Table 4. Intra-tester reliability results for the strength measurements, with the left side of the table representing the results when the absolute maximum was used and the right side of the table representing the results when an average of three trials was used.
F-values are printed in bold in case of a systematic error.
| Absolute maximal value | Averaged value | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Intra-tester | F-ratio |
ICC2,1 | CI 95% lower |
upper | Tester 1 average |
Tester 2 average |
% SEM | % MDD | F-ratio | ICC2,1 | CI 95% lower |
upper | Tester 1 average |
Tester 2 average |
% SEM | % MDD | |
| Force (N) | |||||||||||||||||
| Knee extension | 0.060 | 0.847 | 0.494 | 0.960 | 237.870 | 235.008 | 11.050 | 30.628 | 0.001 | 0.822 | 0.423 | 0.953 | 223.062 | 223.483 | 11.480 | 31.822 | |
| Knee flexion | 8.242 | 0.895 | 0.418 | 0.976 | 139.827 | 157.065 | 9.045 | 25.071 | 5.942 | 0.911 | 0.572 | 0.979 | 129.907 | 144.419 | 9.705 | 26.901 | |
| Dorsiflexion | 1.447 | 0.429 | -0.181 | 0.815 | 136.479 | 124.945 | 16.401 | 45.461 | 1.529 | 0.466 | -0.134 | 0.830 | 128.949 | 117.758 | 16.406 | 45.475 | |
| Plantar flexion | 1.098 | 0.690 | 0.182 | 0.911 | 276.963 | 306.767 | 21.786 | 60.387 | 2.722 | 0.715 | 0.234 | 0.919 | 230.362 | 265.125 | 19.018 | 52.715 | |
| Normalized force (N/kg) | |||||||||||||||||
| Knee extension | 0.017 | 0.768 | 0.290 | 0.938 | 7.677 | 7.625 | 11.536 | 31.975 | 0.034 | 0.746 | 0.241 | 0.931 | 7.206 | 7.278 | 12.069 | 33.453 | |
| Knee flexion | 8.932 | 0.764 | 0.117 | 0.942 | 4.428 | 4.990 | 8.935 | 24.766 | 7.540 | 0.837 | 0.294 | 0.961 | 4.108 | 4.572 | 8.714 | 24.153 | |
| Dorsiflexion | 1.849 | 0.139 | -0.427 | 0.669 | 4.453 | 4.033 | 16.243 | 45.024 | 2.005 | 0.223 | -0.350 | 0.713 | 4.208 | 3.799 | 16.169 | 44.817 | |
| Plantar flexion | 1.030 | 0.620 | 0.059 | 0.888 | 8.928 | 9.797 | 20.442 | 56.662 | 2.537 | 0.669 | 0.160 | 0.904 | 7.461 | 8.493 | 18.171 | 50.367 | |
| Torque (Nm) | |||||||||||||||||
| Knee extension | 0.104 | 0.903 | 0.660 | 0.975 | 56.471 | 55.598 | 10.820 | 29.992 | 0.003 | 0.887 | 0.606 | 0.971 | 52.889 | 52.747 | 11.189 | 31.013 | |
| Knee flexion | 7.710 | 0.934 | 0.593 | 0.985 | 33.646 | 37.639 | 9.023 | 25.011 | 5.330 | 0.939 | 0.702 | 0.986 | 31.288 | 34.706 | 10.034 | 27.814 | |
| Dorsiflexion | 1.463 | 0.681 | 0.175 | 0.908 | 11.499 | 10.539 | 16.108 | 44.648 | 1.531 | 0.693 | 0.198 | 0.912 | 10.874 | 9.938 | 16.243 | 45.024 | |
| Plantar flexion | 0.973 | 0.763 | 0.325 | 0.934 | 23.634 | 26.023 | 21.817 | 60.473 | 2.546 | 0.779 | 0.356 | 0.939 | 19.598 | 22.430 | 18.891 | 52.364 | |
| Normalized torque (Nm/kg) | |||||||||||||||||
| Knee extension | 0.045 | 0.806 | 0.385 | 0.948 | 1.802 | 1.782 | 11.300 | 31.321 | 0.008 | 0.775 | 0.305 | 0.940 | 1.689 | 1.697 | 11.812 | 32.740 | |
| Knee flexion | 8.706 | 0.872 | 0.332 | 0.971 | 1.053 | 1.182 | 8.948 | 24.804 | 6.722 | 0.900 | 0.503 | 0.977 | 0.978 | 1.086 | 9.194 | 25.486 | |
| Dorsiflexion | 1.896 | 0.399 | -0.193 | 0.800 | 0.372 | 0.337 | 15.456 | 42.841 | 2.006 | 0.450 | -0.134 | 0.821 | 0.352 | 0.318 | 16.369 | 45.374 | |
| Plantar flexion | 0.918 | 0.695 | 0.187 | 0.913 | 0.755 | 0.824 | 20.425 | 56.616 | 2.414 | 0.725 | 0.255 | 0.922 | 0.629 | 0.713 | 17.639 | 48.892 | |
Abbreviations in alphabetic order: CI = confidence interval; ICC = intra-class correlation coefficient; % MDD = minimal detectable difference as a percentage of the overall mean; N = Newton; N/kg: Newtons per kilogram bodyweight; Nm = newton meter; Nm/kg = newton meter per kilogram bodyweight; % SEM = standard error of measurement as a percentage of the overall mean.