Figure 3

Frequency features of FDIVol and FDIpMA. (A) Blockwise mean frequency (MNF). (B) Blockwise median frequency (MDF). (C) Blockwise peak frequency (PKF) corresponding to the frequency of the maximum energy of the power spectrum. (D) Blockwise frequency ratio (FR), calculated as a ratio between low- and high-frequency content of the sEMG signals with a cutoff frequency of 40 Hz. Values are displayed as mean ± 95% confidence interval.