title: Association among measures of mobility-related disability and self-perceived fatigue among older people: a population-based study.
abstract: OBJECTIVE
  To investigate the relationship between self-perceived fatigue with different physical functioning tests and functional performance scales used for evaluating mobility-related disability among community-dwelling older persons.
  
  
  METHODS
  This is a cross-sectional, population-based study. The sample was composed of older persons with 65 years of age or more living in Cuiabá, MT, and Barueri, SP, Brazil. The data for this study is from the FIBRA Network Study. The presence of self-perceived fatigue was assessed using self-reports based on the Center for Epidemiologic Studies-Depression Scale. The Lawton instrumental activities of daily living scale (IADL) and the advanced activities of daily living scale (AADL) were used to assess performance and participation restriction. The following physical functioning tests were used: five-step test (FST), the Short Physical Performance Battery (SPPB), and usual gait speed (UGS). Three models of logistic regression analysis were conducted, and a significance level of α<0.05 was adopted.
  
  
  RESULTS
  The sample was composed of 776 older adults with a mean age (SD) of 71.9 (5.9) years, of whom the majority were women (74%). The prevalence of self-perceived fatigue within the participants was 20%. After adjusting for covariates, SPPB, UGS, IADL, and AADL remained associated with self-perceived fatigue in the final multivariate regression model.
  
  
  CONCLUSIONS
  Our results suggest that there is an association between self-perceived fatigue and lower extremity function, usual gait speed and activity limitation and participation restriction in older adults. Further cohort studies are needed to investigate which physical performance measure may be able to predict the negative impact of fatigue in older adults.
authors.affiliation: Universidade Cidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Wuber J S
authors.initials: WJ
authors.lastname: Soares
authors.affiliation: Universidade Cidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Camila A
authors.initials: CA
authors.lastname: Lima
authors.affiliation: Faculdade de Ciências Humanas e da Saúde, Pontifícia Universidade Católica de São Paulo, São Paulo, SP, Brazil.
authors.forename: Tereza L
authors.initials: TL
authors.lastname: Bilton
authors.affiliation: Departamento de Clínica Médica, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Ferrioli
authors.affiliation: Departamento de Fisioterapia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors.forename: Rosângela C
authors.initials: RC
authors.lastname: Dias
authors.affiliation: Universidade Cidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Monica R
authors.initials: MR
authors.lastname: Perracini
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D001938:Brazil; D003430:Cross-Sectional Studies; D059026:Diagnostic Self Evaluation; D004185:Disability Evaluation; D006233:Persons with Disabilities; D005221:Fatigue / Q000175:diagnosis; D005260:Female; D006801:Humans; D008297:Male; D051346:Mobility Limitation; D014504:Urban Health