Abbas Ali Gaeini - Professor of Exercise Physiology, School of Physical Education, University of Tehran, Tehran, Iran
Sadegh satarifard - PhD Student of Exercise Physiology, School of Physical Education, University of Tehran, Tehran, Iran
Mohammad Reza Kordi - Associated Professor of Exercise Physiology, School of Physical Education, University of Tehran, Tehran, Iran
Ali Heidary - MSc of Exercise Physiology, School of Physical Education, University of Tehran, Tehran, Iran

Background: High-intensity interval training is a new training method that has been less explored in patients. Aim: The purpose of this study was to compare the effect of eight weeks of interval training with continuous training on changes in HRR and lipid profile in cardiac patients post-coronary artery bypass graft. Methods: In this clinical study, 30 cardiac patients of Tehran Heart Centerthat hadundergone CABG surgery were randomly divided into two groups, interval and continuous training. The protocols included 4rep × 4 min at 90-95% for interval group, and 60-80 minutes at 70-85% peak HR for continuous group. HRmax, HRR at 1, 2 and 3 min following Bruce test was assessed before and after the training program. The collected data were analyzed using SPSS software version 16 and ANOVA test (p<0.05). Results: HRR at 1 & 2 minute was reduced more in both interval and continuous groups than that of before the training program (p<0.05). The HHR reduction at 1&2 minutes was more significant in the interval group than the continuous group after exercise stress test (p<0.05). The changes in HRR at 3 min in both groups were not significant compared to that of before the training program (p=0.1). Conclusion: Both high-intensity interval training and moderate-intensity continuous training improve HRR and lipid profile in cardiac patients after coronary artery bypass. Interval training is more effective on HHR reduction than continuous training.  

Interval training, HHR, lipid profile, Cardiac patients Post- CABG