How to Export HRV Data from Apple Watch

In short

To export HRV data from Apple Watch, download HealthSave free, grant Apple Health access, and export from the Export tab as CSV, JSON, or PDF. Heart Rate Variability measures the variation between heartbeats in milliseconds (SDNN); higher HRV generally signals better fitness and recovery. Apple Watch records it during sleep and rest, and HealthSave can chart 7/30/90-day trends with Pro.

Updated March 23, 2026

In this article

What is HRV Data?

Heart Rate Variability (HRV) measures the variation in time between heartbeats in milliseconds (SDNN). Higher HRV generally indicates better cardiovascular fitness and recovery. Apple Watch measures HRV during sleep and rest periods.

How to Export HRV Data with HealthSave

1. Download HealthSave

Get HealthSave from the App Store, it's free. No account or sign-up needed.

2. Grant Apple Health Access

When you open HealthSave, grant access to the relevant health metrics in Apple Health. Make sure HRV Data is enabled.

3. View on Dashboard

Your latest data appears on the HealthSave dashboard. With Pro, you can track 7/30/90-day trends.

4. Export to CSV, JSON, or PDF

Go to the Export tab, select HRV Data, choose your date range and format:

  • CSV, opens in Excel, Google Sheets, Apple Numbers
  • JSON, structured data for developers and APIs
  • PDF, formatted report to share with your doctor (Pro)

Why Export This Data?

Athletes use HRV trends to optimize training load. Biohackers track HRV to measure the impact of lifestyle changes. Researchers analyze HRV patterns for stress and autonomic nervous system studies.

Related Metrics You Can Export

HealthSave can also export heart rate, resting heart rate, respiratory rate and other core Apple Health metrics. See the full feature list or check supported devices.

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