Heart Rate Variability
| ID | Unit | Available After | Range | Also Needs |
|---|---|---|---|---|
HRV_SDNN | ms | 30 seconds | 1 to 80 | - |
Definition
HRV_SDNN is the DeepAffex Cloud's estimate of the subject's SDNN, which is a
measure of Heart Rate Variability
Background
Heart Rate Variability (HRV) refers to the variability in the timing between
one heartbeat and the next. One way to measure HRV is SDNN, the calculated
standard deviation (in milliseconds) of observed intervals that fall between
normal (NN) heartbeats. A higher SDNN corresponds to more inter-beat
variability. DeepAffex estimates SDNN as HRV_SDNN.
Increased heart rate variability suggests an increase in parasympathetic activity and/or a decrease in sympathetic activity of the autonomic nervous system.
High resting heart rate variability is considered healthy and means that the heart is more flexible to the changing needs of the body.
Interpretation Table
| From (>=) | To (<) | Dial Group | Dial Subgroup | Dial Band Colour |
|---|---|---|---|---|
| 0.0 | 1.1 | 1 | 0 | red |
| 1.1 | 2.2 | 1 | 1 | red |
| 2.2 | 3.2 | 1 | 2 | red |
| 3.2 | 4.3 | 1 | 3 | red |
| 4.3 | 5.4 | 1 | 4 | red |
| 5.4 | 6.5 | 1 | 5 | red |
| 6.5 | 7.6 | 1 | 6 | red |
| 7.6 | 8.6 | 1 | 7 | red |
| 8.6 | 9.7 | 1 | 8 | red |
| 9.7 | 10.8 | 1 | 9 | red |
| 10.8 | 11.4 | 2 | 0 | lightred |
| 11.4 | 11.9 | 2 | 1 | lightred |
| 11.9 | 12.5 | 2 | 2 | lightred |
| 12.5 | 13.0 | 2 | 3 | lightred |
| 13.0 | 13.6 | 2 | 4 | lightred |
| 13.6 | 14.2 | 2 | 5 | lightred |
| 14.2 | 14.7 | 2 | 6 | lightred |
| 14.7 | 15.3 | 2 | 7 | lightred |
| 15.3 | 15.8 | 2 | 8 | lightred |
| 15.8 | 16.4 | 2 | 9 | lightred |
| 16.4 | 18.3 | 3 | 0 | yellow |
| 18.3 | 20.2 | 3 | 1 | yellow |
| 20.2 | 22.1 | 3 | 2 | yellow |
| 22.1 | 24.0 | 3 | 3 | yellow |
| 24.0 | 26.0 | 3 | 4 | yellow |
| 26.0 | 27.9 | 3 | 5 | yellow |
| 27.9 | 29.8 | 3 | 6 | yellow |
| 29.8 | 31.7 | 3 | 7 | yellow |
| 31.7 | 33.6 | 3 | 8 | yellow |
| 33.6 | 35.5 | 3 | 9 | yellow |
| 35.5 | 37.1 | 4 | 0 | lightgreen |
| 37.1 | 38.7 | 4 | 1 | lightgreen |
| 38.7 | 40.3 | 4 | 2 | lightgreen |
| 40.3 | 41.9 | 4 | 3 | lightgreen |
| 41.9 | 43.5 | 4 | 4 | lightgreen |
| 43.5 | 45.1 | 4 | 5 | lightgreen |
| 45.1 | 46.7 | 4 | 6 | lightgreen |
| 46.7 | 48.3 | 4 | 7 | lightgreen |
| 48.3 | 49.9 | 4 | 8 | lightgreen |
| 49.9 | 51.5 | 4 | 9 | lightgreen |
| 51.5 | 54.4 | 5 | 0 | green |
| 54.4 | 57.2 | 5 | 1 | green |
| 57.2 | 60.1 | 5 | 2 | green |
| 60.1 | 62.9 | 5 | 3 | green |
| 62.9 | 65.8 | 5 | 4 | green |
| 65.8 | 68.6 | 5 | 5 | green |
| 68.6 | 71.5 | 5 | 6 | green |
| 71.5 | 74.3 | 5 | 7 | green |
| 74.3 | 77.2 | 5 | 8 | green |
| 77.2 | 80.0 | 5 | 9 | green |
| 80.0 | +∞ | 5 | 10 | green |