72-Hour Lag Analysis
How sleep deprivation on Day 1 can affect your HRV and blood pressure on Day 3.
72-Hour Lag Analysis
VitalSync's 72-Hour Lag Analysis model (based on Mullington et al., 2009) tracks how sleep deprivation on Day 1 correlates with reduced HRV and elevated blood pressure on Day 3.
The Science
Mullington et al. found that the cardiovascular effects of sleep deprivation are not always immediate — they can manifest 48–72 hours later. This delayed effect is often missed by conventional health tracking.
How VitalSync Detects It
VitalSync looks back 72 hours when generating insights. If you had a poor sleep night (< 6 hours or < 75% efficiency) three days ago, and your HRV or BP is elevated today, VitalSync will flag the potential connection.
Why This Matters
Without a 72-hour lag analysis, you might attribute today's elevated blood pressure to yesterday's stress — when the real cause was poor sleep three days ago. VitalSync helps you see the full picture.
Related Articles
What Is the Correlation Engine?
An overview of VitalSync's evidence-based health correlation analysis system.
Sleep & Blood Pressure Correlation
How VitalSync detects when poor sleep is driving elevated blood pressure.
HRV-Guided Training Readiness
How VitalSync uses your HRV to recommend training or recovery days.
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