Helena Santa-Clara1, Ana Abreu2, Xavier Melo3,4, Vanessa Santos1, Pedro Cunha2, Mário Oliveira2, Rita Pinto1, Miguel Mota Carmo2,5, Bo Fernhall6. 1. Faculdade de Motricidade Humana, CIPER, Centro Interdisciplinar de Estudo da Performance Humana, Universidade de Lisboa, Sala 8, Pavilhão Lord, Estrada da Costa, Cruz Quebrada, 1499-002, Lisbon, Portugal. 2. Departamento de Cardiologia, Centro Hospitalar de Lisboa Central, Hospital Santa-Marta, Rua de Santa Marta 50, 1169-024, Lisbon, Portugal. 3. Faculdade de Motricidade Humana, CIPER, Centro Interdisciplinar de Estudo da Performance Humana, Universidade de Lisboa, Sala 8, Pavilhão Lord, Estrada da Costa, Cruz Quebrada, 1499-002, Lisbon, Portugal. xaviermelo@fmh.ulisboa.pt. 4. GCP Lab, Praça Ginásio Clube Português n.1, Ginásio Clube Português, 1250-111, Lisbon, Portugal. xaviermelo@fmh.ulisboa.pt. 5. Faculdade de Ciências Médicas, CEDOC, Centro de Estudos de Doenças Crónicas, Universidade Nova, Campo Mártires da Pátria, 130, 1169-056, Lisbon, Portugal. 6. Integrative Physiology Laboratory, College of Applied Health Sciences, University of Illinois at Chicago, 808 South Wood Street CMET 169, MC 518, Chicago, IL, 60612, USA.
Abstract
AIMS: To determine the effects of high-intensity interval training (HIIT) following cardiac resynchronization therapy (CRT) implantation in patients with chronic heart failure (CHF), on noninvasive estimates of systolic ventricular function, exercise performance, severity of symptoms and quality of life. METHODS:Cardiopulmonary exercise testing, resting transthoracic echocardiogram and health-related quality of life assessment were obtained before and at 6 months after CRT implantation in 37 patients with moderate-to-severe CHF. Patients were randomized after CRT to either a 24-week HIIT group (90-95% peak heart rate, 2 days per week) or to a usual care group (CON). Mixed design 2 × 2 repeated measures ANOVA were used to test for differences within and in-between groups. RESULTS: Improvements in health-related quality of life (HIIT = 98.54%, CON = 123.47%), NYHA class (HIIT = 43.44%, CON = 38.30%) HR recovery at minute 1 (HIIT = 32.32%, CON = 42.94%), pulse pressure at peak effort (HIIT = 14.06%, CON = 9.52%, LVEF (HIIT = 42.17%, CON = 51.10%) and LV Mass (HIIT = 13.26%, CON = 11.88%) were similar in both groups (p > 0.05). Significant increases in CPET duration in the HIIT group (25.94%), and increases in peak VO2 (HIIT = 8.64%, CON = 4.85%) and percent-predicted VO2 (HIIT = 10.57%, CON = 4.26%) in both groups, were observed in the intention-to-treat analysis. CONCLUSION: Six months of HIIT in patients in CRT did not further improved indices of functional capacity and health-related quality of life, and LV structure and function, compared to CRT alone. However, HIIT led to further improvements in exercise performance. It remains unclear whether HIIT benefits patients in CRT to a similar degree as more conventional forms of exercise training previously shown to maximize benefits in CRT. CLINICAL TRIAL REGISTRATION: http://www.clinicaltrials.gov . Unique identifier: NCT02413151.
RCT Entities:
AIMS: To determine the effects of high-intensity interval training (HIIT) following cardiac resynchronization therapy (CRT) implantation in patients with chronic heart failure (CHF), on noninvasive estimates of systolic ventricular function, exercise performance, severity of symptoms and quality of life. METHODS: Cardiopulmonary exercise testing, resting transthoracic echocardiogram and health-related quality of life assessment were obtained before and at 6 months after CRT implantation in 37 patients with moderate-to-severe CHF. Patients were randomized after CRT to either a 24-week HIIT group (90-95% peak heart rate, 2 days per week) or to a usual care group (CON). Mixed design 2 × 2 repeated measures ANOVA were used to test for differences within and in-between groups. RESULTS: Improvements in health-related quality of life (HIIT = 98.54%, CON = 123.47%), NYHA class (HIIT = 43.44%, CON = 38.30%) HR recovery at minute 1 (HIIT = 32.32%, CON = 42.94%), pulse pressure at peak effort (HIIT = 14.06%, CON = 9.52%, LVEF (HIIT = 42.17%, CON = 51.10%) and LV Mass (HIIT = 13.26%, CON = 11.88%) were similar in both groups (p > 0.05). Significant increases in CPET duration in the HIIT group (25.94%), and increases in peak VO2 (HIIT = 8.64%, CON = 4.85%) and percent-predicted VO2 (HIIT = 10.57%, CON = 4.26%) in both groups, were observed in the intention-to-treat analysis. CONCLUSION: Six months of HIIT in patients in CRT did not further improved indices of functional capacity and health-related quality of life, and LV structure and function, compared to CRT alone. However, HIIT led to further improvements in exercise performance. It remains unclear whether HIIT benefits patients in CRT to a similar degree as more conventional forms of exercise training previously shown to maximize benefits in CRT. CLINICAL TRIAL REGISTRATION: http://www.clinicaltrials.gov . Unique identifier: NCT02413151.
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