HRV Series

Stream: timeseries | Event type: hrv_series

Heart rate variability (HRV) samples chunked into 15-minute windows. Google Health emits this from the heart-rate-variability sample data type; the daily aggregate (daily-heart-rate-variability) rolls into Daily Summary instead.

Example

{
  "event_type": "hrv_series",
  "data_version": "1.1",
  "source_id": "ts-hrv-a1b2...",
  "provider_ref": "hrv-2026-03-19",
  "device_id": null,
  "payload_ts": 1742558400000,
  "revision": 1,
  "capture_mode": null,
  "window_start": 1742558400000,
  "window_end": 1742559300000,
  "chunk_index": 28,
  "day_complete": false,
  "resolution_s": null,
  "columns": ["ts", "rmssd_ms", "sdnn_ms"],
  "samples": [
    [1742558400000, 55.1, 62.0],
    [1742558460000, 57.4, 64.2]
  ]
}

HRV Columns

Columns are emitted only when the provider supplies that metric, so rmssd_ms and sdnn_ms may be absent independently.

Column	Type	Unit	Description
ts	number	epoch ms	Sample timestamp.
rmssd_ms	number	milliseconds	Root mean square of successive differences.
sdnn_ms	number	milliseconds	Standard deviation of NN intervals.

See Heart Rate Series for the common timeseries chunking fields.