Database	Key Terms, Algorithm, and Number of Articles Extracted
PubMed/Medline (611)	((walk OR ambulatory OR mobility OR gait) AND (variability OR complexity OR unsteadiness or inconsist* OR stability OR equilibrium OR dynamics OR balance OR ataxia) AND (“neurological disorder” OR “neurological pathology” OR “multiple sclerosis” OR “Parkinson’s disease” OR “Huntington’s disease” OR ALS OR “cerebellar ataxia” OR Alzheimer OR stroke) AND (intervention OR therapy OR treatment OR “best practices”) AND (older adults OR elderly OR aged OR elder OR older OR senior OR geriatric) NOT (musculoskeletal OR posture OR postural OR animal OR robot OR amputee OR trunk OR knee OR Hip OR freezing of gait OR spasticity OR heart OR blood OR cardiac)) Refined by: LANGUAGES: (ENGLISH) Refined by: AGES: (Middle Aged: 45–64; Aged: 65+ years) Refined by: PUBLICATION DATES: (From 1 January 2000 to 31 December 2021) Total articles extracted: 611
CINAHL (125)	((walk OR ambulatory OR mobility OR gait) AND (variability OR complexity OR unsteadiness or inconsist* OR stability OR equilibrium OR dynamics OR balance OR ataxia) AND (“neurological disorder” OR “neurological pathology” OR “multiple sclerosis” OR “Parkinson’s disease” OR “Huntington’s disease” OR ALS OR “cerebellar ataxia” OR Alzheimer) AND (intervention OR therapy OR treatment OR “best practices”) AND (older adults OR elderly OR aged OR elder OR older OR senior OR geriatric) NOT (posture OR postural OR animal OR robot OR amputee OR trunk OR knee OR Hip OR freezing of gait OR spasticity OR heart OR blood OR cardiac)) Total articles extracted: 125
Scopus (732)	(walk OR ambulatory OR mobility OR gait OR locomot*) AND (variability OR complexity OR unsteadiness OR inconsist* OR stability OR equilibrium OR dynamics OR balance OR ataxia) AND ((“neurological disorder” OR “neurological pathology” OR “multiple sclerosis” OR “Parkinson’s disease” OR “Huntington’s disease” OR als OR “cerebellar ataxia” OR alzheimer)) AND ((intervention OR therapy OR treatment OR “best practices”)) AND ((older AND adults OR elderly OR aged OR elder OR older OR senior OR geriatric)) AND NOT ((posture OR postural OR animal OR robot OR amputee OR trunk OR knee OR hip OR freezing AND of AND gait OR spasticity OR heart OR blood OR cardiac OR depression)) AND (LIMIT-TO (LANGUAGE, “English”)) AND (LIMIT-TO (EXACTKEYWORD, “Gait Disorder”) OR LIMIT-TO (EXACTKEYWORD, “Elderly”) OR LIMIT-TO (EXACTKEYWORD, “Gait”)) AND (LIMIT- TO (PUBYEAR, 2021) OR LIMIT-TO (PUBYEAR, 2020) OR LIMIT- TO (PUBYEAR, 2019) OR LIMIT-TO (PUBYEAR, 2018) OR LIMIT- TO (PUBYEAR, 2017) OR LIMIT-TO (PUBYEAR, 2016) OR LIMIT- TO (PUBYEAR, 2015) OR LIMIT-TO (PUBYEAR, 2014) OR LIMIT- TO (PUBYEAR, 2013) OR LIMIT-TO (PUBYEAR, 2012) OR LIMIT- TO (PUBYEAR, 2011) OR LIMIT-TO (PUBYEAR, 2010) OR LIMIT- TO (PUBYEAR, 2009) OR LIMIT-TO (PUBYEAR, 2008) OR LIMIT- TO (PUBYEAR, 2007) OR LIMIT-TO (PUBYEAR, 2006) OR LIMIT- TO (PUBYEAR, 2005) OR LIMIT-TO (PUBYEAR, 2004) OR LIMIT- TO (PUBYEAR, 2003) OR LIMIT-TO (PUBYEAR, 2002) OR LIMIT- TO (PUBYEAR, 2001) OR LIMIT-TO (PUBYEAR, 2000)) AND (LIMIT- TO (PUBSTAGE, “final”)) AND (LIMIT-TO (DOCTYPE, “ar”)) Total articles extracted: 732
Web of Science (314)	(TS = (walk OR locomot* OR ambulatory OR mobility OR gait) AND TS = (variability OR complexity OR unsteadiness or inconsist* OR stability OR equilibrium OR dynamics OR balance OR ataxia) AND TS = (“neurological disorder” OR “neurological pathology” OR “multiple sclerosis” OR “Parkinson’s disease” OR “Huntington’s disease” OR ALS OR “cerebellar ataxia” OR Alzheimer) AND TS = (intervention OR therapy OR treatment OR “best practices”) AND TS = (older adults OR elderly OR aged OR elder OR older OR senior OR geriatric) NOT TS = (posture OR postural OR dual task OR animal OR robot OR amputee OR trunk OR knee OR Hip OR freezing of gait OR spasticity OR heart OR blood OR cardiac OR depression)) AND LANGUAGE: (English) AND DOCUMENT TYPES: (Article) Timespan: 2000–2021. Indexes: SCI-EXPANDED. Total articles extracted: 314