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Six-minute walk test in adults with cerebral palsy. A study of reliability

Lena Asztalos

Eva Mattsson

Neurotec Department, Division of Physiotherapy, Karolinska Institutet, Karolinska University Hospital, Solna, Stockholm, Sweden

Objective: To determine the reliability of a six-minute walk test in adults with cerebral palsy.

Design: Four repeated walk tests during two weeks.

Setting: The tests were conducted in a 40-m-long corridor at a rehabilitation centre for outpatients.

Subjects: Twenty-five adults (9 women and 16 men) with CP. Mean age 36 (26 58) years. Twelve subjects walked with walking aids and 13 without.

Interventions: No intervention.

Measures: The subjects were instructed to walk as far as possible for 6 min. The distance walked, heart rate and perceived exertion were assessed.

Results: Mean distances walked by the subjects in the four tests were 316, 336, 341 and 345 m. The repeatability between test 1 and the other tests was 66 m, and when the first walk test was excluded 40 m. The coefficient of variation (CV) between test 1 and the other tests varied between 7.1 and 8.7%, and when the first walk test was excluded between 3.7 and 4.5%. Intraclass correlation (ICC 1.1) was 0.97 in the four tests, and when the first walk test was excluded 0.99. Walking distance was longer (P<0.01) and varied less in subjects walking without walking aids (n=13) compared with subjects using walking aids (n=12).

Conclusions: Six-minute walk test showed high reliability, with a repeatability of 40 m. One practice test is recommended, as the walking distance in the first test was significantly shorter (P B=0.01) than the other three tests.

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