Inc.