TABLE 1.
Differences in Knee Flexion Variables Before and After Fatiguea
| Knee Flexionb | Fatigue Group (n = 17) | Control Group (n = 17) | P | ||
|---|---|---|---|---|---|
| First Series | Ratio, %c | First Series | Ratio, %c | ||
| Second Series | Second Series | ||||
| Angle (all subjects), deg | 60.5 ± 8.6 | 99.5 ± 5.6 | 60.7 ± 10.8 | 101.5 ± 5.9 | .31 |
| 60.1 ± 8.4 | 61.3 ± 9.8 | ||||
| Large knee flexion | 70.8 ± 4.7 | 98.4 ± 8.0 | 69.7 ± 6.1 | 99.4 ± 3.6 | .78 |
| 69.5 ± 3.8 | 69.2 ± 6.2 | ||||
| Small knee flexion | 56.2 ± 5.5 | 99.9 ± 4.7 | 52.8 ± 7.1 | 103.4 ± 6.8 | .18 |
| 56.2 ± 6.5 | 54.3 ± 6.5 | ||||
| Angular velocity (all subjects), deg/s | 419.0 ± 55.2 | 106.1 ± 8.0 | 451.8 ± 55.6 | 100.7 ± 6.6 | .04d |
| 442.4 ± 53.1 | 453.2 ± 49.4 | ||||
| Large knee flexion | 443.7 ± 43.0 | 107.2 ± 10.8 | 458.6 ± 42.8 | 98.3 ± 6.7 | .09 |
| 475.0 ± 65.1 | 450.9 ± 54.0 | ||||
| Small knee flexion | 408.7 ± 58.0 | 105.6 ± 7.1 | 445.8 ± 67.1 | 102.8 ± 6.0 | .35 |
| 428.9 ± 43.2 | 455.2 ± 48.1 | ||||
| Angular acceleration, deg/s2 | |||||
| Maximum value (all subjects) | 3712.7 ± 975.0 | 125.4 ± 40.7 | 3804.7 ± 2198.9 | 92.1 ± 67.1 | .09 |
| 4524.7 ± 1578.2 | 4334.8 ± 2082.8 | ||||
| Large knee flexion | 3922.2 ± 327.9 | 114.5 ± 65.5 | 4375.7 ± 1822.6 | 98.9 ± 36.0 | .59 |
| 4538.7 ± 2589.2 | 4663.1 ± 2783.8 | ||||
| Small knee flexion | 3625.5 ± 1146.9 | 130.0 ± 27.9 | 3297.1 ± 2479.4 | 86.0 ± 88.2 | .12 |
| 4518.9 ± 1088.4 | 4043.0 ± 1300.6 | ||||
| Minimum value (all subjects) | –5664.8 ± 1455.9 | 113.2 ± 21.9 | –6514.7 ± 858.6 | 107.0 ± 15.9 | .35 |
| –6265.7 ± 1544.4 | –6964.1 ± 1408.4 | ||||
| Large knee flexion | –4638.4 ± 1472.5 | 123.8 ± 34.5 | –6272.4 ± 895.6 | 105.4 ± 19.7 | .24 |
| –5483.5 ± 1591.6 | –6622.1 ± 1714.3 | ||||
| Small knee flexion | –6082.4 ± 1271.3 | 108.8 ± 13.9 | –6730.2 ± 813.4 | 108.3 ± 12.8 | .94 |
| –6591.6 ± 1467.7 | –7268.0 ± 1083.8 | ||||
aData are reported as mean ± SD.
bAll kinematic variables were categorized into a large knee flexion subgroup (subjects with mean knee flexion angle above the mean) and a small knee flexion subgroup (subjects with mean knee flexion angle below the mean). The fatigue group had 5 female patients with large knee flexion and 12 with small knee flexion, and the control group had 8 female patients with large knee flexion and 9 with small knee flexion.
cThe ratio of the first series to the second series for each kinematic variable.
dStatistically significant (P < .05).