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Table 3 Repeatability for each EMG parameter

From: A novel approach to surface electromyography: an exploratory study of electrode-pair selection based on signal characteristics

Parameter Repeatability-4* Repeatability-5
of 56 cases % of 56 cases %
Root mean square (RMS) 46 82.14 40 71.43
Mean absolute value (MAV) 44 78.57 40 71.43
Maximum amplitude (MAX) 39 69.64 29 51.79
Slope sign changes (SSC) 31 55.36 21 37.50
Zero crossings (ZC) 29 51.79 18 32.14
Waveform length (WL) 45 80.36 38 67.86
Mean Frequency (MNF) 42 75.00 24 42.86
Median Frequency (MDF) 42 75.00 21 37.5
Signal-to-motion artifact ratio (SMR) 4 7.14 1 1.79
Maximum-to-minimum drop in power density ratio (DPR) 26 46.43 17 30.36
Signal-to-noise ratio (SNR) 36 64.29 21 37.50
Power spectrum deformation (Ω) 30 53.57 20 35.71
  1. * number of cases where the top ranked (i.e., ranked 1) electrode pair was the same for at least 4/5 trials
  2. number of cases where the top ranked electrode pair was the same for all 5 trials.