EWGSOP	European Working Group on Sarcopenia in Older People
AWGS	Asian Working Group for Sarcopenia
IWGS	International Working Group on Sarcopenia
FNIH	Foundation of National Institutes of Health
DXA	Dual-energy X-ray Absorptiometry
BIA	Bioelectrical Impedance Analysis
MRI	Magnetic Resonance Imaging
CT	Computed Tomography
SPPB	Short Physical Performance Battery
sEMG	surface Electromyography
AI	Artificial Intelligence
SA	Statistical Analysis
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
ML	Machine Learning
VL	Vastus Lateralis
GL	Gastrocnemius Lateralis
TA	Tibialis Anterior
RF	Rectus Femoris
BF	Biceps Femoris
GM	Gluteus Maximus
HD-sEMG	High-Density sEMG
BRA	Brachioradialis
FCR	Flexor Carpi Radialis
FDS	Flexor Digitorum Superficialis
FCU	Flexor Carpi Ulnaris
ECU	Extensor Carpi Ulnaris
ED	Extensor Digitorum
BB	Biceps Brachii
TB	Triceps Brachii
L5	Multifidus
L1	Iliocostalis Lumborum
MVC	Maximum Voluntary Contraction
SVC	Sustained Voluntary Contraction
EF	Elbow Flexion
EE	Elbow Extension
KF	Knee Flexion
KE	Knee Extension
IED	Inter-electrode Distance
IZ	Innervation Zones
SENIAM	Surface EMG for Non-invasive Assessment of Muscles
EMD	Empirical Mode Decomposition
ICA	Independent Component Analysis
RMS	Root Mean Square
MAV	Mean Absolute Value
iEMG	Integrated EMG
WL	Waveform Length
ZC	Zero Crossing
SSC	Slope Sign Change
CWT	Continuous Wavelet Transform
WE	Wavelet Entropy
IAV	Integrated Absolute Value
MPF	Mean Power Frequency
MF	Median Frequency
AIF	Averaged Instantaneous Frequency
IMFs	Intrinsic Mode Functions
SE	Sample Entropy
mRMR	Minimum Redundancy Maximum Relevance
RQA	Recurrence Quantification Analysis
BW	Bandwidth
SMR	Spectral Moment Ratio
SampEn	Sample Entropy
SpecEn	Spectral Entropy
HFD	Higuchi Fractal Dimension
CSD	Center Shape Distance
LSD	Left Shape Distance
RSD	Right Shape Distance
PCA	Principal Component Analysis
ACR	Amplitude Contribution Ratio
CCR	Co-contraction Ratio
MCI	Muscular Contraction Intensity
MCD	Muscle Contraction Dynamics
SA	Statistical Analysis
SVM	Support Vector Machine
RF	Random Forest
GBM	Gradient Boosting Machine
SHAP	SHapley Additive exPlanations
DT	Decision Tree
LR	Logistic Regression
KNN	K-Nearest Neighbors
NB	Naive Bayes
MLP	Multi-layer Perceptron
XGB	Extreme Gradient Boosting
LDA	Linear Discriminant Analysis
ASM	Appendicular Skeletal Muscle Mass
ICDMC	Incenter-Circumcenter Distance of Muscle Coordination