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Related Experiment Video

Updated: Dec 19, 2025

Measurements of Motor Function and Other Clinical Outcome Parameters in Ambulant Children with Duchenne Muscular Dystrophy
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Assessing Motor Function in Congenital Muscular Dystrophy Patients Using Accelerometry.

Tokunbor A Lawal, Joshua J Todd, Jeffrey S Elliott

    The Journal of Neuroscience Nursing : Journal of the American Association of Neuroscience Nurses
    |June 9, 2020
    PubMed
    Summary

    Accelerometers underestimated step counts in children with congenital muscular dystrophy (CMD). Free-living activity monitoring revealed over 80% sedentary time, highlighting the need for triaxial accelerometry validation in CMD research.

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    Area of Science:

    • Neuromuscular Disorders
    • Biomedical Engineering
    • Physical Activity Measurement

    Background:

    • Assessing daily physical activity in congenital muscular dystrophy (CMD) is crucial for understanding disease impact.
    • Home-based activity monitoring may better reflect real-world motor performance than clinic-based tests.
    • The accuracy of accelerometry for step counting in pediatric CMD is not well-established.

    Purpose of the Study:

    • To compare accelerometry (ActiGraph GT3X) with manual step counts during a 6-minute walk test in ambulatory pediatric CMD.
    • To assess free-living physical activity intensity in children with CMD using accelerometry.
    • To determine the concurrent validity of accelerometry for step counting in this population.

    Main Methods:

    • Nine ambulatory pediatric CMD participants wore ActiGraph GT3X devices during a 6-minute walk test.
    • Manual step counts were performed concurrently to assess the validity of ActiGraph step counts.
    • Six participants underwent 7-day home-based accelerometry monitoring for activity intensity assessment.
    • Bland-Altman and correlation analyses were used, with validated cut-point values for neuromuscular disorders.

    Main Results:

    • ActiGraph GT3X significantly underestimated step counts compared to manual counts (411 vs. 699 steps, P = .004).
    • No concurrent validity was found between ActiGraph and manual step counts, even with low-frequency extension filters (Spearman ρ = 0.45, P = .22).
    • Home monitoring indicated participants spent over 80% of their time sedentary.

    Conclusions:

    • ActiGraph GT3X step counts lack concurrent validity with manual counts in pediatric CMD, potentially due to abnormal gait.
    • Further research using triaxial accelerometry is necessary to validate activity intensity measurements in CMD.
    • Accelerometry holds potential to complement the 6-minute walk test for assessing treatment efficacy in CMD.