Nombre: LETICIA NASCIMENTO SANTOS NEVES
Fecha de publicación: 30/10/2023
Junta de examinadores:
Nombre |
Papel |
|---|---|
| CARLOS AUGUSTO KALVA FILHO | Examinador Externo |
| CLÁUDIA LÚCIA DE MORAES FORJAZ | Examinador Externo |
| DANILO SALES BOCALINI | Examinador Interno |
| LUCIANA CARLETTI | Presidente |
| RICHARD DIEGO LEITE | Examinador Interno |
Sumario: Introduction: A novel proposal of High-Intensity Interval Training (HIIT) with elastic resistance (EL-HIIT) has been under investigation. EL-HIIT is easy to apply and accessible; however, its efficacy and safety in terms of acute responses still need to be studied. Objective: To compare the cardiopulmonary and blood pressure responses after a single session of two types of high-intensity interval training (EL-HIIT vs. HIIT on the treadmill) in healthy young individuals. Methods: Twenty-two participants underwent two incremental tests, the Cardiopulmonary Exercise Test (CPET) and the Elastic Cardiopulmonary Exercise Test (ECPET), with a one-week interval between them. Subsequently, they performed a session of HIIT on the treadmill (10 x 1:1 min at 85-90% V O2max from CPET), and after a one-week interval, a session of EL-HIIT (10 x 1:1 min at 85-90% V O2max). The Student's t-test was used to compare peak and mean values of the HIIT and EL-HIIT sessions. ANOVA and Mixed-Effects Model of Repeated Measures (Bonferroni/Tukey post-hoc) were used to compare HIIT, EL-HIIT, and control (for heart rate variability - HRV and blood pressure - BP). Cohen's d effect size was used to compare the sessions. To assess inter and intra-individual BP, MDD (minimum detectable difference), ICC (intra-class correlation coefficient), CV (coefficient of variation), SEM (standard error of measurement), and ET (typical error) were used. Results: In the EL-HIIT session, heart rate (HR), ventilation (V E), oxygen consumption (V O2), carbon dioxide production (V CO2), and RPE were higher than in the HIIT session (P < 0.05). Comparing HIIT and EL-HIIT, no differences were found when analyzing each interval during the session. In recovery, there was a decrease in systolic blood pressure (SBP) for both EL-HIIT and HIIT, but of greater magnitude in EL-HIIT, as calculated by MDD, at 50, 70, and 80 minutes post-exertion compared to control (P < 0.05). The intra-individual analyses of systolic and diastolic blood pressure showed ICC of 0.92 and 0.88, CV of 6.0 and 9.5%, and MDD of 4.1 and 4.3, respectively. EL-HIIT presented higher sympathetic autonomic variables (stress index, SNS index) compared to HIIT/control and lower parasympathetic autonomic variables (RMSSD, pNN50, PNS index) compared to HIIT/control after exertion (P < 0.05). Conclusion: A single session of EL-HIIT promoted a greater magnitude of post-exercise hypotension compared to HIIT. EL-HIIT presented higher autonomic stress in recovery compared to HIIT without changes in nitrite/nitrate concentrations.
