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Functional Muscle Synergies Constrain Force Production During Postural Tasks by J. Lucas McKay; Lena H. Ting is a Medicine article available to read on EtoBox.

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We recently demonstrated that a set of five functional muscle synergies were sufficient to characterize both hindlimb muscle activity and active forces during automatic postural responses in cats standing at multiple postural configurations. This characterization depended critically upon the assumption that the endpoint force vector (synergy force vector) produced by the activation of each muscle synergy rotated with the limb axis as the hindlimb posture varied in the sagittal plane. Here, we used a detailed, 3D static model of the hindlimb to confirm that this assumption is biomechanically plausible: as we varied the model posture, simulated synergy force vectors rotated monotonically with the limb axis in the parasagittal plane (r 2 1⁄4 0.9470.08). We then tested whether a neural strategy of using these five functional muscle synergies provides the same force-generating capability as controlling each of the 31 muscles individually. We compared feasible force sets (FFSs) from the model with and without a muscle synergy organization. FFS volumes were significantly reduced with the muscle synergy organization (F 1⁄4 1556.01, p50.01), and as posture varied, the synergy-limited FFSs c

Who reads Functional Muscle Synergies Constrain Force Production During Postural Tasks?

Author

J. Lucas McKay; Lena H. Ting

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0021-9290)

Published

2008

Language

EN

Field

Medicine (Health Sciences)