The Association between Central Adiposity and Autonomic Dysfunction in Obesity

Area of Science:

• Cardiology
• Physiology
• Obesity Research

Background:

• Autonomic nervous system (ANS) dysfunction is a growing concern in obesity.
• Central adiposity is increasingly recognized as a risk factor for various health issues.
• Understanding the interplay between obesity, central fat distribution, and ANS function is crucial for preventative strategies.

Purpose of the Study:

• To investigate the association between central adiposity indicators and autonomic nervous system (ANS) dysfunction.
• To identify specific anthropometric and echocardiographic parameters related to ANS dysfunction in obese individuals.
• To evaluate the utility of heart rate recovery (HRR) assessment in different phases for detecting ANS dysfunction.

Main Methods:

• 114 obese individuals without cardiovascular risk factors were studied.
• Measurements included weight, height, waist circumference (WC), BMI, left ventricular mass, and epicardial fat thickness (EFT).
• Autonomic function was assessed via exercise testing, measuring heart rate recovery (HRR), R-R interval variation, and sympathetic skin response; Pearson's correlation and multiple linear regression were used.

Main Results:

• Heart rate recovery (HRR) at 1-5 min showed negative correlations with WC and age.
• Age was the sole independent predictor of reduced HRR, while WC predicted reduced HRR at 3 min.
• No significant associations were found between central obesity parameters (including EFT) and electrophysiological measures of ANS dysfunction.

Conclusions:

• Central adiposity and aging are associated with autonomic nervous system (ANS) dysfunction in obese individuals.
• Waist circumference (WC) may serve as a potential marker for ANS dysfunction in this population.
• Assessing heart rate recovery (HRR) during later decay phases appears more valuable for evaluating ANS function than early recovery phases.