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The interplay between heart rate variability, inflammation, and lipid accumulation: Implications for cardiometabolic
Cameron R Wiley1, Vida Pourmand1, Sarah K Stevens1
1Department of Psychological Science, University of California, Irvine, Irvine, California, USA.
Insights
Lower heart rate variability (HRV) is linked to obesity, but the lipid accumulation product (LAP) is a stronger indicator of cardiovascular disease risk than BMI. Inflammation (CRP) mediates this association, highlighting the cholinergic anti-inflammatory pathway.
Area of Science:
- Cardiovascular disease research
- Obesity and metabolic health
- Inflammation and disease pathogenesis
Background:
- Deleterious adiposity, such as obesity, is recognized as an inflammatory condition elevating cardiovascular disease (CVD) risk.
- Lower heart rate variability (HRV) independently predicts CVD risk and is associated with increased adiposity and inflammation.
- Different adiposity indices, like body mass index (BMI) and lipid accumulation product (LAP), vary in their predictive power for disease risk.
Purpose of the Study:
- To investigate the differential associations between HRV and multiple adiposity measures, specifically LAP and BMI.
- To examine the mediating role of inflammation, measured by C-reactive protein (CRP), in the relationship between adiposity and HRV.
- To validate findings using both cross-sectional and prospective longitudinal designs.
Main Methods:
- Employed cross-sectional and prospective study designs.
- Assessed heart rate variability (HRV) as a measure of autonomic function.
- Quantified adiposity using body mass index (BMI) and lipid accumulation product (LAP).
- Measured systemic inflammation via C-reactive protein (CRP) levels.
Main Results:
- Study 1 revealed a stronger inverse association between HRV and LAP compared to other adiposity measures.
- This association between HRV and LAP was significantly mediated by CRP levels, indicating inflammation's role.
- Study 2 replicated these findings and confirmed the persistence of the association over a 4-year follow-up period.
Conclusions:
- Lipid accumulation product (LAP) may serve as a more potent indicator of cardiovascular disease risk than traditional measures like BMI.
- The significant link between HRV and LAP is mediated by inflammation (CRP), underscoring the importance of the cholinergic anti-inflammatory pathway.
- These findings highlight inflammation's central role in connecting obesity metrics like LAP to cardiovascular health indicators like HRV.
Abstract:
Deleterious adiposity (e.g., obesity) is considered an inflammatory condition that increases risk for cardiovascular diseases. Lower heart rate variability (HRV), an independent predictor of cardiovascular disease risk, is linked with higher levels of adiposity and inflammation. However, indices of adiposity vary in their strength of association with disease risk. Body mass index (BMI) is a modest predictor of disease, while the lipid accumulation product (LAP) better predicts disease risk. The current investigation used cross-sectional and prospective designs to probe the differential associations between HRV and multiple measures of adiposity (e.g., LAP and BMI) and examine if inflammation (measured via C-reactive protein; CRP) mediated these associations. Study 1 showed that HRV was more strongly linked with LAP relative to other adiposity measures and that this link was mediated by CRP. Study 2 replicated Study 1 results and showed that this association remained significant 4 years later. Our novel findings are consistent with studies suggesting LAP may be a superior measure of cardiovascular disease risk relative to other measures of adiposity. Importantly, the strong link between HRV and LAP was mediated by inflammation, highlighting the key role of the cholinergic anti-inflammatory pathway in regulating obesity and associated health consequences.
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