Complexity analysis of heartbeat dynamics has been widely proven effective for the characterization of cardiac autonomic control in health and disease. Due to methodological limitations, underlying physiological correlates of heartbeat complexity are not well defined yet. In this preliminary study we perform a Sample Entropy (SampEn) analysis on time series of Sympathetic and Parasympathetic Activity Indices (SAI and PAI), which allow a reliable measurement of autonomic peripheral outflow from HRV series. Irregularity of SAI and PAI time series was investigated during postural changes in 10 healthy subjects. Results show a significant SampEn increase after active stand-up with respect to resting state associated with SAI, PAI, and their ratio (SAI/PAI), suggesting that a decrease in heartbeat complexity may be sustained by increased complexity in underpinning sympathetic and vagal dynamics.
Irregularity Analysis of Sympathetic and Parasympathetic Activity Indices from HRV: A Pilot Study on Postural Changes
Citi L.;Barbieri R.;
2020-01-01
Abstract
Complexity analysis of heartbeat dynamics has been widely proven effective for the characterization of cardiac autonomic control in health and disease. Due to methodological limitations, underlying physiological correlates of heartbeat complexity are not well defined yet. In this preliminary study we perform a Sample Entropy (SampEn) analysis on time series of Sympathetic and Parasympathetic Activity Indices (SAI and PAI), which allow a reliable measurement of autonomic peripheral outflow from HRV series. Irregularity of SAI and PAI time series was investigated during postural changes in 10 healthy subjects. Results show a significant SampEn increase after active stand-up with respect to resting state associated with SAI, PAI, and their ratio (SAI/PAI), suggesting that a decrease in heartbeat complexity may be sustained by increased complexity in underpinning sympathetic and vagal dynamics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
