Reliability and validity of Alternate Step Test times in subjects with chronic stroke
Mandy M.L. Chung , Rebecca W.Y. Chan , Ying-Ki Fung, Shirley S.M. Fong , Stefanie S.L. Lam , Charles W.K. Lai , Shamay S. M. Ng
Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong
Objective: (i) To investigate the intra-rater, inter-rater and test-retest reliability and minimal detectable change of the Alternate Step Test (AST) when assessing people with chronic stroke. (ii) To quantify the correlation between AST times and stroke-specific impairments.
Design: Cross-sectional study.
Setting: University-based rehabilitation centre.
Participants: A convenience sample of 86 participants: 45 with chronic stroke, and 41 healthy elderly subjects.
Methods: The AST was administered along with the Fugl-Meyer Lower Extremity Assessment (FMA-LE), the Five Times Sit-To-Stand Test (FTSTS), limits of stability (LOS) measurements, Berg Balance Scale (BBS) scores, Chinese-translated Activities-specific Balance Confidence Scale (ABC-C) ratings, and the Timed “Up and Go” test (TUG).
Results: Excellent intra-rater, inter-rater and test-retest reliability were found, with a minimal detectable change of 3.26 s. AST times were significantly associated with FMA-LE assessment, FTSTS times, LOS in the forward and backward directions and to the affected side, BBS ratings and TUG times.
Conclusion: AST time is a reliable assessment tool that correlates with different stroke-specific impairments in people with chronic stroke.
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