Minimal increases in high frequency heart rate variability from wakefulness to sleep were associated with worse sleep quality, greater challenges in daily activities, and greater stress reactivity.
Cross-Sectional (n=85)
Autonomic hypervigilance during sleep onset, indicated by lower HF HRV, is associated with poorer sleep quality and heightened stress reactivity in healthy students.
Sleep is a key biological mechanism in promoting wellbeing and resilience to stress. This cross-sectional study examined connections between sleep, autonomic function, wellbeing, and stress reactivity in healthy individuals. Demographic, lifestyle, sleep, and psychological well-being information were collected from 85 healthy university students. These variables were analysed in conjunction with indices of cardiac autonomic activity, including heart rate and high frequency heart rate variability (HF HRV, an indicator of parasympathetic vagal tone) recorded during nocturnal sleep onset and in response to a cognitive stressor. Correlational analyses revealed that unrefreshing and fragmented sleep was strongly associated with lower HF HRV at sleep onset, suggestive of poorer autonomic de-arousal. Further, those with minimal increases in HF HRV from wakefulness to sleep reported worse sleep quality and greater challenges in daily activities compared to those with significant increases. This same group also demonstrated significantly greater reactivity and slower recovery when faced with a stressor the next day, as evidenced by comparison of heart rate values. Our findings suggest an association between autonomic hypervigilance and aspects of sleep quality, with potential implications for wellbeing and stress responses.
Joubert et al. (Sat,) conducted a cross-sectional in Healthy university students (n=85). Sleep and autonomic function assessment was evaluated on Connections between sleep, autonomic function, wellbeing, and stress reactivity. Minimal increases in high frequency heart rate variability from wakefulness to sleep were associated with worse sleep quality, greater challenges in daily activities, and greater stress reactivity.