Table 2.
Summary of HRV indices in frequency domain of control group and imagery group with the two techniques.
| Indices | Training techniques | Control group | Imagery group | P value of training technique | P value of imagery training | P value of interaction effect |
|---|---|---|---|---|---|---|
| VLF | IGI | 473.1 ± 102.8 | 876.1 ± 171.8 | 0.279 | 0.011 | 0.676 |
| SGI | 594.3 ± 150.8 | 1147.7 ± 266.8 | ||||
|
| ||||||
| LF | IGI | 491.0 ± 41.6 | 707.9 ± 118.4 | 0.540 | 0.044 | 0.715 |
| SGI | 522.6 ± 92.5 | 832.6 ± 209.9 | ||||
|
| ||||||
| HF | IGI | 243.5 ± 26.9 | 421.9 ± 109.1 | 0.603 | 0.005 | 0.241 |
| SGI | 176.9 ± 26.3 | 593.3 ± 174.5 | ||||
|
| ||||||
| LF/HF | IGI | 2.18 ± 0.26 | 2.00 ± 0.26 | 0.085 | 0.473 | 0.787 |
| SGI | 3.00 ± 0.33 | 2.60 ± 0.65 | ||||
|
| ||||||
| TP | IGI | 1207.4 ± 112.9 | 2005.9 ± 304.0 | 0.334 | 0.004 | 0.477 |
| SGI | 1294.1 ± 190.6 | 2573.8 ± 585.4 | ||||
|
| ||||||
| LFNU | IGI | 67.09 ± 2.10 | 65.40 ± 2.56 | 0.505 | 0.126 | 0.295 |
| SGI | 72.91 ± 3.10 | 64.10 ± 5.11 | ||||
|
| ||||||
| HFNU | IGI | 32.91 ± 2.10 | 34.60 ± 2.56 | 0.505 | 0.126 | 0.295 |
| SGI | 27.09 ± 3.10 | 35.90 ± 5.11 | ||||
Note: (1) standard errors are shown in parentheses;
(2) IGI was short for instructor-guided imagery, and SGI was short for self-guided imagery.