Table 4.
Heart rate variability variables in the studied groups
| Variable | Control group (n = 50) | Static group (n = 20) | Dynamic group (n = 30) | P value |
|---|---|---|---|---|
| Systolic blood pressure (mmHg) | 127.34 ± 7.3 | 123.75 ± 13.16 | 120.42 ± 11.78 | 0.01a |
| Diastolic blood pressure (mmHg) | 78.1 ± 8.7 | 79.3 ± 11.1 | 74.59 ± 7.5 | 0.13 |
| Heart rate (beats/minute) | 73.4 ± 7.76 | 61.9 ± 8.38 | 58.86 ± 8.68 | <0.001b |
| SDNN (milliseconds) | 72.22 ± 27.29 | 75.68 ± 44.68 | 74.67 ± 26.58 | 0.89 |
| RMSSD (milliseconds) | 46.88 ± 31.24 | 59.18 ± 37.46 | 65.79 ± 40.51 | 0.06 |
| HRV index | 15.47 ± 3.89 | 15.37 ± 5.08 | 16.38 ± 3.4 | 0.56 |
| ULF (Hz) | 46.43 ± 36.61 | 53.22 ± 37.18 | 49.07 ± 38.3 | 0.78 |
| VLF (Hz) | 234.63 ± 78.7 | 215.5 ± 85.49 | 213.1 ± 84.12 | 0.45 |
| LF (Hz) | 225.3 ± 64.37 | 228.35 ± 73.28 | 224.43 ± 72.54 | 0.1 |
| HF (Hz) | 131.75 ± 53.49 | 122.99 ± 35.18 | 126.06 ± 35.75 | 0.73 |
Notes: Data presented as mean ± standard deviation.
a
Control versus dynamic (P = 0.01);
b
control versus static (P < 0.001) and dynamic (P < 0.001).
Abbreviations: HF, high frequency; HRV, heart rate variability; LF, low frequency; RMSSD, square root of the mean squared difference of successive normal-to-normal intervals; SDNN, standard deviation of the normal-to-normal intervals; ULF, ultra-low frequency; VLF, very low frequency.