Table 2.
HRV components at rest, as a function of the age.
| Age (years) | |||
|---|---|---|---|
| N = 71 | 4 | 5 | 6 |
| HR (beats.mn−1) | 45.3 ± 7.4 | 44.1 ± 5.2 | 43.8 ± 7.8 |
| RMSSD (ms) | 54.4 ± 14.5a* | 44.9 ± 15.5 b | 49.1 ± 11.7 b |
| SD2 (ms) | 274.0 ± 88.0 | 222.9 ± 104.0 | 277.0 ± 95.0 |
| LF (ms2) | 499.2 ± 117.1 | 436.1 ± 162.9 | 471.5 ± 101.3 |
| HF (ms2) | 402.2 ± 133.9 | 361.1 ± 153.0 | 392.1 ± 101.1 |
| LF/HF | 1.3 ± 0.3 | 1.3 ± 0.3 | 1.2 ± 0.3 |
| LFnu (%) | 56.0 ± 5.6 | 55.1 ± 5.5 | 54.7 ± 5.3 |
| HFnu (%) | 44.0 ± 5.6 | 44.9 ± 5.5 | 45.3 ± 5.3 |
Data are expressed as the mean ± SD.
*
indicates a significant effect of age (p < 0.05); the mean values followed by different letters on the same line (a, b) differ significantly (p < 0.05).