Age-specific reference data for HRV
| Age (years) | SDNN (ms) n=465 | RMSSD (ms) n=465 | LF (ms2) n=465 | HF (ms2) n=465 | Total power (ms2) n=465 | |||||
| N | Estimate (95% CI) | N | Estimate (95% CI) | N | Estimate (95% CI) | N | Estimate (95% CI) | N | Estimate (95% CI) | |
| 20–29 | 23 | 17.7 (14.7 to 20.7) | 23 | 10.5 (7.5 to 13.6) | 23 | 26.6 (17.1 to 36.0) | 23 | 11.9 (7.4 to 16.5) | 23 | 100.4 (84.1 to 116.7) |
| 30–39 | 53 | 15.8 (13.6 to 18.0) | 53 | 9.2 (6.8 to 11.5) | 53 | 21.3 (14.2 to 28.5) | 53 | 9.6 (6.0 to 13.2) | 53 | 83.4 (71.6 to 95.3) |
| 40–49 | 79 | 14.0 (12.5 to 15.5) | 79 | 7.8 (6.1 to 9.4) | 79 | 16.0 (11.1 to 20.9) | 79 | 7.2 (4.6 to 9.8) | 79 | 66.5 (58.4 to 74.7) |
| 50–59 | 138 | 12.1 (10.9 to 13.3) | 138 | 6.4 (5.4 to 7.5) | 138 | 10.8 (8.0 to 13.5) | 138 | 4.8 (3.1 to 6.6) | 138 | 49.6 (43.0 to 56.3) |
| 60–69 | 125 | 10.2 (8.6 to 11.8) | 125 | 5.0 (4.3 to 5.8) | 125 | 5.5 (4.2 to 6.8) | 125 | 2.5 (1.5 to 3.4) | 125 | 32.7 (24.1 to 41.3) |
| 70–79 | 47 | 8.4 (6.1 to 10.7) | 47 | 3.7 (2.6 to 4.7) | 47 | 2.9 (1.2 to 4.5) | 47 | 0.1 (-0.8 to 1.0) | 47 | 15.8 (3.3 to 28.2) |
The results are estimated from the median age of the specific age spans and presented with 95% CI.
HF power, high-frequency power; HRV, heart rate variability; LF power, low-frequency power; RMSSD, root mean square of the sum of the squares of differences between consecutive R–R intervals; SDNN, SD of normal-to-normal intervals.