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Validity and reliability of linear encoder muscle power testing in persons with Parkinson's disease.
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- Author(s): Bonde-Jensen, Frederik; Dalgas, Ulrik; Hvid, Lars Grøndahl; Langeskov-Christensen, Martin
- Source:
Clinical Rehabilitation. May2024, Vol. 38 Issue 5, p678-687. 10p. - Source:
- Additional Information
- Subject Terms: DRUG therapy for Parkinson's disease; MULTITRAIT multimethod techniques; SECONDARY analysis; RESEARCH funding; ACADEMIC medical centers; T-test (Statistics); RESEARCH evaluation; FUNCTIONAL assessment; PARKINSON'S disease; MUSCLE strength testing; DESCRIPTIVE statistics; MUSCLE strength; RESISTANCE training; RESEARCH methodology; INTRACLASS correlation; COMPARATIVE studies; DATA analysis software; CONFIDENCE intervals; EVALUATION
- Subject Terms:
- Abstract: Objective: To investigate the construct validity ON medication and the reliability both ON and OFF medication of linear encoder muscle power testing in persons with Parkinson's disease (pwPD). Design: A study using baseline data from one randomized controlled trial (study 1) and one cohort study (study 2). Setting: University exercise lab. Participants: Study 1: 35 healthy controls and 70 pwPD. Study 2: 20 pwPD. Intervention: Study 1: baseline data. Study 2: 4 chair rise tests (2 ON and 2 OFF medication), in a randomized order, separated by 4 to 16 days. Main measures: Linear encoder data were collected from a chair rise test. Known groups validity and convergent validity (i.e., construct validity) were assessed by comparing peak power between pwPD and healthy controls and associations between peak power and functional performance (i.e., 6-Min Walk Test, Timed Up and Go Test, Six-Spot Step Test), respectively. Reliability was assessed as day-to-day variation and by intraclass correlation coefficients. Results: Peak power was comparable between pwPD and healthy controls (−7.2%, p = 0.17), but lower in moderately impaired pwPD compared to mildly impaired pwPD (−27%, p < 0.01) and healthy controls (−23%, p < 0.01). Moderate to strong associations were observed between peak power and functional performance (r2 = 0.44–0.51). Day-to-day variation ON and OFF medication were 1.0 and 1.3 W/kg, respectively, while intraclass correlation coefficients were 0.95 (0.87;0.98) and 0.93 (0.82;0.97), respectively. Conclusion: Linear encoder muscle power testing shows inconsistent known groups validity, acceptable convergent validity ON medication, and excellent day-to-day reliability ON and OFF medication in pwPD. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Clinical Rehabilitation is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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