Table 3. Difference of average SDNN (ms) of horses between the experienced rider (regular reins) and beginner rider (regular reins & buffer reins)
| Rider | Reins | Walk | Rising trot | Sitting trot |
| SDNN (ms) | Experienced rider (E) | Regular (a) | 30.35 ± 6.08 (100.00%) | 19.26 ± 8.13 (63.46%) | 17.11 ± 5.70 (56.38%) |
| Beginner rider (B) | Regular (a) | 32.22 ± 6.28 (106.16%) | 13.45 ± 2.59 (41.74%) | 14.48 ± 5.81 (47.71%) |
| Beginner rider (B) | Buffer (b) | 31.94 ± 11.61 (105.24%) | 21.40 ± 2.551) (70.51%) | 16.88 ± 5.67 (55.62%) |
Significantly different (p < 0.05) from rising trot of beginner rider equipped regular reins.