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Influence of limb configurations and stimulation parameters on knee and ankle joint torque generation


T. Keller, M. Lawrence, Susanne Wydenkeller, Martin Wieser

International Functional Electrical Stimulation Society Conference, Montreal, Canada, vol. 10, pp. 291-294

An important question in lower extremity functional electrical stimulation (FES) applications is how much does the muscular-skeletal system modulate the joint torque generation and how much has to be performed by the neuronal system to generate a normal walking pattern. In the presented study we quantified the influence of five limb configurations occurring at 7%, 45%, 65%, 75%, and 98% of the stride on the ankle and knee joint torque generation. Transcutaneous electrical stimulation was used to generate the same level of neuronal activation in the ankle and knee joint actuators for each configuration and isometric ankle and knee joint torques were measured. The results from nine healthy subjects showed that the limb configuration had a strong influence on the generated joint torques. Inter subject variations were surprisingly low. The hamstrings and gastrocnemius muscles produced high joint torques for a given electrical stimulation intensity at stride positions where the EMG activity is high during the gait cycle. This suggests that the neuronal effort is supported by the muscular-skeletal system for these muscles. For limb configurations that represent early stance phase the quadriceps and tibialis anterior muscles did not produce high joint torques as could be estimated from EMG activity.


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% Autogenerated BibTeX entry
@InProceedings { KelEtal:2005:IFA_2220,
    author={T. Keller and M. Lawrence and Susanne Wydenkeller and Martin Wieser},
    title={{Influence of limb configurations and stimulation parameters
	  on knee and ankle joint torque generation}},
    booktitle={International Functional Electrical Stimulation Society
    address={Montreal, Canada},
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