Citation

Kaye J, Mattek N, Dodge HH, Buracchio T, Austin D, Hagler S, Pavel M, Hayes T. Gait Posture 2012; 35(2): 197-202.

Affiliation

Oregon Center for Aging & Technology, Oregon Health & Science University, United States; Department of Neurology, Oregon Health & Science University, United States; Neurology Service, Portland Veteran Affairs Medical Center, United States; Department of Biomedical Engineering, Oregon Health & Science University, United States.

Copyright

(Copyright © 2012, Elsevier Publishing)

DOI

10.1016/j.gaitpost.2011.09.006

PMID

22047773

PMCID

PMC3278504

Abstract

Physical performance measures predict health and function in older populations. Walking speed in particular has consistently predicted morbidity and mortality. However, single brief walking measures may not reflect a person's typical ability. Using a system that unobtrusively and continuously measures walking activity in a person's home we examined walking speed metrics and their relation to function. In 76 persons living independently (mean age, 86) we measured every instance of walking past a line of passive infra-red motion sensors placed strategically in their home during a four-week period surrounding their annual clinical evaluation. Walking speeds and the variance in these measures were calculated and compared to conventional measures of gait, motor function and cognition. Median number of walks per day was 18±15. Overall mean walking speed was 61±17cm/s. Characteristic fast walking speed was 96cm/s. Men walked as frequently and fast as women. Those using a walking aid walked significantly slower and with greater variability. Morning speeds were significantly faster than afternoon/evening speeds. In-home walking speeds were significantly associated with several neuropsychological tests as well as tests of motor performance. Unobtrusive home walking assessments are ecologically valid measures of walking function. They provide previously unattainable metrics (periodicity, variability, range of minimum and maximum speeds) of everyday motor function.

Language: en