title: Decline in gait performance detected by an electronic walkway system in 907 older adults of the population-based KORA-Age study.
abstract: BACKGROUND
  Gait changes at older ages are a strong predictor of a decline in lower extremity functions. However, large population-based studies assessing gait parameters in various gait tasks are lacking.
  
  
  OBJECTIVE
  We investigated the relationship of age, the use of mobility aids and being fitted with an endoprosthesis with selected gait parameters, assessed in different walking tasks.
  
  
  METHODS
  In the population-based KORA-Age study, data from 907 men and women aged 65-91 years were obtained using the validated electronic walkway system GAITRite, which quantifies spatiotemporal gait parameters in the measurement range of a 488 × 61 cm walkway mat. Participants completed three walking tasks at different speeds (normal, slow and fast) and a fourth walking task at normal speed with the additional task of counting backwards (dual-task walking). Additionally, the impact of endoprostheses (hip or knee) and mobility aids was assessed.
  
  
  RESULTS
  The highest relative age-related decline for velocity was observed during dual-task walking (26.1% for men and 23.4% for women) and for step length during fast walking (20.2 and 14.4%) when comparing participants aged <70 years with those aged ≥85 years. Weaker performances for velocity, cadence and step length were observed among women with knee or hip endoprostheses (fast walking speed) (p < 0.05). Across all walking tasks, significant differences between mobility aid users and nonusers were observed for velocity and step length among both men and women (p < 0.05).
  
  
  CONCLUSIONS
  A decline in gait performance is most notable in fast speed and dual-task walking, in age-related endoprosthesis and mobility aid analyses. The marked relative decrease in gait parameters in these difficult gait tasks may be attributed to lacking resources for compensation among the elderly.
authors.affiliation: Institute of Epidemiology II, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany. christine.autenrieth@helmholtz-muenchen.de
authors.forename: Christine S
authors.initials: CS
authors.lastname: Autenrieth
authors.forename: Stefan
authors.initials: S
authors.lastname: Karrasch
authors.forename: Margit
authors.initials: M
authors.lastname: Heier
authors.forename: Lukas
authors.initials: L
authors.lastname: Gorzelniak
authors.forename: Karl-Heinz
authors.initials: KH
authors.lastname: Ladwig
authors.forename: Annette
authors.initials: A
authors.lastname: Peters
authors.forename: Angela
authors.initials: A
authors.lastname: Döring
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D002183:Canes; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D003446:Crutches; D005260:Female; D005684:Gait / Q000502:physiology*; D006622:Hip Prosthesis; D006801:Humans; D007720:Knee Prosthesis; D016014:Linear Models; D008297:Male; D051346:Mobility Limitation; D014853:Walkers