The effect of High-intensity interval training and Moderate-intensity steady-state on VO2peak and lipid profile of coronary artery bypass graft in the second phase of cardiac rehabilitation

Document Type : Research Paper

Authors

1 Department of Sports Physiology, Faculty of Sports Sciences, Bu Ali Sina University, Hamadan, Iran

2 Faculty of Rehabilitation, Hamadan University of Medical Sciences

3 Department of Molecular Medicine, Faculty of Modern Medical Technologies, University of Medical Sciences, Hamadan, Iran

10.22080/jaep.2024.26936.2175

Abstract

Objectives: Increasing aerobic capacity reduces mortality in heart patients. Exercise is highly recommended to improve VO2peak and lipid indices. But there is little evidence about the most effective method of exercise training for coronary artery disease patients. This study aims to investigate the effect of high intensity interval training (HIIT) compared to moderate steady-state training (MISS) on improving VO2peak and fat indices in coronary bypass patients.
Methods: In this semi-experimental study, 40 CABG patients were randomly divided into four groups, control, HIIT of 20 seconds (80-100% of maximal aerobic power (MAP)), HIIT of 60 seconds (80-100% MAP), MISS (60-80 % MAP). The training groups trained three times a week with a treadmill, manual ergometer, and leg ergometer for eight weeks, and the control group had no regular physical activity. VO2peak and fat profile were measured before and after eight weeks. Data were analyzed using one-way ANOVA and paired t-test (p≤0.05).

Result: After 8 weeks of intervention, VO2peak increased by 15.1% in HIIT20 group (P=0.018), 18.3% in HIIT60 group (P=0.011), and 11.6% in MISS group (P=0.041). HDL significantly increased only in the HIIT groups (P≤0.05). LDL decreased significantly in all exercise groups (P≤0.05). TG decreased significantly in the HIIT groups (P≤0.05). TC decreased significantly in the HIIT60 and MISS groups (P≤0.05).

Conclusion: HIIT exercises have a better performance compared to MISS exercises for improving VO2peak and some lipid indices in coronary bypass patients. This better performance was associated with equal rate perceive exertion and safety with MISS exercises.

Keywords

Journal of Applied Exercise Physiology
Volume 19, Issue 37
March 2023
Pages 7-8

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History

  • Receive Date: 29 March 2024
  • Revise Date: 13 May 2024
  • Accept Date: 31 May 2024

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