OBJECTIVES: Frail subjects with chronic heart failure (CHF) often demonstrate limited tolerance of exertion, shortness of breath, and reduced walking capacity resulting poor quality of life (QoL). The aim of this study was to quantify the improvements in functional exercise capacity (FEC) and QoL among Bulgarian frail subjects with CHF performed group-based high-intensity aerobic interval training (HIAIT)/m-Ullevaal intervention and to compare it with moderate intensity continuous training (MICT) protocol. METHODS: One hundred and twenty (n = 120) frail subjects with mean age of 63.73 +/- 6.68 years, in CHF and NYHA class II to IIIB, were enrolled in the single-center, prospective, two-arm randomized controlled clinical trial conducted at the Medical Center for Rehabilitation and Sports Medicine-I-Plovdiv. The baseline assessment included 6-minute walk test (6Î?WT), peak oxygen uptake (VO2peak), modified Borg Perceived Exertion Scale (mBPES), and Minnesota living with the Heart Failure Questionnaire (MLHFQ). RESULTS: The improvement in 6MWT (p < 0.001), VO2peak (p < 0.001), mBPES (p < 0.001), and MLHFQ (p < 0.001) observed among frail subjects performed HIAIT/m-Ullevaal intervention was significantly greater compared to the improvement observed in the subjects performed MICT protocol (p < 0.001). CONCLUSIONS: The group-based HIAIT/m-Ullevaal intervention is a new perspective and challenge for both, Bulgarian cardiac rehabilitation (CR), and frail patients with CHF.

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