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KMID : 1023920140160030097
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Journal of the Korean Academy of Kinesiology
2014 Volume.16 No. 3 p.97 ~ p.106
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Hemodynamic Response to Exercise in Young Aged Men with Essential Hypertensives
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Park Ji-Yeon
Jung Joo-Ha
Moon Da-Hae
Yang Jum-Hong
Park Jung-Jun
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Abstract
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PURPOSE: The purpose of this study was to examine hemodynamic response to exercise in young pre- and hypertensives, and to determine whether it is necessary for the proper exercise prescription.
METHOD: The subjects were 17 men, including 9 pre- or hypertensives (HTN) and 8 normotensives (NT), age 20 to 28 years. All subjects completed graded exercise test (GXT) with cycle ergometer to measure O2max. For hemodynamic test, blood pressure (BP) was measured by mercury sphygmomanometer and cardiac output (CO) was measured by non-invasive CO2 rebreathing method at rest and during 40%, 60% of O2max. Stroke volume (SV), total peripheral resistance (TPR), cardiac index (CI) and rate-pressure product (RPP) was calculated by using BP, HR, and CO. Data were analyzed by independent t-test and two way ANOVA with repeated measures. The statistical significant was p< .05.
RESULT: Systolic blood pressure (SBP) and mean arterial pressure (MAP) were significantly higher in HTN than NT at rest and during exercise, while diastolic blood pressure (DBP) and heart rate (HR) were not statistically different between groups. Among hemodynamic parameters, CO was significantly higher at rest in HTN compared with NT, while TPR was similar between groups. During exercise, however, there were no significant differences in CO and TPR between groups. On the other hand, RPP was significantly higher in HTN than NT at rest and during exercise.
CONCLUSION: During exercise, an increase in BP is larger in HTN than NT, but an increase in CO and decrease in TPR are not different between groups. RPP is higher in HTN than NT at rest and during exercise, especially reached to nearly dangerous level. These results suggest that it is important to consider increases in not only blood pressure, but also cardiac workloads during exercise as setting the intensity of exercise prescription for young pre- and hypertensives.
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KEYWORD
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essential hypertensive, blood pressure, cardiac output, hemodynamic, rate-pressure product
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