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Effect of high-intensity interval versus continuous exercise training on functional capacity and quality of life in patients with coronary artery disease: a randomized clinical trial
Villelabeitia Jaureguizar K, Vicente-Campos D, Ruiz Bautista L, de la Pena CH, Arriaza Gomez MJ, Calero Rueda MJ, Fernandez Mahillo I
Journal of Cardiopulmonary Rehabilitation and Prevention 2016 Mar-Apr;36(2):96-105
clinical trial
5/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

PURPOSE: There is strong evidence that exercise training has beneficial health effects in patients with cardiovascular disease. Most studies have focused on moderate continuous training (MCT); however, a body of evidence has begun to emerge demonstrating that highintensity interval training (HIIT) has significantly better results in terms of morbidity and mortality. The aim of this study was to compare the effects of MCT versus HIIT on functional capacity and quality of life and to assess safety. METHODS: Seventy-two patients with ischemic heart disease were assigned to either HIIT or MCT for 8 weeks. We analyzed cardiopulmonary exercise test data, quality of life, and adverse events. RESULTS: High-intensity interval training resulted in a significantly greater increase in VO2peak (4.5 +/- 4.7 mL/kg/min compared with MCT (2.5 +/- 3.6 mL/kg/min) (p < 0.05). The aerobic threshold (VT1) increased by 21% in HIIT and 14% in MCT. Furthermore, there was a significant (p < 0.05) increase in the distance covered in the 6-minute walk distance test in the HIIT group (49.6 +/- 6.3 m) when compared with the MCT group (29.6 +/- 12.0 m). Both training protocols improved quality of life. No adverse events were reported in either of the groups. CONCLUSIONS: On the basis of the results of this study, HIIT should be considered for use in cardiac rehabilitation as it resulted in a greater increase in functional capacity compared with MCT. We also observed greater improvement in quality of life without any increase in cardiovascular risk.
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