Clinimetric properties of the Tinetti Mobility Test, Four Square Step Test, Activities-specific Balance Confidence Scale, and spatiotemporal gait measures in individuals with Huntington's disease

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Abstract

Individuals with Huntington's disease (HD) experience balance and gait problems that lead to falls. Clinicians currently have very little information about the reliability and validity of outcome measures to determine the efficacy of interventions that aim to reduce balance and gait impairments in HD. This study examined the reliability and concurrent validity of spatiotemporal gait measures, the Tinetti Mobility Test (TMT), Four Square Step Test (FSST), and Activities-specific Balance Confidence (ABC) Scale in individuals with HD. Methods: Participants with HD [n=20; mean age. ±. SD=50.9. ±. 13.7; 7 male] were tested on spatiotemporal gait measures and the TMT, FSST, and ABC Scale before and after a six week period to determine test-retest reliability and minimal detectable change (MDC) values. Linear relationships between gait and clinical measures were estimated using Pearson's correlation coefficients. Results: Spatiotemporal gait measures, the TMT total and the FSST showed good to excellent test-retest reliability (ICC. >. 0.75). MDC values were 0.30. m/s and 0.17. m/s for velocity in forward and backward walking respectively, four points for the TMT, and 3. s for the FSST. The TMT and FSST were highly correlated with most spatiotemporal measures. The ABC Scale demonstrated lower reliability and less concurrent validity than other measures. Conclusions: The high test-retest reliability over a six week period and concurrent validity between the TMT, FSST, and spatiotemporal gait measures suggest that the TMT and FSST may be useful outcome measures for future intervention studies in ambulatory individuals with HD.

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Kloos, A. D., Fritz, N. E., Kostyk, S. K., Young, G. S., & Kegelmeyer, D. A. (2014). Clinimetric properties of the Tinetti Mobility Test, Four Square Step Test, Activities-specific Balance Confidence Scale, and spatiotemporal gait measures in individuals with Huntington’s disease. Gait and Posture, 40(4), 647–651. https://doi.org/10.1016/j.gaitpost.2014.07.018

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