Table 3.
Diagnostic parameters of the ROC curve for each parameter.
| Cut-off value | Specificity | Sensitivity | AUC (95%CI) | |
|---|---|---|---|---|
| Experiment 1 maximal force | ||||
| RF | ||||
| EMG | ||||
| RMS | 1.50 | 0.96 | 0.95 | 0.97 (0.93–1.00) |
| MPF | 129.7 | 0.83 | 0.95 | 0.94 (0.85–1.00) |
| MMG | ||||
| RMS | 7.8 | 0.92 | 1.00 | 0.99(0.98–1.00) |
| MPF | 23.30 | 0.79 | 0.95 | 0.92(0.83–1.00) |
| VM | ||||
| EMG | ||||
| RMS | 1.10 | 1.00 | 0.95 | 0.96 (0.89–1.00) |
| MPF | 117.8 | 0.71 | 0.95 | 0.82 (0.68–0.96) |
| MMG | ||||
| RMS | 10.00 | 0.88 | 1.00 | 0.98 (0.95–1.00) |
| MPF | 24.20 | 0.67 | 1.00 | 0.79 (0.64–0.94) |
| VL | ||||
| EMG | ||||
| RMS | 2.00 | 1.00 | 0.90 | 0.98 (0.94–1.00) |
| MPF | 99.50 | 0.88 | 1.00 | 0.98 (0.94–1.00) |
| MMG | ||||
| RMS | 6.10 | 0.96 | 0.95 | 0.98 (0.96–1.00) |
| MPF | 15.20 | 0.88 | 0.95 | 0.92 (0.83–1.00) |
| Experiment 2 constant force | ||||
| RF | ||||
| EMG | ||||
| RMS | 1.07 | 1.00 | 0.85 | 0.96 (0.90–1.00) |
| MPF | 124.1 | 0.96 | 0.85 | 0.93 (0.85–1.00) |
| MMG | ||||
| RMS | 7.53 | 0.96 | 0.95 | 0.99 (0.97–1.00) |
| MPF | 27.67 | 0.83 | 0.95 | 0.93 (0.85–1.00) |
| VM | ||||
| EMG | ||||
| RMS | 0.60 | 0.88 | 0.95 | 0.97 (0.93–1.00) |
| MPF | 114.33 | 0.88 | 0.95 | 0.90 (0.80–1.00) |
| MMG | ||||
| RMS | 10.23 | 1.00 | 0.95 | 1.00 (0.99–1.00) |
| MPF | 27.67 | 0.83 | 0.95 | 0.92 (0.84–1.00) |
| VL | ||||
| EMG | ||||
| RMS | 0.87 | 1.00 | 0.95 | 0.98 (0.94–1.00) |
| MPF | 113.87 | 0.96 | 0.90 | 0.95 (0.89–1.00) |
| MMG | ||||
| RMS | 3.37 | 0.92 | 0.90 | 0.96 (0.92–1.00) |
| MPF | 20.03 | 0.92 | 0.95 | 0.95 (0.87–1.00) |
Data of cut-off value are shown as mV for EMGRMS, µm for MMGRMS, and Hz for EMGMPF and MMGMPF.
ROC receiver operating characteristic, AUC area under the curve, CI confidence interval, RF rectus femoris, VM vastus medialis, VL vastus lateralis, EMG electromyography, MMG mechanomyography, RMS root mean square, MPF mean power frequency.