BACKGROUND: Smoking affects the autonomic function. OBJECTIVE: To investigate the acute effects of smoking on the autonomic modulation and the post-smoking recovery of the heart rate variability (HRV) index through Poincaré plot and linear indices. METHODS: A total of 25 young smokers underwent beat-to-beat analysis of heart rate in the sitting position after 8 hours of tobacco abstinence, for 30 minutes at rest, 20 minutes while smoking and 30 minutes after smoking. The analysis of variance for repeated measures, followed by Tukey's test or Friedman's test followed by Dunn's test, were applied depending on the normality of data, with p < 0.05. RESULTS: While smoking, there was a decrease in the indices: SD1 (23.4 ± 9.2 vs 13.8 ± 4.8), SD1/SD2 ratio (0.31 ± 0.08 vs 0.2 ± 0.04), RMSSD (32,7 ± 13 vs 19.1 ± 6.8), SDNN (47.6 ± 14.8 vs 35.5 ± 8.4), HFnu (32,5 ± 11.6 vs 19 ± 8.1) and the RR interval (816.8 ± 89 vs 696.5 ± 76.3) in relation to the rest period, whereas increases in the LFnu index (67.5 ± 11.6 vs 81 ± 8.1) and the LF/HF ratio (2.6 ± 1.7 vs 5.4 ± 3.1) were observed. The visual analysis of the plot showed a lower dispersion of RR intervals while smoking. Except for the SD1/SD2 ratio, the other indices presented recovery of values 30 minutes after smoking. CONCLUSION: Smoking resulted in acute modifications of the autonomic control, characterized by sympathetic activation and vagal withdrawal, presenting recovery 30 minutes after smoking.
BACKGROUND: Smoking affects the autonomic function. OBJECTIVE: To investigate the acute effects of smoking on the autonomic modulation and the post-smoking recovery of the heart rate variability (HRV) index through Poincaré plot and linear indices. METHODS: A total of 25 young smokers underwent beat-to-beat analysis of heart rate in the sitting position after 8 hours of tobacco abstinence, for 30 minutes at rest, 20 minutes while smoking and 30 minutes after smoking. The analysis of variance for repeated measures, followed by Tukey's test or Friedman's test followed by Dunn's test, were applied depending on the normality of data, with p < 0.05. RESULTS: While smoking, there was a decrease in the indices: SD1 (23.4 ± 9.2 vs 13.8 ± 4.8), SD1/SD2 ratio (0.31 ± 0.08 vs 0.2 ± 0.04), RMSSD (32,7 ± 13 vs 19.1 ± 6.8), SDNN (47.6 ± 14.8 vs 35.5 ± 8.4), HFnu (32,5 ± 11.6 vs 19 ± 8.1) and the RR interval (816.8 ± 89 vs 696.5 ± 76.3) in relation to the rest period, whereas increases in the LFnu index (67.5 ± 11.6 vs 81 ± 8.1) and the LF/HF ratio (2.6 ± 1.7 vs 5.4 ± 3.1) were observed. The visual analysis of the plot showed a lower dispersion of RR intervals while smoking. Except for the SD1/SD2 ratio, the other indices presented recovery of values 30 minutes after smoking. CONCLUSION: Smoking resulted in acute modifications of the autonomic control, characterized by sympathetic activation and vagal withdrawal, presenting recovery 30 minutes after smoking.
Authors: Ana Ca de Souza; José R Cisternas; Luiz Carlos de Abreu; Adriano L Roque; Carlos Bm Monteiro; Fernando Adami; Luiz Carlos M Vanderlei; Fernando H Sousa; Lucas L Ferreira; Vitor E Valenti Journal: Int Arch Med Date: 2014-05-15
Authors: Sheila Ap F da Silva; Heraldo L Guida; Ana Marcia Dos Santos Antonio; Luiz Carlos de Abreu; Carlos B M Monteiro; Celso Ferreira; Vivian F Ribeiro; Viviani Barnabe; Sidney B Silva; Fernando L A Fonseca; Fernando Adami; Marcio Petenusso; Rodrigo D Raimundo; Vitor E Valenti Journal: Int Cardiovasc Res J Date: 2014-09-01
Authors: Ana Paula Soares Dos Santos; Dionei Ramos; Gabriela Martins de Oliveira; Ana Alice Soares Dos Santos; Ana Paula Coelho Figueira Freire; Juliana Tiyaki Ito; Renato Peretti Prieto Fernandes; Luiz Carlos Marques Vanderlei; Ercy Mara Cipulo Ramos Journal: Arq Bras Cardiol Date: 2016-05-03 Impact factor: 2.000