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KMID : 0928320110110010042
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Korean Journal of Health Promotion and Disease Prevention
2011 Volume.11 No. 1 p.42 ~ p.47
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Use of the 6-Minute Walk Test as Gait Therapy for Hemiplegic Patients: Possibility of Practice Effect by Providing Knowledge of Result
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Sim Sun-Mi
Oh Duck-Won
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Abstract
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Background: This study aimed to investigate the practice effect of the 6-minute walk test (6MWT) after providing the subjects with knowledge of the results (KR).
Sixteen subjects with post-stroke hemiparesis volunteered to participate in this study. The 6MWT was performed by having the subjects take repeated walks along a 20-m walkway for 6 minutes; and the maximum distance walked was recorded. Two trials of the 6MWT were conducted under three conditions: no-KR, immediate- KR (providing knowledge of the time taken to complete each 20-m distance), and summary-KR (providing knowledge of the time taken to complete 60 m).
Results: The practice effects of all 3 conditions were determined by using the paired t-test, intraclass correlation coefficient (ICC) with <0.75, and the Bland-Altman plot. The findings of the paired t-test showed a significant difference under the immediate-KR condition only; however, no significant differences were noted under the no-KR and summary-KR conditions. In a data agreement analysis across the two trials using the ICC, none of the obtained values under the three conditions were in an acceptable range indicative of a practice effect. In the Bland-Altman plot, a greater data variation was observed under the immediate-KR condition than under the other two conditions. When comparing the conditions, the immediate-KR condition differed significantly from the no-KR condition.
Conclusions: Our findings do not support the presence of a practice effect across the 6MWT. However, a practice effect seems to be clinically possible when the immediate-KR condition is incorporated into this test.
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KEYWORD
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6-minute walk test, Knowledge of result, Practice effect, Hemiparesis
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