Table 6.
Analysis of heart rate variability at time and frequency domains on sitting position according to group and moment of evaluation.
| Variables | Moment | Groups | Effect Size (ηp2) | ||
|---|---|---|---|---|---|
| Control | Experimental | ||||
| Time domain | SDNN (ms) | Initial | 38.45 ± 12.70 | 31.04 ± 12.12 | 0.086 |
| Final | 36.90 ± 15.53 | 39.43 ± 17.88 # | 0.003 | ||
| ηp2 | 0.018 | 0.348 | |||
| RMSSD (ms) | Initial | 34.56 ± 11.11 | 29.05 ± 12.75 | 0.058 | |
| Final | 29.04 ± 12.37 | 34.30 ± 13.73 # | 0.032 | ||
| ηp2 | 0.088 | 0.147 | |||
| Frequency domain | LF (ms2) | Initial | 907 ± 872 | 486 ± 569 | 0.136 |
| Final | 875 ± 756 | 795 ± 789 # | 0.012 | ||
| ηp2 | 0.001 | 0.403 | |||
| HF (ms2) | Initial | 562 ± 398 | 434 ± 497 | 0.064 | |
| Final | 460 ± 389 | 541 ± 397 | 0.005 | ||
| ηp2 | 0.047 | 0.120 | |||
| Total (ms2) | Initial | 1555 ± 1069 | 995 ± 1066 | 0.117 | |
| Final | 1407 ± 1101 | 1426 ± 1088 # | 0.000 | ||
| ηp2 | 0.016 | 0.343 | |||
| LF/HF | Initial | 1.86 ± 1.36 | 1.52 ± 1.08 | 0.018 | |
| Final | 2.55 ± 2.22 | 1.60 ± 1.10 | 0.082 | ||
| ηp2 | 0.078 | 0.003 | |||
| Non-Linear | SampEn | Initial | 1.628 ± 0.175 | 1.596 ± 0.200 | 0.092 |
| Final | 1.490 ± 0.225 | 1.556 ± 0.266 | 0.020 | ||
| ηp2 | 0.006 | 0.015 | |||
| DFA Alfa 1 | Initial | 1.059 ± 0.186 | 1.007 ± 0.300 | 0.008 | |
| Final | 1.214 ± 0.232 | 1.083 ± 0.296 | 0.047 | ||
| ηp2 | 0.126 | 0.075 | |||
Note. SDNN, standard deviation of normal–normal beats; RMSSD, root-mean-square of successive RR intervals. LF, low frequency; HF, high frequency; LF/HF, ratio between high and low frequencies; ηp2, partial eta squared. Values expressed as the mean ± standard deviation; # p < 0.05 versus experimental group-initial; two-way RM ANOVA and Bonferroni’s test.