Lead Exposure, Metabolic Syndrome, and Heart Rate Variability
Author Information
Author(s): Park Sung Kyun, Schwartz Joel, Weisskopf Marc, Sparrow David, Vokonas Pantel S., Wright Robert O., Coull Brent, Nie Huiling, Hu Howard
Primary Institution: Department of Environmental Health, Harvard School of Public Health
Hypothesis
Does low-level lead exposure affect heart rate variability and is this effect modified by metabolic syndrome?
Conclusion
Elderly men with metabolic syndrome are more susceptible to autonomic dysfunction associated with chronic lead exposure.
Supporting Evidence
- 32% of subjects were identified as having metabolic syndrome.
- Higher patella lead was associated with lower HFnorm and higher LFnorm and LF/HF among subjects with metabolic syndrome.
- Statistically significant interactions were found between hypertension and patella lead for heart rate variability measures.
Takeaway
This study found that older men with health issues related to metabolism are more affected by lead in their bones, which can hurt their heart's ability to function well.
Methodology
Heart rate variability was measured in 413 elderly men, and associations with bone lead levels were analyzed, considering metabolic syndrome and its components.
Potential Biases
The study may have residual confounding from unmeasured factors affecting heart rate variability.
Limitations
The study's findings may not be generalizable to women or non-white populations, and it could not evaluate blood lead levels at the time of heart rate variability measurement.
Participant Demographics
All participants were male, with a mean age of 72.9 years.
Statistical Information
P-Value
0.048
Confidence Interval
95% CI, −8.2 to 0.5 nu
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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