Reliability of a portable gas analyzer during a 5-min walk test

Inácio Teixeira Da Cunha-Filho, Helene Henson, Elizabeth J. Protas

Research output: Contribution to journalArticle

4 Scopus citations


OBJECTIVE: To determine the reliability of a gas analyzer while assessing oxygen consumption (&OV0312;O2) during a 5-min walking test. DESIGN: Forty healthy participants were connected to the KB1-C and walked for 5 mins on a 5-m walkway. Total &OV0312;O2 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 ICC2,1 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. CONCLUSION: All but C generated high coefficients of reliability. All variables demonstrated acceptable test-retest variability. There was low variability between participants for C.

Original languageEnglish (US)
Pages (from-to)469-473
Number of pages5
JournalAmerican Journal of Physical Medicine and Rehabilitation
Issue number6
StatePublished - Jun 1 2007


  • Gait
  • Oxygen Consumption
  • Reliability
  • Walking

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation

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