Published in:
01-08-2013 | Research Article
Autonomic changes in young smokers: acute effects of inspiratory exercise
Authors:
Fernando Rodrigues, Amanda Aparecida Araujo, Cristiano Teixeira Mostarda, Janaina Ferreira, Michelle Cristina de Barros Silva, Ademir Manoel Nascimento, Fabio Santos Lira, Kátia De Angelis, Maria Cláudia Irigoyen, Bruno Rodrigues
Published in:
Clinical Autonomic Research
|
Issue 4/2013
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Abstract
Purpose
One of the most important consequences of smoking is the development of cardiovascular diseases. However, little is known about the early consequences of smoking and the acute effects of a single inspiratory muscle exercise session (IME). We evaluated the acute effects of an IME on cardiac parameters of young smokers.
Methods
Twelve nonsmokers (C) and fifteen smokers [S; 2.08 (1.0–3.2) pack-years] underwent an acute IME. We evaluated blood pressure (BP) and lactate, and we recorded RR interval for posterior analysis of heart rate variability (HRV), before and after IME.
Results
At baseline, systolic BP and HRV parameters in time and frequency domains were changed in S group in comparison with the C. Following IME, S group reduced systolic BP (−8 %), low frequency band (LF) (−21.4 %), LF/high frequency (HF) (−57 %), as well as increased RR variance (+105 %) and HF band.
Conclusions
Our findings indicate that a single session of inspiratory muscle exercise was able to both reduce systolic BP and improve parasympathetic and sympathetic modulations in young smokers. The results of the current study highlight the importance of furthering research on this area to better elucidate the acute and chronic effects of inspiratory muscle training on early cardiovascular and pulmonary changes of cigarette smoking.