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Related Experiment Videos

Using isokinetic dynamometry to test ambulatory patients with multiple sclerosis.

L E Armstrong, D M Winant, P R Swasey

    Physical Therapy
    |August 1, 1983
    PubMed
    Summary

    Isokinetic dynamometry is a safe and reliable method for assessing muscle strength in ambulatory patients with multiple sclerosis (MS). This objective neuromuscular testing revealed lower peak torque in MS patients but comparable muscle strength ratios compared to healthy individuals.

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    Area of Science:

    • Neurology
    • Rehabilitation Medicine
    • Biomedical Engineering

    Background:

    • Multiple sclerosis (MS) is a chronic neurological disease affecting muscle function.
    • Objective assessment of neuromuscular function in ambulatory MS patients is crucial for rehabilitation and monitoring.
    • Isokinetic dynamometry offers a standardized method for evaluating muscle strength and endurance.

    Purpose of the Study:

    • To evaluate the safety and appropriateness of isokinetic dynamometry for ambulatory individuals with MS.
    • To characterize the specific testing idiosyncrasies observed in MS patients during isokinetic assessments.
    • To compare muscle strength and endurance parameters between MS patients and healthy controls.

    Main Methods:

    • Ten ambulatory patients with MS and 20 age-, sex-, and weight-matched healthy subjects participated.

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  • Isokinetic peak torque and endurance of knee extensors and flexors were measured at various angular velocities (0-275 degrees/sec).
  • Extensor:flexor muscle strength ratios were calculated, and chart recordings analyzed for contractile difficulties.

    • Main Results:

    • Patients with MS exhibited significantly lower peak torque for knee extensor and flexor muscles across all velocities (p < .001).
    • Muscle strength and endurance patterns, in terms of shape and slope, were similar between MS patients and controls.
    • Mean extensor:flexor strength ratios were not significantly different between groups at 70, 190, and 230 degrees/sec.

    Conclusions:

    • Isokinetic dynamometry is deemed a safe and reliable tool for objective neuromuscular evaluation in ambulatory MS patients.
    • Despite reduced peak torque, MS patients demonstrate comparable relative muscle strength ratios, indicating potential for targeted rehabilitation.
    • The findings support the use of isokinetic testing to quantify strength deficits and monitor treatment efficacy in MS.