ANN	Artificial Neural Networks
ANOVA	Analysis of Variance
ANS	Autonomic Nervous System
API	Application Programming Interface
BIS	Bioimpedance Spectrometry
BN	Bayesian Networks
BPAQ	Baecke Physical Activity Questionnaire
BSN	Body Sensor Networks
CNN	Convolutional Neural Network
DBN	Deep Belief Networks
DCT	Discrete Cosine Transform
DL	Deep Learning
DT	Decision Tree
ECG	Electrocardiagram
EEG	Electroencephalogram
ELISA	Enzyme-Linked Immunosorbent Assay
EMG	Electromyogram
EMI	Electromagnetic Interference
FACS	Facial Action Coding System
FFT	Fast Fourier Transform
fMRI	Functional Magnetic Resonance Imaging
fNIRS	Functional Near-Infrared Spectroscopy
gLASSO	Sparse Graphical Model
GP	Gaussian Process
HbO	Oxygenated Hemoglobin
HbR	Deoxygenated Hemoglobin
HF	High-Frequency
HOG	Histogram of Oriented Gradients
HRV	Heart Rate Variability
Iot	Internet of Things
k-NN	k-Nearest Neighbors
LBP	Local Binary Patterns
LF	Low-Frequency
MLP	Multilayer Perceptron
MLR	Multinomial Logistic Regression
MN	Mixed Networks
MORE	Mindfulness-Oriented Recovery Enhancement
MPQ	Mcgill Pain Questionnaire
MRI	Magnetic Resonance Imaging
MVPA	Multivariate Pattern Analyses
PCA	Principal Component Analysis
PPI	Present Pain Intensity
PRI	Pain Rating Index
PSD	Power Espectral Density
PPG	Photoplethysmograph
RBM	Restricted Boltzmann Machine
RF	Random Forest
RM	Regression Models
RNN	Recurrent Neural Networks
ROI	Regions of Interest
RVM	Relevance Vector Machine
Semg	Surface Electromyogram
SFS	Sequential Forward Selection
SIFT	Scale-Invariant Feature Transform
SURF	Speeded Up Robust Features
SVM	Support Vector Machine
UFS	Univariate Feature Selection
VAS	Visual Analog Scale
VLF	Very-Low-Frequency
VR	Virtual Reality
WT	Wavelet Transform