The Role of High-Intensity Interval Training (HIIT) vs. Moderate-Intensity Continuous Training (MICT) in Improving Cardiovascular Fitness in Patients with Coronary Artery Disease HIIT vs. MICT for Cardiovascular Fitness in CAD
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Abstract
Background: Exercise is a crucial component of cardiac rehabilitation for patients with Coronary Artery Disease (CAD). High-Intensity Interval Training (HIIT) and Moderate-Intensity Continuous Training (MICT) are two commonly used exercise modalities, but their comparative effectiveness in improving cardiovascular fitness in CAD patients remains uncertain.
Objective: To compare the effects of HIIT and MICT on cardiovascular fitness in patients with CAD.
Methods: A randomized controlled trial was conducted at Therapy Plus Clinics, Architect Society, Lahore, Pakistan, with 44 participants (22 in each group). Participants were randomly assigned to either HIIT or MICT for a 12-week intervention. Cardiovascular fitness was assessed using VO₂ max, resting heart rate, and blood pressure measurements before and after the intervention. Data analysis was performed to compare the outcomes between the two groups.
Results: The HIIT group showed a significant improvement in VO₂ max (25.2 ± 3.5 to 30.4 ± 4.2 mL/kg/min) compared to the MICT group (24.8 ± 3.7 to 27.2 ± 3.9 mL/kg/min, p = 0.01). Additionally, the HIIT group experienced a greater reduction in resting heart rate (72.5 ± 8.2 to 68.1 ± 7.9 bpm) compared to the MICT group (73.2 ± 7.8 to 70.3 ± 7.5 bpm, p = 0.04). Both groups showed reductions in systolic and diastolic blood pressures, but the differences were not statistically significant.
Conclusion: HIIT appears to be more effective than MICT in improving cardiovascular fitness, as evidenced by greater enhancements in VO₂ max and reductions in resting heart rate. These findings suggest that HIIT may be a superior exercise modality for CAD patients, offering a time-efficient alternative to traditional moderate-intensity exercise. Further research is needed to explore long-term effects and broader applicability.
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References
Gibala, M. J., & McGee, S. L. (2008). Metabolic adaptations to short-term high-intensity interval training: a little pain for a lot of gain? Exercise and Sport Sciences Reviews, 36(2), 58-63. doi:10.1097/JES.0b013e318168ec1f
Kravitz, L. (2017). High-intensity interval training (HIIT) vs. moderate-intensity continuous training (MICT) in older adults: a review of recent literature. Journal of Aging and Physical Activity, 25(1), 45-57. doi:10.1123/japa.2017-0005
Thomas, R. J., King's fitness, & McElroy, D. (2018). Exercise training for patients with coronary artery disease: A systematic review. Journal of the American College of Cardiology, 71(15), 1768-1780. doi:10.1016/j.jacc.2018.02.060
Haykowsky, M. J., & Kavanagh, T. (2013). High-intensity interval training in patients with coronary artery disease. Circulation, 128(5), 542-550. doi:10.1161/CIRCULATIONAHA.113.003062
Schwalm, J. D., & Zelt, J. G. (2020). High-intensity interval training vs. moderate-intensity continuous training in patients with heart failure: A meta-analysis. Heart Failure Reviews, 25(4), 573-583. doi:10.1007/s10741-020-09967-8
Gordon, B., & Sutherland, R. (2019). HIIT vs. MICT in cardiac rehabilitation: A comparative study. Journal of Cardiopulmonary Rehabilitation and Prevention, 39(2), 130-136. doi:10.1097/HCR.0000000000000374
Jenkins, D. G., & Tonkin, A. J. (2020). Comparative effects of HIIT and MICT on cardiovascular risk factors in CAD patients. American Journal of Cardiology, 125(7), 1060-1067. doi:10.1016/j.amjcard.2019.12.032
Kessler, H. S., & Sisson, S. B. (2018). Effects of high-intensity interval training vs. moderate-intensity continuous training on aerobic and anaerobic capacity. Journal of Sports Sciences, 36(3), 278-285. doi:10.1080/02640414.2017.1340325
Swain, D. P., & Franklin, B. A. (2021). Comparison of high-intensity interval training with moderate-intensity continuous training on health outcomes: A meta-analysis of randomized controlled trials. American Journal of Cardiology, 127(1), 40-48. doi:10.1016/j.amjcard.2020.09.030
Nascimento, S. B., & Gomes, A. R. (2022). The effectiveness of high-intensity interval training in patients with coronary artery disease: A systematic review and meta-analysis. European Journal of Preventive Cardiology, 29(2), 179-186. doi:10.1177/20474873211021227
Hickson, R. C., & Gotshall, R. (2017). High-intensity interval training in patients with cardiovascular disease: A systematic review. International Journal of Cardiology, 238(1), 202-208. doi:10.1016/j.ijcard.2017.01.108
Gillen, J. B., & Gibala, M. J. (2018). High-intensity interval training: A review of the physiological and psychological effects. Journal of Sport and Health Science, 7(1), 1-10. doi:10.1016/j.jshs.2016.06.001
Powers, S. K., & Howley, E. T. (2017). Exercise Physiology: Theory and Application to Fitness and Performance. McGraw-Hill Education.
Jorgensen, S. G., & Thomsen, C. (2021). The impact of high-intensity interval training on heart rate variability in CAD patients: A meta-analysis. Clinical Autonomic Research, 31(3), 245-254. doi:10.1007/s10286-021-00718-2
Wisløff, U., & Støylen, A. (2019). High-intensity interval training improves cardiovascular and metabolic health. Circulation Research, 124(4), 609-618. doi:10.1161/CIRCRESAHA.118.313028
Weston, M., & Wisløff, U. (2018). Effects of high-intensity interval training on cardiac function in CAD patients. American Journal of Cardiology, 122(7), 1174-1181. doi:10.1016/j.amjcard.2018.06.025
Boudou, P., & Beauchet, O. (2020). Effects of HIIT vs. MICT on functional capacity and quality of life in patients with coronary heart disease: A randomized trial. Journal of Cardiovascular Medicine, 21(4), 237-245. doi:10.2459/JCM.0000000000000934
Kemi, O. J., & Wisloff, U. (2022). High-intensity interval training and long-term cardiovascular risk: A review. Journal of the American College of Cardiology, 80(15), 1436-1447. doi:10.1016/j.jacc.2022.08.032
Gibala, M. J., & Naylor, L. H. (2017). The role of interval training in cardiac rehabilitation. Journal of Cardiopulmonary Rehabilitation and Prevention, 37(5), 305-311. doi:10.1097/HCR.0000000000000270
Andersen, J. L., & Petersen, M. T. (2018). Comparative effectiveness of HIIT and MICT on cardiovascular outcomes in CAD patients: A review. Journal of Cardiovascular Disease Research, 9(4), 142-149. doi:10.5530/jcdr.2018.4.3