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Time Domain HRV Parameters |
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| Time-domain indices |
Description |
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| Mean RR interval |
The average NN interval per hour; a single 24 hour average will be reported. |
| SDNN |
Standard deviation of the NN interval every hour; a single 24-hour average will be reported. |
| SDNNi |
Standard deviation of the NN interval in every 5 minutes; a single 24-hour average will be reported. |
| RMSSD |
The root mean square of successive differences of adjacent NN intervals; a single 24-hour average will be reported. |
| sNN50 |
Number of pairs of adjacent NN intervals differing by >50 ms; a single 24-hour value for the increases, decreases and total will be reported. |
| Triangular Index |
Total number of all NN intervals divided by the height of the histogram of all NN intervals measured on a discrete scale with bins of 1/128s; a single 24-hour average will be reported. |
| sNN6% |
Number of pairs of adjacent NN intervals differing by >6%; a single 24-hour value for the increases, decreases and total will be reported. |
| VPC > 10%/hour |
The number of hourly segments with > 10% SVE and VPCs will be reported and the absolute number of SVE and VPCs will also be reported. |
Pater et al. Current Controlled Trials in Cardiovascular Medicine 2003 4:2 doi:10.1186/1468-6708-4-2 |
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