TY - GEN
T1 - Intrinsic, reflex and voluntary contributions to task-dependent joint stiffness
AU - Ludvig, Daniel
AU - Kearney, Robert E.
PY - 2010
Y1 - 2010
N2 - Dynamic joint stiffness defines the dynamic relationship between the position of the joint and the torque acting about it. Joint stiffness consists of two components: intrinsic and reflex stiffness. Previous work from our lab has shown that subjects can alter their reflex stiffness voluntarily and independently of intrinsic stiffness. Numerous studies have investigated whether reflex stiffness is altered in a taskdependent fashion; however the results of these studies are inconclusive. We designed an experimental paradigm where subjects were faced with 3 tasks: one task where joint stiffness aided subjects, a second where joint stiffness hindered the subjects and a third where joint stiffness had no effect. We found that subjects did not alter their joint stiffness to perform the different tasks. Rather, they performed the tasks by voluntarily producing the appropriate torque based on visual feedback. Thus, with the paradigm used in this study, reflex stiffness was not modulated in a task-dependent manner.
AB - Dynamic joint stiffness defines the dynamic relationship between the position of the joint and the torque acting about it. Joint stiffness consists of two components: intrinsic and reflex stiffness. Previous work from our lab has shown that subjects can alter their reflex stiffness voluntarily and independently of intrinsic stiffness. Numerous studies have investigated whether reflex stiffness is altered in a taskdependent fashion; however the results of these studies are inconclusive. We designed an experimental paradigm where subjects were faced with 3 tasks: one task where joint stiffness aided subjects, a second where joint stiffness hindered the subjects and a third where joint stiffness had no effect. We found that subjects did not alter their joint stiffness to perform the different tasks. Rather, they performed the tasks by voluntarily producing the appropriate torque based on visual feedback. Thus, with the paradigm used in this study, reflex stiffness was not modulated in a task-dependent manner.
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U2 - 10.1109/IEMBS.2010.5627255
DO - 10.1109/IEMBS.2010.5627255
M3 - Conference contribution
C2 - 21096661
AN - SCOPUS:78650814908
SN - 9781424441235
T3 - 2010 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10
SP - 4914
EP - 4917
BT - 2010 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10
T2 - 2010 32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC'10
Y2 - 31 August 2010 through 4 September 2010
ER -