Children's sleep and autonomic function: low sleep quality has an impact on heart rate variability

Area of Science:

• Pediatric cardiology
• Autonomic nervous system function
• Sleep science

Background:

• Short sleep duration and poor sleep quality in children are linked to behavioral and emotional issues.
• Disrupted autonomic nervous function, indicated by heart rate variability (HRV), is a predictor of cardiovascular health.
• HRV serves as a noninvasive measure of autonomic function, crucial for assessing cardiovascular risk.

Purpose of the Study:

• To investigate the influence of sleep duration and quality on heart rate variability (HRV) in children.
• To examine the association between sleep parameters and autonomic nervous system balance (sympathetic/parasympathetic activity).
• To explore the moderating role of stress in the relationship between sleep and HRV.

Main Methods:

• A cross-sectional and longitudinal observational study involving Belgian children aged 5-11 years.
• Sleep quality (efficiency, latency, awakenings) measured via accelerometry; sleep duration self-reported.
• Heart rate variability (HRV) analyzed for high-frequency power (HF) and sympathetic/parasympathetic balance (LF/HF).

Main Results:

• Longer sleep latency predicted lower parasympathetic activity (HF).
• Poor sleep quality indicators (awakenings, latency, low efficiency, short corrected duration) were associated with increased sympathetic dominance (higher LF/HF).
• Parent-reported sleep duration showed no association with HRV; stress acted as an enhancer, not a mediator, in sleep-HRV relationships.

Conclusions:

• Low sleep quality, distinct from sleep duration, is linked to an imbalanced autonomic nervous system pattern in children.
• These findings underscore the importance of prioritizing good sleep quality for maintaining children's cardiovascular health.
• Interventions aimed at improving sleep quality may be beneficial for pediatric autonomic function and long-term cardiovascular well-being.