관상 동맥 질환 환자의 수중 및 지상 트레드밀 운동시 최고 심호흡계 반응

Abstract

Objective: To investigate cardiorespiratory responses during exercise s using an aquatic treadmill and a land-based treadmill in coronary artery disease (CAD) patients. Methods: Twenty-one stable CAD patients were enrolled. All patients participated in two symptom-limited incremental exercise s using either an aquatic or a land treadmill. For the aquatic treadmill protocol, patients were submerged in 28 °C water to the upper waist. The treadmill speed was started at 2.0 km/h, and increased 0.5 km/h every minute thereafter. For the land treadmill protocol, the speed and gradient were started at 2.4 km/h and 1.5 %, respectively; the speed was increased by 0.3 km/h and grade by 1 % every minute thereafter. Oxygen consumption (VO2), heart rate (HR), and respiratory exchange ratio (RER) were measured continuously and peak values were recorded. The rating of perceived exertion (RPE) was recorded, and the percentage of age-predicted maximal HR and total exercise duration were measured. Results: The peak cardiorespiratory responses during both protocols were compared and the peak VO2 and peak HR did not show any significant differences. The peak RER was significantly greater in the land treadmill than in the aquatic treadmill protocol. The RPE, the percentage of age-predicted maximal HR and total exercise duration were similar for both protocols. The linear relationship between HR and VO2 during both protocols was highly significant. Conclusion: This study demonstrated that aquatic treadmill exercise elicits similar peak cardiorespiratory responses as land treadmill exercise, suggesting that aquatic treadmill exercise may be effective for cardiac rehabilitation in CAD patients.

Keywords: coronary artery disease, cardiopulmonary exercise test, water, rehabilitation, treadmill.