email article High-intensity interval training (HIIT) did not beat traditional exercise in raising exercise capacity for sedentary patients with heart failure with preserved ejection fraction (HFpEF), according to the OptimEx-Clin trial. HIIT and moderate continuous training groups yielded similar improvements in peak oxygen consumption (VO 2) from baseline to 3 months (+1.1 vs +1.6 mL/kg/min) -- both too modest to meet a prespecified minimal clinically-important threshold in comparison with controls (-0.6 mL/kg/min). Neither HIIT nor traditional exercise remained associated with improved exercise capacity at 12 months compared with controls, who got no supervised exercise training, only guideline-directed advice on physical activity, reported Martin Halle, MD, of the Technical University of Munich, Germany, and colleagues online in