title: Reliability of a portable gas analyzer during a 5-min walk test.
abstract: OBJECTIVE
  To determine the reliability of a gas analyzer while assessing oxygen consumption (.VO2) during a 5-min walking test.
  
  
  METHODS
  Forty healthy participants were connected to the KB1-C and walked for 5 mins on a 5-m walkway. Total .VO2 or energy expenditure (EE) was obtained by averaging the samples for each minute for 5 mins. of walking. Walk distance (D), gait speed (S), and gait energy cost (C) were also evaluated.
  
  
  RESULTS
  The ICC(2,1) for EE, D, S, and C were 0.88, 0.92, 0.92, and 0.67, respectively. The coefficient of variation across trials for each variable was 7.4, 3.6, 3.2, and 9%, respectively.
  
  
  CONCLUSIONS
  All but C generated high coefficients of reliability. All variables demonstrated acceptable test-retest variability. There was low variability between participants for C.
authors.affiliation: Centro Universitário de Belo Horizonte, Rua Ernani Agricola 50/302, 30455-760 Belo Horizonte, MG, Brazil.
authors.forename: Inácio Teixeira
authors.initials: IT
authors.lastname: da Cunha-Filho
authors.forename: Helene
authors.initials: H
authors.lastname: Henson
authors.forename: Elizabeth J
authors.initials: EJ
authors.lastname: Protas
mesh_terms: D000293:Adolescent; D000328:Adult; D004734:Energy Metabolism; D004867:Equipment Design; D005260:Female; D005684:Gait; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D015203:Reproducibility of Results; D016138:Walking