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Influence of Smoking Consumption and Nicotine Dependence Degree inCardiac Autonomic Modulation

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ABSTRACT

Background: Smoking consumption alters cardiac autonomic function.

Objective: Assess the influence of the intensity of smoking and the nicotine dependencedegree in cardiac autonomic modulation evaluated through index of heart ratevariability (HRV).

Methods: 83 smokers, of both genders, between 50 and 70 years of age and with normallung function were divided according to the intensity of smoking consumption(moderate and severe) and the nicotine dependency degree (mild, moderate andsevere). The indexes of HRV were analyzed in rest condition, in linearmethods in the time domain (TD), the frequency domain (FD) and through thePoincaré plot. For the comparison of smoking consumption, unpaired ttest or Mann-Whitney was employed. For the analysis between the nicotinedependency degrees, we used the One-way ANOVA test, followed by Tukey's posttest or Kruskal-Wallis followed by Dunn's test. The significance level was p< 0,05.

Results: Differences were only found when compared to the different intensities ofsmoking consumption in the indexes in the FD. LFun (62.89 ± 15.24 vs75.45 ± 10.28), which corresponds to low frequency spectrum componentin normalized units; HFun (37.11 ± 15.24 vs 24.55 ± 10.28),which corresponds to high frequency spectrum component in normalized unitsand in the LF/HF ratio (2.21 ± 1.47 vs 4.07 ± 2.94). However,in the evaluation of nicotine dependency, significant differences were notobserved (p > 0.05).

Conclusion: Only the intensity of smoking consumption had an influence over the cardiacautonomic modulation of the assessed tobacco smokers. Tobacco smokers withsevere intensity of smoking consumption presented a lower autonomicmodulation than those with moderate intensity.

No MeSH data available.


Qualitative analysis of the Poincaré plot in the differentdegrees of nicotine dependency: mild (individual A - SD1: 16.9 andSD2: 47), moderate (individual B - SD1: 17.8 and SD2: 52.9) andsevere (individual C - SD1: 13.4 and SD2: 46.7).
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f3: Qualitative analysis of the Poincaré plot in the differentdegrees of nicotine dependency: mild (individual A - SD1: 16.9 andSD2: 47), moderate (individual B - SD1: 17.8 and SD2: 52.9) andsevere (individual C - SD1: 13.4 and SD2: 46.7).

Mentions: The qualitative analyses of the Poincaré plot is expressed in figures 2 and 3, which show standard examples of the plot in smokers thatpresented SD1 and SD2 index values close to the mean, according to the intensityof smoking consumption and the degree of nicotine dependency, respectively.


Influence of Smoking Consumption and Nicotine Dependence Degree inCardiac Autonomic Modulation
Qualitative analysis of the Poincaré plot in the differentdegrees of nicotine dependency: mild (individual A - SD1: 16.9 andSD2: 47), moderate (individual B - SD1: 17.8 and SD2: 52.9) andsevere (individual C - SD1: 13.4 and SD2: 46.7).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940150&req=5

f3: Qualitative analysis of the Poincaré plot in the differentdegrees of nicotine dependency: mild (individual A - SD1: 16.9 andSD2: 47), moderate (individual B - SD1: 17.8 and SD2: 52.9) andsevere (individual C - SD1: 13.4 and SD2: 46.7).
Mentions: The qualitative analyses of the Poincaré plot is expressed in figures 2 and 3, which show standard examples of the plot in smokers thatpresented SD1 and SD2 index values close to the mean, according to the intensityof smoking consumption and the degree of nicotine dependency, respectively.

View Article: PubMed Central - PubMed

ABSTRACT

Background: Smoking consumption alters cardiac autonomic function.

Objective: Assess the influence of the intensity of smoking and the nicotine dependencedegree in cardiac autonomic modulation evaluated through index of heart ratevariability (HRV).

Methods: 83 smokers, of both genders, between 50 and 70 years of age and with normallung function were divided according to the intensity of smoking consumption(moderate and severe) and the nicotine dependency degree (mild, moderate andsevere). The indexes of HRV were analyzed in rest condition, in linearmethods in the time domain (TD), the frequency domain (FD) and through thePoincaré plot. For the comparison of smoking consumption, unpaired ttest or Mann-Whitney was employed. For the analysis between the nicotinedependency degrees, we used the One-way ANOVA test, followed by Tukey's posttest or Kruskal-Wallis followed by Dunn's test. The significance level was p< 0,05.

Results: Differences were only found when compared to the different intensities ofsmoking consumption in the indexes in the FD. LFun (62.89 ± 15.24 vs75.45 ± 10.28), which corresponds to low frequency spectrum componentin normalized units; HFun (37.11 ± 15.24 vs 24.55 ± 10.28),which corresponds to high frequency spectrum component in normalized unitsand in the LF/HF ratio (2.21 ± 1.47 vs 4.07 ± 2.94). However,in the evaluation of nicotine dependency, significant differences were notobserved (p > 0.05).

Conclusion: Only the intensity of smoking consumption had an influence over the cardiacautonomic modulation of the assessed tobacco smokers. Tobacco smokers withsevere intensity of smoking consumption presented a lower autonomicmodulation than those with moderate intensity.

No MeSH data available.