Background
The interpretability of change in exercise test scores is an important measurement
property. This study aimed to provide a framework for the interpretation of individual
change scores of the 10 metre incremental shuttle walk test (ISWT) in cardiac rehabilitation.
Methods
In a quantitative pre-post design study, 52 patients who were referred to a hospital
outpatient department for cardiac rehabilitation participated in this study. Participants
completed two ISWTs prior to cardiac rehabilitation. Post cardiac rehabilitation,
participants completed a global rating of change score and two ISWTs. Change scores
were analysed for smallest detectable change (SDC) and minimum important change (MIC).
Results
The SDC for an individual was 47 metres. The predicted MIC for participants to report
an improvement ranged from 70 to 92 metres. The predicted MIC for participants who
did not report a deterioration in the global rating of change (i.e., those who reported
unchanged or improved) ranged from 16 to 42 metres.
Conclusions
The MIC for patients who report any improvement in physical fitness and functional
capacity is 70 metres. These results suggest that over an 8-week program, patients
would need to improve by at least seven shuttles to perceive an improvement in their
physical fitness and functional capacity. Patients with small increases in the 10-metre
ISWT distance may still report deterioration in their physical fitness and functional
capacity.
Keywords
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Article Info
Publication History
Published online: December 04, 2018
Accepted:
November 23,
2018
Received:
November 7,
2018
Identification
Copyright
© 2018 Australian and New Zealand Society of Cardiac and Thoracic Surgeons (ANZSCTS) and the Cardiac Society of Australia and New Zealand (CSANZ). Published by Elsevier B.V. All rights reserved.
