Abstract
Coordinated movement requires that the neuromuscular system account and compensate for movement dynamics. One particularly complex aspect of movement dynamics is the interaction that occurs between degrees of freedom (DOF), which may be caused by inertia, damping, and/or stiffness. During wrist rotations, the two DOF of the wrist (flexion–extension and radial–ulnar deviation, FE and RUD) are coupled through interaction torques arising from passive joint stiffness. One important unanswered question is whether the DOF of the forearm (pronation–supination, PS) is coupled to the two DOF of the wrist. Answering this question, and understanding the dynamics of wrist and forearm rotations in general, requires knowledge of the stiffness encountered during rotations involving all three DOF (PS, FE, and RUD). Here we present the first-ever measurement of the passive stiffness encountered during simultaneous wrist and forearm rotations. Using a wrist and forearm robot, we measured coupled wrist and forearm stiffness in 10 subjects and present it as a 3-by-3 stiffness matrix. This measurement of passive wrist and forearm stiffness will enable future studies investigating the dynamics of wrist and forearm rotations, exposing the dynamics for which the neuromuscular system must plan and compensate during movements involving the wrist and forearm.
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Abbreviations
- DOF:
-
Degree(s) of freedom
- sEMG:
-
Surface electromyogram
- FE:
-
Flexion–extension of the wrist
- MVC:
-
Maximum voluntary contraction
- PS:
-
Pronation–supination of the forearm
- RUD:
-
Radial–ulnar deviation of the wrist
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We’d like to thank Dr. Dennis Eggett (BYU Statistical Consulting Center) for technical assistance with the statistical analysis.
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Associate Editor Michael R. Torry oversaw the review of this article.
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Drake, W.B., Charles, S.K. Passive Stiffness of Coupled Wrist and Forearm Rotations. Ann Biomed Eng 42, 1853–1866 (2014). https://doi.org/10.1007/s10439-014-1054-0
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DOI: https://doi.org/10.1007/s10439-014-1054-0