Table 4

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
NEstimate (95% CI)NEstimate (95% CI)NEstimate (95% CI)NEstimate (95% CI)NEstimate (95% CI)
20–292317.7 (14.7 to 20.7)2310.5 (7.5 to 13.6)2326.6 (17.1 to 36.0)2311.9 (7.4 to 16.5)23100.4 (84.1 to 116.7)
30–395315.8 (13.6 to 18.0)539.2 (6.8 to 11.5)5321.3 (14.2 to 28.5)539.6 (6.0 to 13.2)5383.4 (71.6 to 95.3)
40–497914.0 (12.5 to 15.5)797.8 (6.1 to 9.4)7916.0 (11.1 to 20.9)797.2 (4.6 to 9.8)7966.5 (58.4 to 74.7)
50–5913812.1 (10.9 to 13.3)1386.4 (5.4 to 7.5)13810.8 (8.0 to 13.5)1384.8 (3.1 to 6.6)13849.6 (43.0 to 56.3)
60–6912510.2 (8.6 to 11.8)1255.0 (4.3 to 5.8)1255.5 (4.2 to 6.8)1252.5 (1.5 to 3.4)12532.7 (24.1 to 41.3)
70–79478.4 (6.1 to 10.7)473.7 (2.6 to 4.7)472.9 (1.2 to 4.5)470.1 (-0.8 to 1.0)4715.8 (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.