Heart Rate Variability

IDUnitAvailable AfterRangeAlso Needs
HRV_SDNNms30 seconds1 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 GroupDial SubgroupDial Band Colour
0.01.110
red
1.12.211
red
2.23.212
red
3.24.313
red
4.35.414
red
5.46.515
red
6.57.616
red
7.68.617
red
8.69.718
red
9.710.819
red
10.811.420
lightred
11.411.921
lightred
11.912.522
lightred
12.513.023
lightred
13.013.624
lightred
13.614.225
lightred
14.214.726
lightred
14.715.327
lightred
15.315.828
lightred
15.816.429
lightred
16.418.330
yellow
18.320.231
yellow
20.222.132
yellow
22.124.033
yellow
24.026.034
yellow
26.027.935
yellow
27.929.836
yellow
29.831.737
yellow
31.733.638
yellow
33.635.539
yellow
35.537.140
lightgreen
37.138.741
lightgreen
38.740.342
lightgreen
40.341.943
lightgreen
41.943.544
lightgreen
43.545.145
lightgreen
45.146.746
lightgreen
46.748.347
lightgreen
48.349.948
lightgreen
49.951.549
lightgreen
51.554.450
green
54.457.251
green
57.260.152
green
60.162.953
green
62.965.854
green
65.868.655
green
68.671.556
green
71.574.357
green
74.377.258
green
77.280.059
green
80.0+∞510
green