title: Factors associated with maximal walking speed among older community-living adults.
abstract: OBJECTIVE
  The relative contribution of different domains on walking speed is largely unknown. This study investigated the central factors associated with maximal walking speed among older people.
  
  
  METHODS
  Cross-sectional analyses of baseline data from the SCAMOB study (ISRCTN 07330512) involving 605 community-living ambulatory adults aged 75-81 years. Maximal walking speed, leg extensor power, standing balance and body mass index were measured at the research center. Physical activity, smoking, use of alcohol, chronic diseases and depressive symptoms were self-reported by standard questionnaires.
  
  
  RESULTS
  The mean maximal walking speed was 1.4 m/s (range 0.3-2.9). In linear regression analysis, age, gender and body mass index explained 11% of the variation in maximal walking speed. Adding leg extensor power and standing balance into the model increased the variation explained to 38%. Further adjusting for physical activity, smoking status and use of alcohol increased the variation explained by an additional 7%. A minor further increase in variability explained was gained by adding chronic diseases and depressive symptoms to the model. In the final model, the single most important factors associated with walking speed were leg extensor power, standing balance and physical activity, and these associations were similar in men and women and in different body mass index categories.
  
  
  CONCLUSIONS
  Lower extremity impairment and physical inactivity were the central factors associated with slow walking speed among older people, probably because these factors capture the influences of health changes and other life-style factors, potentially leading to walking limitations.
authors.affiliation: The Finnish Centre for Interdisciplinary Gerontology, Department of Health Sciences, University of Jyväskylä, Finland. janne.sallinen@vtt.fi
authors.forename: Janne
authors.initials: J
authors.lastname: Sallinen
authors.forename: Minna
authors.initials: M
authors.lastname: Mänty
authors.forename: Raija
authors.initials: R
authors.lastname: Leinonen
authors.forename: Mauri
authors.initials: M
authors.lastname: Kallinen
authors.forename: Timo
authors.initials: T
authors.lastname: Törmäkangas
authors.forename: Eino
authors.initials: E
authors.lastname: Heikkinen
authors.forename: Taina
authors.initials: T
authors.lastname: Rantanen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D005260:Female; D005387:Finland; D005684:Gait; D016852:Housing for the Elderly; D006801:Humans; D008297:Male; D008954:Models, Biological; D011187:Posture; D016032:Randomized Controlled Trials as Topic; D016138:Walking