Abstract
The purpose of this study was to compare the acute cardiorespiratory responses and time spent above different %VO2peak intensities between three “iso-work” protocols: (a) a high intensity interval training protocol (HIIT), (b) a higher intensity continuous protocol (CON70) and (c) a lower intensity continuous protocol (CON50) in patients with chronic heart failure (CHF). Ten male CHF patients (aged 55.1 ± 16.2 years) performed in separate days a single session of a HIIT protocol consisted of 4 sets × 4 min cycling at 80% VO2peak with 3 min of recovery at 50% VO2peak, a CON70 protocol corresponding to 70% VO2peak and a CON50 protocol corresponding to 50% VO2peak. Cardiopulmonary data were collected by an online gas analysis system. The HIIT and CON70 elicited higher cardiorespiratory responses compared to CON50 with no differences between them (p > 0.05). In HIIT and CON70, patients exercised longer at >80% and >90% VO2peak. The completion rate was 100% for the three protocols. Not any adverse events were observed in either protocol. Both HIIT and CON70 elicited a stronger physiological stimulus and required shorter time than CON50. Both HIIT and CON70 also induced comparable hemodynamic responses and ventilatory demand.
Highlights
Accepted: 24 November 2021Chronic heart failure (CHF) is a complex clinical syndrome with a prevalence of more than 23 million people globally [1]
A potential benefit from high intensity interval training (HIIT), shown to be safe as moderate intensity continuous training (MCT) [6,7], is that more time is spent at high intensities and this greater stimulus may lead to better cardiovascular adaptations [8]
The main findings were that HIIT and CON70 elicited higher cardiorespiratory responses compared to CON50 with significantly less exercise time
Summary
Accepted: 24 November 2021Chronic heart failure (CHF) is a complex clinical syndrome with a prevalence of more than 23 million people globally [1]. Pharmacological tool, which leads to ventilatory, cardiovascular, skeletal muscle and neurohormonal adaptations that benefit CHF patients [2]. These adaptations lead to an improvement in exercise capacity and health-related quality of life. It has been suggested that in order to increase VO2peak , exercise intensity is an important determinant in cardiac patients [5]. In order to achieve that, high intensity interval training (HIIT) has gained popularity in cardiac rehabilitation in recent years. A potential benefit from HIIT, shown to be safe as moderate intensity continuous training (MCT) [6,7], is that more time is spent at high intensities and this greater stimulus may lead to better cardiovascular adaptations [8]
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