Key result
Sleep links to increased parasympathetic activity and higher sympathetic complexity versus wakefulness in healthy subjects.
Why the study?
Sleep involves notable decreases in heart rate and blood pressure mediated by autonomic adaptations, but differences in cardiac sympathetic and parasympathetic activity between wakefulness and sleep needed investigation using linear and nonlinear approaches.
Does sleep alter cardiac sympathetic and parasympathetic activity compared to wakefulness in healthy subjects?
Population
18 healthy subjects undergoing a full-night sleep recording
Comparison
Wakefulness vs sleep
Design
Observational study
Authors
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Supports autonomic assessment in healthy sleep; hypothesis-generating and should not yet change practice.
Observational (n=18)
Does sleep alter cardiac sympathetic and parasympathetic activity compared to wakefulness in healthy subjects?
Sleep is characterized by increased parasympathetic activity and greater short-scale sympathetic complexity compared to wakefulness, as measured by linear and nonlinear heart rate variability indices.
Matić et al. (2025) conducted an observational in Healthy subjects (n=18). Sleep state vs. Wakefulness was evaluated on Differences in sympathetic activity index (SAI) and parasympathetic activity index (PAI). Sleep was associated with significantly increased parasympathetic activity and higher sympathetic complexity compared to wakefulness in healthy subjects.
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