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Meas."],"published-print":{"date-parts":[[2026,8,31]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    <jats:italic>Objective.<\/jats:italic>\n                    Gait and the timed up and go (TUG) time are the two tests that are widely used to assess functional mobility; however, their administration requires space and trained personnel, limiting feasibility for routine assessment. A brief, seated foot-tapping test may offer a practical alternative. This study examined whether accelerometer-derived features from unilateral foot-tapping can predict gait and TUG times across the adult lifespan.\n                    <jats:italic>Approach.<\/jats:italic>\n                    Seventy-eight adults aged 19\u201395 years (58 older adults: 80.25 \u00b1 8.2 yrs; 20 young-to-midlife: 32.2 \u00b1 14.1 yrs) performed 30-second unilateral foot-tapping trials with the dominant and nondominant foot. Time, frequency, and time\u2013frequency domain features were extracted from triaxial accelerometer signals. Least absolute shrinkage and selection operator (LASSO) and Random Forest regression models were trained within a nested 5-fold cross-validation to predict gait and TUG.\n                    <jats:italic>Main Results.<\/jats:italic>\n                    Significant correlations (\n                    <jats:italic>p<\/jats:italic>\n                    &lt; 0.05) were observed between foot-tapping features and both outcomes, with coefficients ranging from \u22120.5 to \u22120.35 for gait time and \u22120.6 to 0.55 for TUG time. Most of the corrected features were derived from time\u2013frequency domain (\u223c65%) and time domain (\u223c35%), with the strongest associations observed for tapping rate, inter-tap variability, and variability in instantaneous tapping energy across trials. LASSO achieved lower average root mean square error (RMSE) than Random Forest for dominant-foot gait time (0.88 \u00b1 0.23 s vs. 0.93 \u00b1 0.21 s) and TUG time (2.76 \u00b1 0.60 s vs. 2.88 \u00b1 0.65 s), and for nondominant-foot gait time (0.89 \u00b1 0.20 s vs 0.90 \u00b1 0.20 s), and TUG time (2.93 \u00b1 0.54 s vs. 2.96 \u00b1 0.55 s). Prediction of both outcomes using the dominant foot with LASSO resulted in a lower RMSE than the nondominant foot.\n                    <jats:italic>Significance.<\/jats:italic>\n                    These findings suggest that accelerometer-based unilateral foot tapping may serve as a fast, space efficient, and low-burden complement to conventional mobility assessments. Further validation in larger clinical populations and comparison with additional regression methods are warranted.\n                  <\/jats:p>","DOI":"10.1088\/1361-6579\/ae8ca9","type":"journal-article","created":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T22:55:55Z","timestamp":1784328955000},"page":"085004","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Predicting gait and timed up and go time using foot-tapping test and accelerometer"],"prefix":"10.1088","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-1698-7927","authenticated-orcid":true,"given":"Shamim","family":"Noroozi","sequence":"first","affiliation":[{"name":"University of British Columbia Okanagan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-6448-8065","authenticated-orcid":true,"given":"Jacquelyn","family":"Puckey","sequence":"additional","affiliation":[{"name":"University of British Columbia Okanagan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sabine","family":"Weyand","sequence":"additional","affiliation":[{"name":"University of British Columbia Okanagan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8613-7275","authenticated-orcid":true,"given":"Jennifer M","family":"Jakobi","sequence":"additional","affiliation":[{"name":"University of British Columbia Okanagan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,8,11]]},"reference":[{"key":"pmeaae8ca9bib1","doi-asserted-by":"publisher","first-page":"881","DOI":"10.1007\/s12603-009-0246-z","type":"journal-article","article-title":"Gait speed at usual pace as a predictor of adverse outcomes in community-dwelling older people an International Academy on Nutrition and Aging (IANA) Task Force","volume":"13","author":"Abellan Van Kan","year":"2009","journal-title":"J. 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