Table 1.

List of common sEMG features with references. K is the number of window segments used for multi-window features.

Feature	Abbr.	Reference	Feature	Abbr.	Reference
Average amplitude change	AAC	[13]	Mean spike amplitude	MSA	[14]
Autoregressive coefficients (second and fourth order)	AR2 AR4	[13,15]	Mean spike duration	MSD	[14]
Approximate entropy	ApEn	[12,16]	Mean spike frequency	MSF	[14]
Coefficients of cepstral analysis (fourth order)	CC4	[13]	Mean spike slope	MSS	[14]
Difference absolute standard deviation value	DASDV	[13]	Multiple trapezoidal windows ($K=3$)	MTW	[12]
Detrended fluctuation analysis	DFA	[17]	Myopulse percentage rate	MYOP	[13]
Frequency ratio	FR	[13]	Peak frequency	PKF	[13]
Higuchi’s fractal dimension	HFD	[17]	Power spectrum ratio	PSR	[13]
Kurtosis	KURT	[12]	Root mean square	RMS	[13]
Log detector	LOG	[13]	Skewness	SKEW	[12]
Mean absolute value	MAV	[18]	Spectral moments	SM1 SM2 SM3	[13]
Mean absolute value slope ($K=3$)	MAVS	[18]	Slope sign change	SSC	[18]
Median frequency	MDF	[13]	Sample entropy	SampleEn	[12,19]
Maximum fractal length	MFL	[17]	Total power	TTP	[13]
Multiple Hamming windows ($K=3$)	MHW	[12]	Variance of EMG	VAR	[13]
Modified mean absolute value 1	MMAV1	[13]	Variance of central frequency	VCF	[13]
Modified mean absolute value 2	MMAV2	[13]	Willison amplitude	WAMP	[13]
Mean frequency	MNF	[13]	Waveform length	WL	[18]
Mean power	MNP	[13]	Zero crossings	ZC	[18]
Mean number of peaks per spike	MNPPS	[14]