Fatigue Evaluation through Machine Learning and a Global Fatigue Descriptor

Table 1

List of the various EMG and HRV parameters studied.

EMG			ECG/HRV
Time domain	Frequency domain	Time-frequency domain	Time domain	Frequency domain
RMS	Median frequency	Median frequency	Maximum RR interval	Power inside ULF band
	Total power	Major frequency	Minimum RR interval	Power inside VLF band
		Major time	Average RR interval	Power inside LF band
		Mean power	SDNN	Power inside HF band
		Area	rmsSD	Median frequency
		Volume	Triangular index
		Time dispersion	SD1
		Frequency dispersion	SD2
			SD1/SD2

RMS, root mean square; SD, standard deviation of NN intervals; rmsSD, root mean square of successive differences; Poincaré Standard Deviation/Dispersion of points perpendicular (SD1) or along (SD2) the axis of line-of-identity (ellipse semiaxes 1 and 2). ULF, ultralow frequency band ([0; 0.003] Hz); very low-frequency band ([0.003; 0.040] Hz); low-frequency band ([0.040; 0.150] Hz); high-frequency band ([0.150; 0.400] Hz).