PD	Parkinson’s disease
BW	Backward walking
BG	Backward gait
FW	Forward walking
PHQ	Patient Health Questionnaire
H&Y	Hoehn and Yahr
CDR	Clinical dementia rating
MMSE	Mini-Mental State Examination
UPDRS	Unified Parkinson’s Disease Rating Scale
MDS	Movement Disorder Society
i10-min-WT	Instrumented-10 min-walking test
BWT	Backward walking training
FG	Forward gait
BWG	Backward walking group
FWG	Forward walking group
SBT	Standing balance training
MoCA	Montreal Cognitive Assessment
ADLs	Activities of daily living
SCOPA-AUT	Scales for Outcomes in Parkinson’s Disease–Autonomic Dysfunction
ROM	Range of motion
BBS	Berg Balance Scale
RCT	Randomized control trial
3MBWT	3-Meter Backward Walk Test
50FWT	50-Foot Walk Test
TUG	Timed Up and Go
FTST	Five Times Sit to Stand Test
PIGD	Postural Instability and Gait Difficulty
FOG	Freezing of gait