Table 3.
Results from the linear mixed models for peak head angular velocity with beta coefficients, standard error (SE), p value, lower and upper 95% confidence intervals (CI) of the beta coefficient. A significant group*condition effect was found for peak head velocity, resulting in two final models stratified by condition. A significant main effect of group and a significant group*time interaction was found for peak head velocity during Walk-HT, but not Seated-HT, where athletes with SRC turned their heads slower initially, but gradually increased over time, compared to controls. No significant group*condition effects were found in preliminary models for head angle or gait speed. No significant group*time effect was found for head angle or gait speed.
| Beta | SE | PValue | Lower CI | Upper CI | |
|---|---|---|---|---|---|
| Peak Head Angular Velocity | |||||
|
| |||||
| Seated-HT | |||||
| Intercept | 196.47 | 9.19 | < 0.001 | 178.29 | 214.65 |
| Group | -26.71 | 13.58 | 0.051 | -53.58 | 0.16 |
| Time | 1.25 | 1.13 | 0.269 | -0.98 | 3.48 |
| Group*Time | 3.06 | 1.74 | 0.080 | -0.38 | 6.50 |
| Walk-HT | |||||
| Intercept | 275.44 | 11.12 | <0.001 | 253.22 | 297.67 |
| Group | -49.47 | 16.33 | 0.003 | -81.78 | -17.16 |
| Time | -0.23 | 0.91 | 0.802 | -2.03 | 1.57 |
| Group*Time | 4.80 | 1.41 | <0.001 | 2.01 | 7.60 |
|
| |||||
| Peak Head Angle | |||||
|
| |||||
| Intercept | 62.65 | 1.57 | <0.001 | 59.57 | 65.74 |
| Group | -3.13 | 2.26 | 0.166 | -7.58 | 1.31 |
| Time | -0.33 | 0.19 | 0.076 | -0.70 | 0.03 |
| Walk (ref Seated) | 6.03 | 0.64 | < 0.001 | 4.77 | 7.28 |
| Group*Time | 0.28 | 0.28 | 0.322 | -0.28 | 0.84 |
|
| |||||
| Gait Speed | |||||
|
| |||||
| Intercept | 1.39 | 0.02 | <0.001 | 1.35 | 1.43 |
| Group | -0.01 | 0.03 | 0.644 | -0.07 | 0.04 |
| Time | 0.01 | 0.00 | 0.442 | 0.00 | 0.01 |
| Walk-HT (ref Walk) | -0.06 | 0.01 | < 0.001 | -0.08 | -0.03 |
| Group*Time | 0.01 | 0.00 | 0.099 | -0.00 | 0.01 |