Table 1.
Kinematic and kinetic reliability values for the drop jump
| Trials | |||||
|---|---|---|---|---|---|
| Kinematics | Mean (º) ± SD 95% CI (º) ICC (SEMº) ICC 95% CI |
Mean (º) ± SD 95% CI (º) ICC (SEMº) ICC 95% CI |
Mean (º) ± SD 95% CI (º) ICC (SEMº) ICC 95% CI |
Mean (º) ± SD 95% CI (º) ICC (SEMº) ICC 95% CI |
Mean (º) ± SD 95% CI (º) ICC (SEM°) ICC 95% CI |
| Single Trial | 2-Trial Avg | 3-Trial Avg | 4-Trial Avg | 5-Trial Avg | |
| Hip flexion | 55.13 ± 12.06 | 54.66 ± 12.23 | 54.41 ± 11.85 | 54.12 ± 11.80 | 53.76 ± 12.04 |
| 45.38-64.88 | 47.47-61.85 | 49.22-59.60 | 50.11-58.13 | 50.42-57.10 | |
| .83a (4.97) | .91 (3.67) | .95 (2.65) | .97 (2.04) | .98 (1.70) | |
| .55-.94 | .71-.97 | .88-.98 | .93-.99 | .95-.99 | |
| Hip adduction | 13.47 ± 5.19 | 11.74 ± 4.87 | 10.95 ± 5.04 | 10.61 ± 5.20 | 10.43 ± 5.30 |
| 8.38-18.56 | 8.17-15.31 | 8.34-13.56 | 7.91-13.31 | 8.11-12.75 | |
| .75a (2.60) | .86 (1.82) | .93 (1.33) | .93 (1.38) | .95 (1.19) | |
| .39-.91 | .56-.95 | .84-.98 | .85-.98 | .88-.98 | |
| Hip internal rotation | 11.27 ± 9.24 | 12.01 ± 9.66 | 11.37 ± 8.24 | 10.81 ± 7.68 | 10.54 ± 7.59 |
| 0-24.33 | 0.81-23.31 | 2.98-19.76 | 4.25-17.37 | 5.39-15.69 | |
| .48a (6.66) | .65 (5.71) | .73 (4.28) | .81 (3.35) | .88 (2.63) | |
| -.05-.80 | -.10-.89 | .33-.91 | .59-.93 | .73-.95 | |
| Knee flexion | 63.46 ± 10.78 | 60.11 ± 6.82 | 59.60 ± 5.73 | 59.82 ± 6.05 | 60.04 ± 6.43 |
| 43.30-83.62 | 47.86-72.36 | 50.14-69.06 | 52.41-67.23 | 53.74-66.34 | |
| .09a (10.28) | .16 (6.25) | .29 (4.83) | .61 (3.78) | .75 (3.22) | |
| -.44-.58 | -1.61-.73 | -.73-.75 | .12-.86 | .46-.91 | |
| Knee valgus | 10.44 ± 4.42 | 9.83 ± 3.59 | 9.54 ± 3.40 | 9.58 ± 3.46 | 9.60 ± 3.36 |
| 3.40-17.48 | 4.90-14.76 | 6.08-13 | 6.87-12.29 | 7.14-12.06 | |
| .34a (3.59) | .51 (2.51) | .73 (1.77) | .84 (1.38) | .86 (1.26) | |
| -.20-.73 | -.52-.84 | .34-.91 | .63-.94 | .70-.95 | |
| Knee external rotation | 11 ± 7.79 | 10.65 ± 6.71 | 10.76 ± 7.06 | 10.79 ± 7.46 | 10.78 ± 7.52 |
| 3.21-18.79 | 5.56-15.74 | 7.10-14.42 | 7.87-13.71 | 8.23-13.33 | |
| .74a (3.97) | .85 (2.60) | .93 (1.87) | .96 (1.49) | .97 (1.30) | |
| .36-.91 | .53-.95 | .82-.97 | .90-.98 | .94-.99 | |
| Kinetics | |||||
| GRF (BW) | 4.79 ± .89 | 4.66± .81 | 4.64 ± 1.04 | 4.74 ± 1.07 | 4.27 ± 1.00 |
| 3.67-5.91 | 3.86-5.46 | 3.89-5.41 | 4.18-5.30 | 3.75-4.79 | |
| .59a (.57) | .74 (.41) | .86 (.40) | .93 (.28) | .93 (.27) | |
| .08-.85 | .15-.92 | .65-.95 | 84-.98 | .85-.98 | |
| Contact time (seconds) | .043 ± .011 | .038 ± .008 | .038 ± .008 | .039 ± .008 | .040 ± .008 |
| .04-.05 | .03-.05 | .03-.04 | .03-.04 | .04-.04 | |
| .70a (.003) | .82 (.004) | .85 (.003) | .91 (.002) | .94 (.002) | |
| .26-.90a | .42-.95 | .61-.95 | .78-.97 | .86-.98 | |
SD: standard deviation; ICC: Intraclass Correlation Coefficient; SEM: standard error of measurement estimated using SD of the score; 95% CI: confidence interval based on SEM; GRF: ground reaction forces/times body weight.
a
Intraclass correlation coefficients for a single trial (ICC [3, 1]) were calculated based on the number of multiple trials used by the following formula: between subjects mean square - error mean square / between subjects mean square + (k-1) error mean square (Figure 3).14