PD	Parkinson’s disease
EMG	Surface electromyography
NMF	Non-negative matrix factorization
MMF	Multimodal matrix factorization
W	Weight matrix
H	Shared temporal structure
C	Temporal coefficients
R2	Reconstruction performance
VAF	Variance accounted for
IMU	Inertial measurement unit
6MWT	6-min walk test
ACE-III	Addenbrooke’s Cognitive Examination-III
UPDRS-III	Unified Parkinson’s Disease Rating Scale, Part III
MDS-UPDRS	Movement Disorder Society-sponsored revision of the Unified Parkinson’s Disease Rating Scale
PIGD	Postural instability and gait difficulty
FOG	Freezing of gait
RF	Rectus femoris
BF	Biceps femoris
TA	Tibialis anterior
LG	Lateral gastrocnemius
SOL	Soleus
L	Left
R	Right