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We studied the networks of Granger causality (GC) between the time series of cardiac vagal autonomic activity and brain wave activities, measured respectively as the normalized high frequency (HF) component of heart rate variability and EEG power in the δ, θ, α, σ, β bands, computed in 10 healthy subjects during sleep. GC analysis was performed by vector autoregressive modeling, and significance of...
Cardiorespiratory polygraphies do not allow the traditional sleep scoring. Therefore this study evaluated whether fractal dimension (FD) analysis of ECG and respiration (RSP) provides information on sleep stages. We considered two sleep-scored overnight full-polysomnographies. R-R intervals (RRI) from the ECG and RSP were resampled (4 Hz) and normalized to unit variance. FD of a segment of N samples...
Seismocardiogram (SCG) can be detected over the 24h in ambulant subjects by a textile-based wearable system. This study explores the feasibility of a beat-to-beat estimation of cardiac mechanical features from the joint ECG and SCG assessment during sleep. This approach will be used to investigate sleep physiology in microgravity on board the International Space Station.
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