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Repeatability of the Six-Minute Walk Test and Relation to Physical Function in Survivors of a Critical Illness.
MedLine Citation:
PMID:  22577064     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Objectives.To evaluate, in survivors of a critical illness: 1) the repeatability of the 6MWT performed at home; 2) the effect on estimates of change in functional exercise capacity if only one 6MWT was performed at follow-up assessments; 3) the relationship between physical functioning (PF) score of the SF-36 and the 6MWT.Design.Repeated measures of 6MWT and SF-36 Health Survey METHODS:Eligible participants had an ICU length of stay ≥48 hours and mechanically ventilated for ≥24 hours. Two 6MWT and the SF-36 were conducted in participants' homes at Weeks 1, 8, and 26 after hospital discharge. RESULTS: 173 participants, mean(SD) age 57(16) years, APACHE II score on admission 19(10), ICU length of stay 9(8) days and mechanical ventilation time 140(137) hours, completed the study. Of the 173 participants, 110 performed two 6MWTs at Week 1, 8 and 26. there was a significant mean increase in six minute walk distance (6MWD) in the second test at each assessment of 15 meters (p<0.0001), 13 meters (p<0.0001) and 9 meters (p=0.04) at Weeks 1, 8 and 26 respectively. If only one 6MWT was performed at Week 8 and 26, the estimate of change in 6MWD from Week1 was less by 19 meters (p<0.001) at both Week 8 and 26. There was a moderate to strong correlation between PF and 6MWD at each assessment (r=0.62 p<0.001, r=0.55 p<0.001, r=0.47 p<0.001, at Week 1, 8 and 26, respectively). CONCLUSIONS:In survivors of a critical illness, the 6MWT in the home environment should be performed twice at each assessment to give an accurate reflection of change in exercise capacity over time. Physical function was a strong indicator of 6MWT distance.
Authors:
Jennifer A Alison; Patricia Kenny; Madeleine T King; Sharon McKinley; Leanne M Aitken; Gavin D Leslie; Doug Elliott
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-10
Journal Detail:
Title:  Physical therapy     Volume:  -     ISSN:  1538-6724     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0022623     Medline TA:  Phys Ther     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
J.A. Alison, Discipline of Physiotherapy, University of Sydney.
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