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Reliability of a portable gas analyzer during a 5-min walk test
Inácio Teixeira da Cunha-Filho1, Helene Henson, Elizabeth J Protas
1Centro Universitário de Belo Horizonte, Rua Ernani Agricola 50/302, 30455-760 Belo Horizonte, MG, Brazil.
Objective:
To determine the reliability of a gas analyzer while assessing oxygen consumption (.VO2) 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 .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.
Conclusion:
All but C generated high coefficients of reliability. All variables demonstrated acceptable test-retest variability. There was low variability between participants for C.
