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HRV
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Heart Rate Variability (HRV) measures the subtle variation in time between heartbeats.

Photo by hrvatlas

Statistics about HRV

4-7%
HRV Daily Variation
1-3
Days before illness signals
20-40
Typical resting HRV
10-30%
Drop after poor sleep

HRV is not just about heart rate

HRV tracks timing between beats, not beats per minute. It reflects nervous system balance, stress, and recovery. Higher HRV signals better adaptability and resilience.

Nervous System Signal

It reflects the balance between sympathetic and parasympathetic activity.

Higher ≠ Faster

High HRV doesn’t mean a fast heart, just a responsive one.

Recovery Marker

Athletes use HRV to gauge readiness and avoid overtraining.

Stress Sensitive

Mental stress can lower HRV even without physical exertion.

Sleep Dependent

Poor sleep often shows up as reduced HRV the next day.

Highly Individual

HRV baselines vary widely between people—trends matter more than comparisons.

Age-Related Decline

Average HRV gradually decreases with age.

Training Adaptation

Consistent aerobic training can increase baseline HRV over time.

Illness Indicator

Sudden HRV drops can precede sickness or inflammation.

HRV and Biometrics

Apps and smart watches can track HRV.

  • 1

    Breath-Linked HRV

    Slow, controlled breathing can temporarily raise HRV.

  • 2

    Alcohol Effect

    Even small amounts of alcohol often suppress HRV during sleep.

  • 3

    Long-Term Trend Tool

    HRV is most powerful when tracked over weeks or months.

Photo of mobile phone showing HRV data