IoT	Internet of Things
EE	Energy expenditure
PA	Physical activity
CVD	Cardiovascular disease
HRV	Heart rate variability
HR	Heart rate
ECG	Electrocardiogram
PPG	Photoplethysmogram
ANN	Artificial neural network
CNN	Convolutional neural network
GRU	Gated recurrent unit
GAP	Global average pooling
Bi-GRU	Bidirectional gated recurrent unit
FC	Fully connected
MSE	Mean squared error
LOSO	Leave-one-subject-out
RMSE	Root-mean-square error
MAE	Mean absolute error
$R^2$	Coefficient of determination
LOA	Limit of agreement
MAPE	Mean absolute percent error
ANOVA	Analysis of variance