Comparison of Myocardial Oxygen Demand and Rate of Perceived Exertion According to the Modes of Exercise in Ischemic Heart Disease. |
Kim, Chul , Kim, Young Joo |
Department of Rehabilitation Medicine, Inje University College of Medicine, Korea. christian6801@hanmail.net |
허혈성 심장병에서 운동방법에 따른 심근산소요구량 및 운동자각도 비교 |
김철, 김영주 |
인제대학교 의과대학 재활의학교실 |
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Abstract |
Objective To investigate the changes of myocardial oxygen demand and rate of perceived exertion (RPE) during treadmill or bicycle exercise in patients with ischemic heart disease. Method 73 consecutive male patients who were referred to cardiac rehabilitation unit after taking coronary angioplasty were selected. All patients took exercise test by modified Bruce protocol and exercise intensity were prescribed by Karvonen's formula. On the first day of exercise, patients performed exercise by treadmill or bicycle with 60% heart rate reserve for 24 minutes, and on the second day of exercise, mode of exercise was switched with same intensity. On the third day, patients performed treadmill or bicycle exercise with 85% heart rate reserve for 24 minutes and also switched on the fourth day. Heart rate, blood pressure, and Borg's RPE were recorded on 2 minutes before exercise termination during all 4 days. Results Blood pressure was higher in bicycle exercise than treadmill, and there was no significant difference in the change rate of blood pressure between 60% and 85% heart rate reserves. Myocardial oxygen demand and RPE were also higher in patients exercised on bicycle exercise than treadmill at 60% and 85% heart rate reserves. With the intensity of 85% heart rate reserve, RPE was higher in bicycle exercise (15, hard) than treadmill (13, somewhat hard). Conclusion In patient with ischemic heart disease, bicycle exercise at 85% heart rate reserve might be heavy burden during the early cardiac rehabilitation. (J Korean Acad Rehab Med 2009; 33: 572-577) |
Key Words:
Bicycle, Exercise, Myocardial ischemia, Rehabilitation, Treadmill |
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