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 Heart Rate
Variability.
Background
Heart Rate Variability refers to the variability in the timing between one heartbeat and the next. DeepAffex measures this with SDNN, which is the standard deviation of the interval between normal heartbeats (in milliseconds). A higher SDNN corresponds to more inter-beat variability.
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 |