Dosage strategies of hiit and their influence on vo2max in patients with heart failure: A systematic review

Abstract

Introduction: High intensity interval training HIIT is an effective strategy in cardiac rehabilitation, significantly improving aerobic capacity. However, lack of clarity regarding optimal dosing limits its clinical application. Objectives: To evaluate and determine the optimal dosage of high-intensity interval training HIIT to improve Vo2max in patients with heart failure. Methods: A search was carried out in 5 databases (PubMed, Scopus, Web of Science, Cochrane Library and Embase). Studies that used the HIIT protocol and measured Vo2max were included. And they compared HIIT with MICT, SID or some strength program in patients with HF. Results: 7 studies were analyzed that included a total of 625 participants with left ventricular ejection fraction LVEF between 35% and 50%. The findings indicate that HIIT is more effective in improving Vo2max than other methods. HIIT offers flexibility in intensity, frequency, duration and work intervals. A minimum of 3 weekly sessions is recommended for at least 6 weeks, with intensity greater than 85%, active recovery at 40-50% of Vo2max, work intervals of 30 seconds followed by recovery, 4-7 series per session and a time total of 25 minutes minimum per session. These guidelines may optimize physiological adaptations to training in patients with heart failure. Conclusion: The findings of the systematic review support the effectiveness of HIIT as an exercise training option for patients with HF.