Persistent decrease in heart rate after smoking cessation: a 1-year follow-up study

Area of Science:

• Cardiovascular Physiology
• Addiction Medicine
• Nicotine Research

Background:

• Nicotine, a primary component of tobacco, is a well-known stimulant.
• Nicotine consumption acutely increases heart rate and blood pressure.
• The long-term cardiovascular effects of smoking cessation are of significant clinical interest.

Purpose of the Study:

• To investigate the longitudinal changes in heart rate following smoking cessation.
• To determine if the heart rate reduction post-cessation is sustained over one year.
• To explore potential chronic adaptations of heart rate to nicotine.

Main Methods:

• Prospective observational study.
• Heart rate monitoring in 11 smokers during their first year of abstinence.
• Data collection at baseline, 1 day, and at various intervals up to 12 months post-cessation.

Main Results:

• A significant mean heart rate drop of 9.07 bpm was observed one day after smoking cessation (74.18 to 65.11 bpm).
• No significant heart rate variations were detected at subsequent time points up to 12 months.
• Heart rate at 1 year post-cessation (66.36 bpm) remained significantly below baseline.
• A minority of subjects showed a trend toward heart rate recovery, suggesting a possible chronic component.

Conclusions:

• Heart rate decrease after smoking cessation largely represents a permanent return to baseline in the absence of nicotine.
• While primarily acute, a minor chronic adaptation to nicotine may influence heart rate in some individuals.
• Interindividual variability plays a role in the long-term cardiovascular response to smoking cessation.