Abstract
Objective: The most common methods to calculate energy costs are based on measured oxygen uptake
during walking a standardized distance or time. Unfortunately, it is unclear which
method is most reliable to determine energy cost of walking in stroke survivors. The
objective of this study was to evaluate the 3 most commonly used methods for calculating
oxygen consumption and -cost by assessing test-retest reliability and measurement
error in community dwelling chronic stroke survivors during a 6 Minute Walk Test.
Methods: In this secondary analysis of a longitudinal study, reproducibility of the outcome
of walking distance, walking speed, oxygen consumption and oxygen cost from 3 methods
(Kendall's tau, assumed steady-state and total walking time oxygen consumption) were
determined using Intraclass Correlation Coefficient, Standard Error of Measurement
and Smallest Detectable Change. Results:20 from the 31 participants successfully performed the 6 minute walk test-retest within
a timeframe of 1 month. Within the 2 tests the reproducibility of walking distance
and walking speed was high. The 3 methods to determine reproducibility for oxygen
cost and oxygen consumption were considered good (Kendall's tau), good (assumed steady-state)
and excellent (total walking time). Conclusions: The method using oxygen consumption and -cost over the total walking time resulted
in the highest reproducibility considering the Intraclass Correlation Coefficient,
its 95% Confidence Interval, and smaller absolute differences.
Key Words
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Article info
Publication history
Published online: January 29, 2020
Accepted:
December 31,
2019
Received in revised form:
November 5,
2019
Received:
June 5,
2019
Identification
DOI: https://doi.org/10.1016/j.jstrokecerebrovasdis.2020.104637
Copyright
© 2020 Elsevier Inc. All rights reserved.
