The effects of limb load on muscle activity during isolated reflex testing and walking post-stroke Public Deposited

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Last Modified
  • March 21, 2019
Creator
  • Hardee, Amy W.
    • Affiliation: School of Medicine, UNC/NCSU Joint Department of Biomedical Engineering
Abstract
  • Gait impairments are common after stroke, and are most often characterized by difficulty flexing the leg during swing phase. Limb load, or the weight born through the leg, can influence extensor muscle excitability and may be responsible for this `stiff-legged gait pattern'. We hypothesized that there would be a direct relationship between limb load mediated knee extensor excitability during an isolated setting and during late stance/early swing of gait. Nine subjects had electromyography and kinematics recorded during walking with 0, 20, and 40% body weight support. I also collected quadriceps reflex excitability with and without an imposed limb load in an isolated setting. No significant relationship was observed between limb load and quadriceps muscle activity during reflex testing or walking. Limb load did not influence quadriceps activity suggesting that limb load sensors, which are believed to reside in the plantarflexor muscles, may act locally rather than globally throughout the limb.
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  • In Copyright
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  • "... in partial fulfillment of the requirements of the degree of Masters of Science in the Department of Biomedical Engineering."
Advisor
  • Goldberg, Richard
  • Lewek, Michael
Degree granting institution
  • University of North Carolina at Chapel Hill
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Place of publication
  • Chapel Hill, NC
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  • Open access
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