Skip to main content
. 2021 Jan 27;11:2284. doi: 10.1038/s41598-021-81874-5

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.