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Age and ethnicity differences in short-term heart-rate variability.
Jong-Bae Choi1, Suzi Hong, Richard Nelesen
1Department of Neuropsychiatry, Kyunggi Provincial Hospital for the Elderly, Kyunggi-do, South Korea.
Psychosomatic Medicine
|June 2, 2006
Summary
Young African Americans exhibit premature autonomic nervous system aging, showing heart rate variability (HRV) patterns similar to older Caucasians. This suggests potential early-onset autonomic dysfunction in this demographic.
Area of Science:
- Cardiovascular Physiology
- Autonomic Nervous System Research
- Ethnic Health Disparities
Background:
- Hypertension prevalence and severity increase with age and are higher in African Americans.
- Autonomic nervous system (ANS) activity, assessed via heart rate variability (HRV), may explain these demographic differences.
- HRV analysis offers a non-invasive method to study ANS effects on cardiac function.
Purpose of the Study:
- To investigate the influence of age and ethnicity on heart rate variability (HRV).
- To compare autonomic nervous system (ANS) activity patterns between African Americans and Caucasian Americans across different age groups.
Main Methods:
- Studied 135 participants (57 African Americans, 78 Caucasian Americans), aged 23-54 years.
- Calculated HRV indices, including high frequency (HF) power (parasympathetic activity) and LF/HF ratio (sympathovagal balance), from ECG data using spectral analysis.
Main Results:
- Significant age-related changes in HRV indices (HF, LF power, LF/HF) were observed in Caucasian Americans, but not in African Americans.
- Age, ethnicity, and their interaction significantly impacted HF and LF power, even after adjusting for covariates like gender, BMI, and blood pressure.
Conclusions:
- Young African Americans displayed HRV patterns comparable to older Caucasian Americans.
- These findings suggest potential premature aging of the autonomic nervous system in young African American individuals.