Letter by Wisløff et al Regarding Article, “High-Intensity Interval Training in Patients With Heart Failure With Reduced Ejection Fraction”
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To the Editor:
In a clinical setting, high-intensity exercise is found to be an effective way to improve cardiorespiratory fitness,1 and several studies have shown that exercise using high-intensity interval training (HIIT) in comparison with moderate-intensity continuous training (MICT) is more effective for improving health outcomes, including cardiac adaptations. We acknowledge the SMARTEX Heart Failure Study (Study of Myocardial Recovery After Exercise Training in Heart Failure) Group for their recent study2 aiming to translate experience and findings from a small-scale study3 into a multicenter setting. The conclusion was that a 12-week program of HIIT was not superior to MICT in changing left ventricular remodeling or cardiorespiratory fitness in patients …