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• W2023789434 abstract "Kinematic variability is caused, in part, by force fluctuations. It has been shown empirically and numerically that the effects of force fluctuations on kinematics can be suppressed by increasing joint impedance. Given that force variability increases with muscular fatigue, we hypothesized that joint impedance would increase with fatigue to retain a prescribed accuracy level. To test this hypothesis, subjects tracked a target by elbow flexion and extension both with fatigued and unfatigued elbow flexor and extensor muscles. Joint impedance was estimated from controlled perturbations to the elbow. Contrary to the hypothesis, elbow impedance decreased, whereas performance, expressed as the time-on-target, was unaffected by fatigue. Further analysis of the data revealed that subjects changed their control strategy with increasing fatigue. Although their overall kinematic variability increased, task performance was retained by staying closer to the center of the target when fatigued. In conclusion, the present study reveals a limitation of impedance modulation in the control of movement variability." @default.
• W2023789434 created "2016-06-24" @default.
• W2023789434 creator A5026183351 @default.
• W2023789434 creator A5036424119 @default.
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• W2023789434 date "2007-03-07" @default.
• W2023789434 modified "2023-09-27" @default.
• W2023789434 title "Fatigue-induced changes of impedance and performance in target tracking" @default.
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• W2023789434 doi "https://doi.org/10.1007/s00221-007-0909-0" @default.
• W2023789434 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1914220" @default.
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• W2023789434 hasPublicationYear "2007" @default.
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