Table 4. Heart rate variability parameters in the two groups.
Data are presented as mean ± SD. SDNN: standard deviation of the normal-to-normal interval, RMSSD: the square root of the mean of squares of the differences between adjacent NN intervals, pNN50: the proportion derived by dividing NN50 by the total number of NN intervals, LF: low-frequency power (ms2), HF: high-frequency power (ms2). P<0.05* was considered statistically significant. The intragroup comparison was done using the Wilcoxon Signed-Rank test and intergroup comparison was done using the Mann-Whitney U test.
| S.No. | Parameters | Control group (n=25) | p-value | RB group (n=25) | p-value | Intergroup p-value | ||
| Pre | Post | Pre | Post | |||||
| 1. | SDNN (ms) | 63.44±47.24 | 61.42±18.74 | 0.40 | 66.69±33.03 | 78.76±24.15 | 0.001* | 0.001* |
| 2. | RMSSD (ms) | 74.97±57.09 | 72.30±28.06 | 0.45 | 56.66±27.46 | 74.45±22.99 | 0.96 | 0.66 |
| 3. | pNN50 (ms) | 31.49±31.49 | 48.66±18.79 | 0.99 | 30.39±30.39 | 54.82±14.49 | 0.02* | 0.05* |
| 4. | LF (ms2) | 1141.10±1509 | 1127.76±1315 | 0.34 | 1587.6±2308 | 2546.16±2119 | 0.04* | 0.003* |
| 5. | HF (ms2) | 1895.37±1765 | 1543.246±1367 | 0.44 | 2715.1±2466 | 3067.62±2502 | 0.51 | 0.06 |
| 6. | LF/HF | 0.61±0.4311 | 0.65±0.2370 | 0.856 | 2.05±1.889 | 0.25±0.1323 | 0.02* | 0.006* |
| 7. | Total power | 3751.52±2347 | 4009.6±2056 | 0.73 | 3570.23±2829 | 5543.38±2838 | 0.002* | 0.05* |