The study of left ventricular hypertrophy in ECG and QT dispersion in marathon runner with exercise-induced hypertension.

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doi:2015.24.2.117

Exerc Sci > Volume 24(2); 2015 > Article

Exercise Science 2015;24(2): 117-123. doi: https://doi.org/10.15857/ksep.2015.24.2.117

운동유발성 고혈압 마라톤주자의 심전도상 좌심실 비대와 QT분산에 관한 연구

박순철¹, 오재근¹, 김영주²

¹한국체육대학교
²상계백병원

The study of left ventricular hypertrophy in ECG and QT dispersion in marathon runner with exercise-induced hypertension.

ABSTRACT

PURPOSE:
The purpose of this study was to compare and analyze left ventricular hypertrophy(LVH) and QT dispersion which have been known as unpredictable causes of sudden death, among Exercise-Induced Hypertension(EIH).
METHODS:
Normal Hypertension Group and Control Group in middle age-marathoners. Total 48 healthy male marathoners(EIH: 16, NG: 16, Con: 16) were participated in this research. Quinton stress test system was used to measure Left Ventricular Hypertrophy(LVH) and QT dispersion. Graded exercise test was executed by treadmill.
RESULTS:
LVH in EIH and Normal group(NG) was significantly greater than in Control group(CON)(p<.001, p<.01). Heart rate in EIH and NG during recovery phases(2 min. and 3 min.) was more lower than in CON(p<.001, p<.01) and heart rate of EIH at recovery 5 min. is lower than in CON(p<.05). The systolic blood pressure at rest, EIH was greater than in NG and CON(p<.05, p<.01). The systolic blood pressure of EIH at maximal, was higher than in the other groups and NG was also greater than in CON(p<.001, p<.001, p<.05). The systolic blood pressure of EIH at recovery 2 was higher than in the other groups and NG was also greater than in CON(p<.01, p<.001, p<.05). At recovery 3 min., systolic blood pressure of EIH was higher than in the others and NG was significant greater than in CON(p<.05, p<.001, p<.01). Systolic blood pressure in EIH at recovery 5 min. was higher than in NG and CON(p<.01, p<.001). Cardiopulmonary function in EIH and NG were significantly greater compared to CON(p<.001). QT dispersion of EIH at rest was significantly higher than in CON(p<.05). There were no differences among the groups at recovery phases(2 min., 3 min. and 5 min.).
CONCLUSIONS:
In EIH group, systolic blood pressure and QT dispersion that could have a negative effect on cardiovascular diseases is significantly greater than CON at rest. So this study could suggest that negative factors in middle-aged male marathoners with EIH have been found. Further researches will be necessary for identifying an effect of continuous high intensity exercise on cardiovascular system.

Key words: middle-aged men, marathon, exercise induced hypertension(EIH), left ventricular hypertrophy, QT dispersion, ECG