Heart rate variability for evaluating vigilant attention in partial chronic sleep restriction

Area of Science:

• Physiology
• Sleep Science
• Neuroscience

Background:

• Chronic partial sleep restriction is a prevalent issue impacting cognitive function and well-being.
• Objective physiological markers are needed to accurately assess sleepiness and vigilant attention.

Purpose of the Study:

• To investigate the utility of spectral heart rate variability (HRV) metrics for quantifying sleepiness under conditions of chronic partial sleep restriction.
• To explore the relationships between HRV, subjective sleepiness (Karolinska Sleepiness Scale - KSS), and objective performance (Psychomotor Vigilance Task - PVT).

Main Methods:

• A controlled laboratory study involving 23 healthy young males.
• Participants were divided into a sleep restriction group (4 hours sleep/night for 5 nights) and a control group (8 hours sleep/night).
• Spectral HRV analysis, KSS ratings, and PVT performance were assessed.

Main Results:

• The [0.01, 0.08] Hz HRV frequency band demonstrated the strongest correlation with PVT performance (r=0.60) and KSS ratings (r=0.33) in the sleep restriction group.
• No significant correlations were found in the control group.
• HRV spectral power alone explained 33% of the variance in PVT performance.

Conclusions:

• Spectral HRV is a sensitive indicator of vigilant attention and sleepiness in individuals experiencing chronic partial sleep restriction.
• HRV metrics can serve as a valuable tool for monitoring cognitive function during periods of sustained sleep deprivation.