Table 4.
The effect of exercise training on heart rate variability.
| Control Group (n = 18) | Exercise Group (n = 18) | P Value | |||||
|---|---|---|---|---|---|---|---|
| Pre | Post | Pre | Post | Time per Group | Time | Group | |
| SDNN | 27.7 (14.6) | 26.2 (15.3) | 23.2 (8.6) | 24.4 (8.6) | .370 | .947 | .381 |
| TP (ms2) | 944.4 (960.2) | 877.1 (987.5) | 648.0 (454.5) | 682.9 (404.6) | .493 | .827 | .285 |
| lnTP | 6.4 (1.0) | 6.3 (0.9) | 6.2 (0.8) | 6.3 (0.9) | .493 | .805 | .646 |
| LF (ms2) | 225.2 (367.1) | 247.4 (382.9) | 186.2 (187.0) | 117.8 (109.6) | .141 | .447 | .330 |
| lnLF | 4.8 (1.1) | 4.8 (1.2) | 4.7 (1.1) | 4.3 (1.0) | .204 | .311 | .387 |
| HF (ms2) | 137.7 (260.6) | 139.1 (258.8) | 78.9 (84.3) | 109.2 (73.7) | .199 | .161 | .462 |
| lnHF | 4.1 (1.2) | 4.2 (1.2) | 3.9 (1.1) | 4.5 (0.8) | .097 | .060 | .937 |
| LFnu (%) | 58.0 (13.3) | 60.5 (11.9) | 62.1 (12.2) | 43.3 (14.7)* | <.001 | .005 | .043 |
| HFnu (%) | 31.6 (11.0) | 33.5 (11.3) | 27.7 (10.5) | 48.6 (13.7)* | .001 | <.001 | .047 |
| LF/HF | 2.35 (1.75) | 1.83 (1.06) | 2.88 (1.84) | 1.06 (0.68)* | .043 | .001 | .707 |
Note: 4 participants (2 for exercise group and 2 for control group) did not complete the post-test evaluation. Missing data had to be accounted for in the analysis through the use of baseline in a last observation carried forward imputation. *Significant difference within group (P < .05). HF = high frequency, LF = low frequency, LF/HF = low frequency/ high frequency, ln = log transformed, nu = normalization, SDNN = standard deviation of all normal to normal intervals, TP = Total power.