Effects Of Different Intensity Aerobic Exercise On Cardiac Function And Exercise Endurance In Patients After Percutaneous Coronary Intervention

Objective:To investigate the effects of different intensity aerobic exercise on cardiac function and exercise endurance in patients after percutaneous coronary intervention (PCI).Methods:Sixty-five patients after PCI were randomly divided into high-intensity (80% of peak power) interval aerobic exercise group (n=20), moderate-intensity (60% of peak power) aerobic exercise group (n=20) and control group (n=20), high-intensity exercise training group performed by the mode of three minutes training separated by one minute of rest, ten sections every time,each time lasted forty minutes, moderate-intensity exercise group accepted forty minutes persistent training every time, all patients trained for twelve weeks, three times a week, before and after training,all patients received echocardiography and cardiopulmonary exercise testing (CPET) to assess their cardiac function and exercise endurance.Results:Before training, three groups of patients had no significant difference (p>0.05) in left ventricular ejection fraction (LVEF), peak power (PP), exercise duration (ED), peak oxygen uptake (VO2peak) and anaerobic threshold (AT); after training, there were significant differences (p<0.05) between high-intensity exercise group and moderate-intensity exercise group in PP, ED, VO2peak, and were better than control group (p<0.05); moderate-intensity exercise group and control group had no significant difference in LVEF (p> 0.05), but there were significant differences (p<0.05) to high-intensity exercise group; only high-intensity group was significantly higher than control group (p<0.05) in AT. Conclusion:1. High-intensity interval aerobic exercise and continuous moderate-intensity aerobic exercise can both increase peak power, exercise duration and peak oxygen uptake of patients after percutaneous coronary intervention,improve their exercise tolerance,and compared with continuous moderate intensity aerobic exercise, the effect of high-intensity interval aerobic exercise is more significant.2. High intensity interval aerobic exercise can improve left ventricular ejection fraction of patients after percutaneous coronary intervention,in other words,it can improve patients cardiac function, but continuous moderate-intensity aerobic exercise had no significant effects on patients’ left ventricular ejection fraction.3. High intensity interval aerobic exercise can improve anaerobic threshold of patients after percutaneous coronary intervention, make patients with higher levels of aerobic metabolism ability, but the effect of continuous moderate-intensity aerobic exercise is not obvious,and there was no significant difference between them.4. for patients treated with percutaneous coronary intervention, with 80% of peak power as a exercise load of high intensity interval aerobic exercise is tolerable, and it’s safe and effective.