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BIBTEX RIS

Effects Of High Intensity Interval Vs. Moderate Continuous Training On Markers Of Ventilatory And Cardiac Efficiency In Coronary Heart Disease Patients

2015; Lippincott Williams & Wilkins; Volume: 47; Issue: 5S Linguagem: Inglês

10.1249/01.mss.0000478898.64350.a0

ISSN

1530-0315

Autores

Gustavo Gonçalves Cardozo, Ricardo B. Oliveira, Luísa Ribeiro de Meirelles, Rita de Cássia Castelli da Rocha, Paulo Farinatti,

Tópico(s)

Cardiovascular and exercise physiology

Resumo

PURPOSE: High intensity interval training (HIIT) has been shown to be more effective than moderate intensity continuous training (MIT) for improving cardiorespiratory fitness in patients with coronary heart disease (CHD). Whether HIIT would be more effective than MIT to improve newly emerged markers, such as the relationship between ventilation and carbon dioxide production (VE/VCO2 slope), oxygen uptake efficiency slope (OUES), and oxygen pulse (O2P) is not known. We tested the hypothesis that improvement in these markers would be higher after HIIT vs. MIT in patients with CHD. METHODS: Seventy-one patients with optimized treatment underwent maximal exercise testing and were randomly assigned into HIIT (n=23, age=56±12years), MIT (n=24, age=62±12years), or non-exercise control group (CG) (n=24, age=64±12years). MIT performed 30 min of continuous aerobic exercise at 70-75% of maximal heart rate (HRmax), and HIIT performed 30-min sessions split in 2-min alternate bouts at 60%/90% HRmax. Both protocols were performed 3 times/week for 16 weeks. RESULTS: No baseline differences were observed among groups in demographic or medical history data, including age, body mass index, aerobic capacity, ejection fraction, and prevalence of risk factors. VE/VCO2slope slightly decreased in trained groups (MIT= -4%, P=0.11 and HIIT= -1%, P=0.74) and increased in CG (+2%, P=0.33). OUES increased in HIIT (+11%, P=0.03) and decreased in MIT (-4%, P=0.17) and CG (-11%, P<0.001). Improvement in O2Pslope was higher in HIIT vs. MIT and CG (22% vs. -5%, P=0.24 and vs. -28%, P=0.004, respectively) and in MIT vs. CG (P=0.18) (Figure 1). CONCLUSION: HIIT was more effective than MIT for improving O2P slope in patients with CHD, while VE/VCO2slope and OUES after exercise improved similarly in both exercise-training groups compared to controls.

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