Key result
Metabolic syndrome was significantly associated with decreased long-term and short-term heart rate variability (p < 0.05), particularly in nighttime and 24-h recordings.
Why the study?
Is metabolic syndrome associated with altered short-term and long-term heart rate variability in elderly subjects free of clinical cardiovascular disease?
Cross-Sectional (n=1,011)
Is metabolic syndrome associated with altered short-term and long-term heart rate variability in elderly subjects free of clinical cardiovascular disease?
Answers are grounded in this paper and cite their sources.
Metabolic syndrome is associated with decreased autonomic nervous system function as measured by heart rate variability, particularly long-term HRV, in elderly individuals without clinical cardiovascular disease.
OBJECTIVE: Autonomic nervous system (ANS) activity decrease has been associated with a higher risk of sudden cardiovascular and cerebrovascular disease. Thus, we explored the relationship between ANS control of the cardiovascular system and metabolic syndrome. METHODS: We analyzed the relationship with both short-term and long-term heart rate variability (HRV) and metabolic syndrome in the cross-sectional PROgnostic indicator OF cardiovascular and cerebrovascular events (PROOF) cohort study of 1,011 elderly subjects recruited amongst the inhabitants of the city of Saint Etienne, France, aged 65.6 ± 0.8 years at the inclusion date. Physical examination included measurements of height, weight, systolic and diastolic blood pressure, waist circumference, and biological parameters. HRV variables were measured over 5-min, nighttime, and 24-h periods using Holter monitoring. RESULTS: After adjustment for current type 2 diabetes, depression, and smoking, we found that metabolic syndrome status, high-density lipoprotein cholesterol (HDL-C), and waist circumference were significantly (p < 0.05) associated with total power, very-low frequency, low-frequency/high-frequency (LF/HF) ratio, and normalized LF. HDL-C and metabolic syndrome status were significantly associated with decreased long-term HRV variables. Both nighttime and 24-h HRV showed closer associations with metabolic syndrome than did short-term HRV (5-min). Metabolic syndrome severity was associated with a decrease in both the long-term and short-term HRV variables. CONCLUSIONS: ANS control alteration of the cardiovascular system was more pronounced when evaluated by long-term than short-term HRV recordings, particularly in women.
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ASSOUMOU et al. (2010) conducted a cross-sectional in Metabolic syndrome (n=1,011). Metabolic syndrome vs. Absence of metabolic syndrome was evaluated on Short-term and long-term heart rate variability (HRV) (p=<0.05). Metabolic syndrome was significantly associated with decreased long-term and short-term heart rate variability (p < 0.05), particularly in nighttime and 24-h recordings.
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