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• W2155192562 endingPage "2091" @default.
• W2155192562 startingPage "2083" @default.
• W2155192562 abstract "Although many daily tasks tend to destabilize arm posture, it is still possible to have stable interactions with the environment by regulating the multijoint mechanics of the arm in a task-appropriate manner. For postural tasks, this regulation involves the appropriate control of endpoint stiffness, which represents the stiffness of the arm at the hand. Although experimental studies have been used to evaluate endpoint stiffness control, including the orientation of maximal stiffness, the underlying neural strategies remain unknown. Specifically, the relative importance of feedforward and feedback mechanisms has yet to be determined due to the difficulty separately identifying the contributions of these mechanisms in human experiments. This study used a previously validated three-dimensional musculoskeletal model of the arm to quantify the degree to which the orientation of maximal endpoint stiffness could be changed using only steady-state muscle activations, used to represent feedforward motor commands. Our hypothesis was that the feedforward control of endpoint stiffness orientation would be significantly constrained by the biomechanical properties of the musculoskeletal system. Our results supported this hypothesis, demonstrating substantial biomechanical constraints on the ability to regulate endpoint stiffness throughout the workspace. The ability to regulate stiffness orientation was further constrained by additional task requirements, such as the need to support the arm against gravity or exert forces on the environment. Together, these results bound the degree to which slowly varying feedforward motor commands can be used to regulate the orientation of maximum arm stiffness and provide a context for better understanding conditions in which feedback control may be needed." @default.
• W2155192562 created "2016-06-24" @default.
• W2155192562 creator A5022509823 @default.
• W2155192562 creator A5074706123 @default.
• W2155192562 creator A5091823591 @default.
• W2155192562 date "2012-10-15" @default.
• W2155192562 modified "2023-09-23" @default.
• W2155192562 title "Biomechanical constraints on the feedforward regulation of endpoint stiffness" @default.
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• W2155192562 doi "https://doi.org/10.1152/jn.00330.2012" @default.
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