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Reproducibility and Convergent Validity of the Sitting-Rising Test in People With Multiple Sclerosis

Published:February 10, 2021DOI:https://doi.org/10.1016/j.apmr.2021.01.079

      Highlights

      • This is the first study to assess the psychometric properties of the sitting-rising test (SRT) in people with multiple sclerosis.
      • The SRT test-retest reproducibility was proved to be excellent.
      • Strong correlations exist between the SRT, functional mobility, and strength.
      • Moderate correlations were found between the SRT and postural control measures.
      • The SRT score did not differentiate between fallers and nonfallers with multiple sclerosis.

      Abstract

      Objective

      To evaluate the test-retest reproducibility and convergent validity of the sitting-rising test (SRT) in people with multiple sclerosis (PwMS).

      Design

      Observational study comprising a test-retest design.

      Setting

      Multiple Sclerosis Center, Rehabilitation Hospital at Sheba Medical Center, Tel-Hashomer, Israel.

      Participants

      A total of 50 PwMS (32 women, 18 men, N=50), mean age 44.8±7.6 years and mean disease duration of 13.8±8.5 years since diagnosis, were enrolled in the study. The median Expanded Disability Status Scale score was 4.5, indicating a mild-moderate neurologic disability.

      Interventions

      Not applicable.

      Main Outcome Measures

      SRT, posturography measures, 10-repetion sit-to-stand test (10STS), timed Up and Go (TUG) test, hand grip strength, strength of hip flexion/extension/abduction, knee flexion/extension, and Fall Status Questionnaire.

      Results

      The intraclass correlation coefficient value for the intrarater test-retest reproducibility (7- to 10-day interval between tests) of the SRT test, was 0.931 (95% confidence interval, 0.796-0.977). Strong correlations were found between the SRT, TUG test (ρ=−0.709), and 10STS (ρ=−0.719), and moderate correlations were found between the SRT and postural control measures (ρ∼0.4). Moderate correlations were found between the SRT and the hip and knee strength (combined) of the weaker limb (ρ=0.344). No differences were found in the SRT score between fallers and nonfallers.

      Conclusions

      The current study supports the convergent validity and test-retest reproducibility of the SRT in PwMS.

      Keywords

      List of abbreviations:

      COP (center of pressure), EDSS (Expanded Disability Status Scale), ICC (intraclass correlation coefficient), MDC (minimal detectable change), MS (multiple sclerosis), PwMS (people with multiple sclerosis), SRT (sitting-rising test), 10STS (10-repetition sit-to-stand test), TUG (timed Up and Go)
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