$a_i$	Linear acceleration of the centre of mass of body segment ‘i’
${\alpha }_i$	Angular acceleration around the centre of mass of the body segment ‘i’
ADL	Activities of daily living
ANN	Artificial neural network
BMI	Body mass index
CoM	Centre of mass
CoP	Centre of plantar pressure
DSP	Double-support phase
DoF	Degree of Freedom
FCM	Foot-ground contact model
GRF	Ground reaction force
$GR{F}_v$	Ground reaction force in the vertical direction
$GR{F}_{ap}$	Ground reaction force in the anterior-posterior direction
$GR{F}_{ml}$	Ground reaction force in the medial-lateral direction
GRM	Ground reaction moment
$I_i$	Second moment of inertia of the body segment ‘i’
ID	Inverse dynamics
IMU	Inertial measurement unit
$k_1$ and $k_2$	Empirical constants
$m_i$	Mass of the body segment ‘i’
$n_s$	Number of (solid) body segments
NRMSE	Normalised root mean square error
PCI-MI	Principal component analysis—mutual information
R	Cross-correlation coefficient
$r_i$	Moment arm pertinent to the body segment ‘i’
RMSE	Root mean square error
SLR	Stepwise linear regression
SSP	Single-support phase
$T_{ds}$	Half of the double-support duration
WNN	Wavelet neural network