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Muscle Stimulation Frequency01:22

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Wave summation
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Tremor Frequency Assessment by iPhone® Applications: Correlation with EMG Analysis.

Rui Araújo, Miguel Tábuas-Pereira, Luciano Almendra

    Journal of Parkinson'S Disease
    |September 24, 2016
    PubMed
    Summary

    Smartphone apps like LiftPulse, iSeismometer, and Studymytremor reliably measure tremor frequency. These apps offer a valid alternative to traditional electromyography (EMG) for assessing tremors in Parkinson

    Keywords:
    EMGTremoraccelerometersfrequencyiPhonesmartphones

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    Area of Science:

    • Neurology
    • Biomedical Engineering
    • Medical Technology

    Background:

    • Electromyography (EMG) is the standard for tremor frequency analysis.
    • Accelerometers are emerging as a viable alternative for tremor assessment.
    • Smartphone accelerometers offer potential for accessible tremor measurement.

    Purpose of the Study:

    • To evaluate the reliability of iPhone applications for tremor frequency analysis.
    • To compare smartphone app measurements with traditional EMG and dedicated accelerometry.
    • To determine if mobile apps can serve as a practical alternative for tremor assessment.

    Main Methods:

    • Twenty-two patients diagnosed with Parkinson's disease (PD), essential tremor (ET), and Holmes' tremor participated.
    • Tremor frequency was simultaneously measured using three iPhone applications, EMG needle assessment, and a dedicated accelerometer.
    • Pearson correlation coefficients were calculated to assess the agreement between methods.

    Main Results:

    • A very strong positive correlation (Pearson >0.8, p < 0.001) was observed between all three tested applications and both EMG and dedicated accelerometry.
    • The applications LiftPulse®, iSeismometer®, and Studymytremor® demonstrated high consistency in measuring tremor frequency.
    • Results indicate excellent agreement across different tremor types (PD, ET, Holmes').

    Conclusions:

    • The tested smartphone applications (LiftPulse®, iSeismometer®, Studymytremor®) are reliable tools for tremor frequency assessment.
    • These mobile applications provide a valid and accessible alternative to conventional EMG methods.
    • Widespread adoption of these apps could improve remote tremor monitoring and patient self-management.