Key result
COPD was associated with significant increases in recurrence plot indices and reductions in linear HRV indices compared with healthy controls, indicating decreased autonomic complexity.
Why the study?
Do individuals with COPD have altered autonomic nervous system function compared to healthy controls?
Case-Control (n=74)
Do individuals with COPD have altered autonomic nervous system function compared to healthy controls?
Individuals with COPD exhibit reduced sympathetic and parasympathetic activity along with decreased complexity of autonomic nervous system function compared to healthy controls.
Answers are grounded in this paper and cite their sources.
Reduced autonomic complexity in COPD via RPs; leaves open whether these indices improve risk stratification beyond linear HRV.
OBJECTIVE: To evaluate autonomic modulation in individuals with COPD, compared with healthy controls, via recurrence plots (RPs) and linear heart rate variability (HRV) indices. METHODS: We analyzed data on 74 volunteers, who were divided into two groups: COPD (n = 43) and control (n = 31). For calculation of HRV indices, heart rate was measured beat-by-beat during 30 min of supine rest using a heart-rate meter. We analyzed linear indices in the time and frequency domains, as well as indices derived from the RPs. RESULTS: In comparison with the control group, the COPD group showed significant increases in the indices derived from the RPs, as well as significant reductions in the linear indices in the time and frequency domains. No significant differences were observed in the linear indices in the frequency domains expressed in normalized units or in the low frequency/high frequency ratio. CONCLUSIONS: Individuals with COPD show a reduction in both sympathetic and parasympathetic activity, associated with decreased complexity of autonomic nervous system function, as identified by RPs, which provide important complementary information in the detection of autonomic changes in this population.
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Vanzella et al. (2018) conducted a case-control in COPD (n=74). COPD vs. Healthy controls was evaluated on Autonomic modulation via recurrence plots and linear heart rate variability indices. COPD was associated with significant increases in recurrence plot indices and reductions in linear HRV indices compared with healthy controls, indicating decreased autonomic complexity.
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