Table 2. Peak correlation coefficient (C-peak) and corresponding time lag between flexor and extensor muscle activities in the ankle and knee joints and trunk from 50 ms to 200 ms after the initiation of perturbation.
| BL | BS | FL | FS | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Athlete | Control | Athlete | Control | Athlete | Control | Athlete | Control | ||
| Ankle (TA & GM) | |||||||||
| C-peak | 0.87 ± 0.02 | 0.87 ± 0.03 | 0.86 ± 0.04 | 0.83 ± 0.03 | 0.90 ± 0.04 | 0.86 ± 0.06 | 0.89 ± 0.03 | 0.83 ± 0.06 | * |
| time lag (ms) | 33.7 ± 18.3 | 34.2 ± 12.1 | 11.2 ± 8.5 | 25.0 ± 12.0 | 5.7 ± 2.9 | 17.0 ± 14.0 | 7.3 ± 9.0 | 17.9 ± 16.2 | * |
| Knee (RF & BF) | |||||||||
| C-peak | 0.80 ± 0.03 | 0.84 ± 0.03 | 0.83 ± 0.05 | 0.85 ± 0.04 | 0.84 ± 0.04 | 0.86 ± 0.03 | 0.87 ± 0.03 | 0.87 ± 0.03 | |
| time lag (ms) | 26.1 ± 9.4 | 23.9 ± 10.4 | 16.4 ± 12.8 | 12.5 ± 7.2 | 22.4 ± 11.3 | 14.1 ± 9.0 | 14.4 ± 9.8 | 11.3 ± 8.3 | |
| Trunk (RA & ES) | |||||||||
| C-peak | 0.83 ± 0.03 | 0.84 ± 0.03 | 0.84 ± 0.04 | 0.83 ± 0.05 | 0.80 ± 0.04 | 0.83 ± 0.04 | 0.82 ± 0.03 | 0.82 ± 0.04 | |
| time lag (ms) | 40.3 ± 14.7 | 35.6 ± 14.6 | 30.5 ± 17.0 | 21.1 ± 16.3 | 33.3 ± 14.5 | 19.7 ± 7.6 | 30.7 ± 21.2 | 19.3 ± 12.3 | * |
Values represent mean ± SD. TA, tibialis anterior; GM, medial head of the gastrocnemius; RF, rectus femoris; BF, biceps femoris; RA, rectus abdominis; ES, erector spinae. Abbreviations are the same as for Fig. 1. * p < 0.05.