ABC | Volume 111, Nº5, November 2018

Original Article Lima et al High-intensity interval training and heart failure Arq Bras Cardiol. 2018; 111(5):699-707 Figure 2 – Brachial artery diameter pre- and post-high-intensity interval training session. Data are expressed as mean± standard deviation. Lines represent individual values. Probability value indicates within-group significant differences. 6 5.5 5 4.5 4 3.5 3 2.5 Baseline Follow-up p < 0.01 Brachial artery diameter (mm) Table 4 – Exercise protocol variables Variables Moderate intensity High Intensity HR (bpm) 98 ± 19 113 ± 24 BORG 13 ± 2 16 ± 2 Speed (km/h) 3 ± 0.3 4.9 ± 0.8 Incline (%) 0.9 ± 0.9 5.5 ± 1.9 Values are described as mean ± standard deviation. HR: heart rate; BORG: scale of perceived exertion. Table 5 – Brachial artery diameters and variations pre- and post-high-intensity interval training session. Variables Pre Post p Brachial artery diameter (mm) 3.96 ± 0.57 4.33 ± 0.69 < 0.01 Brachial artery diameter post-hyperemia (mm) 4.19 ± 0.61 4.47 ± 0.66 < 0.05 Absolute FMD (mm) 0.23 ± 0.20 0.13 ± 0.26 0.177 Relative FMD (%) 5.91± 5.20 3.55 ± 6.59 0.162 Brachial artery diameter pre-NTG (mm) 4.11 ± 0.65 4.16 ± 0.68 0.528 Brachial artery diameter post-NTG (mm) 4.57 ± 0.65 4.52 ± 0.64 0.541 Absolute NTG (mm) 0.46 ± 0.17 0.35 ± 0.20 0.106 Relative NTG (%) 11.4 ± 4.4 9.0 ± 5.37 0.117 Values are described as mean ± standard deviation. FMD: flow-mediated dilatation; NTG: nitroglycerin. Conclusion One single HIIT session promoted an increase in brachial artery diameter and a reduction in systolic BP, and did not change FMD and diastolic BP 30 minutes after the exercise session. Author contributions Conception and design of the research: Lima JB, Silveira AD, Zanini M, Nery RM, Stein R; Acquisition of data: Lima JB, Silveira AD, Saffi MAL, Menezes MG, Piardi DS, Ramm LDCR; Analysis and interpretation of the data: Lima JB, Saffi MAL, Menezes MG, Piardi DS, Ramm LDCR, Stein R; Statistical analysis: Lima JB; Writing of the manuscript: Lima JB, Silveira AD, Stein R; Critical revision of the manuscript for intellectual content: Lima JB, Silveira AD, Saffi MAL, Zanini M, Nery RM, Stein R. Potential Conflict of Interest No potential conflict of interest relevant to this article was reported. Sources of Funding Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) e Fundo de Incentivo à Pesquisa e Eventos (FIPE) do Hospital de Clínicas de Porto Alegre (HCPA). Study Association This article is part of the thesis of master submitted by Juliana Beust de Lima, from Universidade Federal do Rio Grande do Sul. 704