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Furthermore, we compare ACI with classical gait metrics to determine its efficacy relative to established methods. A 4 \u00d7 200 m indoor walking test with a triaxial accelerometer attached to the lower back was used to compare gait patterns of younger (N = 42) and older adults (N = 60) during normal and metronome walking. The other linear and non-linear gait metrics were movement intensity, gait regularity, local dynamic stability (maximal Lyapunov exponents), and scaling exponent (detrended fluctuation analysis). In contrast to other gait metrics, ACI demonstrated a specific sensitivity to metronome walking, with both young and old participants exhibiting altered stride interval correlations. Furthermore, there was a significant difference between the young and old groups (standardized effect size: \u22120.77). Additionally, older participants exhibited slower walking speeds, a reduced movement intensity, and a lower gait regularity. The ACI is likely a sensitive marker for attentional load and can effectively discriminate age-related changes in gait patterns. Its ease of measurement makes it a promising tool for gait analysis in unsupervised (free-living) conditions.<\/jats:p>","DOI":"10.3390\/s24237427","type":"journal-article","created":{"date-parts":[[2024,11,21]],"date-time":"2024-11-21T06:57:54Z","timestamp":1732172274000},"page":"7427","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Validity of Linear and Nonlinear Measures of Gait Variability to Characterize Aging Gait with a Single Lower Back Accelerometer"],"prefix":"10.3390","volume":"24","author":[{"given":"Sophia","family":"Piergiovanni","sequence":"first","affiliation":[{"name":"Haute-Ecole Arc Sant\u00e9, HES-SO University of Applied Sciences and Arts Western Switzerland, 2000 Neuch\u00e2tel, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3693-4505","authenticated-orcid":false,"given":"Philippe","family":"Terrier","sequence":"additional","affiliation":[{"name":"Haute-Ecole Arc Sant\u00e9, HES-SO University of Applied Sciences and Arts Western Switzerland, 2000 Neuch\u00e2tel, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,11,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1016\/S0966-6362(97)01118-1","article-title":"Gait in the Elderly","volume":"5","author":"Prince","year":"1997","journal-title":"Gait Posture"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"340","DOI":"10.1093\/ptj\/70.6.340","article-title":"Biomechanical Walking Pattern Changes in the Fit and Healthy Elderly","volume":"70","author":"Winter","year":"1990","journal-title":"Phys. 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