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Merging of healthy motor modules predicts reduced locomotor performance and muscle coordination complexity post-stroke.
- D. Clark, L. Ting, F. Zajac, R. Neptune, S. Kautz
- Biology, PsychologyJournal of Neurophysiology
- 1 February 2010
A common modular organization of muscle coordination underlying walking in both healthy and post-stroke subjects is suggested, which may lead to new insight into impaired locomotor coordination and the underlying neural systems.
Muscle synergy organization is robust across a variety of postural perturbations.
The robustness of synergy organization across perturbation types, postures, and animals suggests that muscle synergies controlling task-variables are a general construct used by the CNS for balance control.
A limited set of muscle synergies for force control during a postural task.
It is suggested that, within the context of active balance control, postural synergies reflect a neural command signal that specifies endpoint force of a limb.
Muscle synergies characterizing human postural responses.
The results suggest that muscle synergies represent a general neural strategy underlying muscle coordination in postural tasks that represents variations in the amplitude of descending neural commands that activate individual Muscle synergies.
Leg design in hexapedal runners.
To explain how diverse leg designs can result in common whole-body dynamics, a miniature force platform was used to measure the ground reaction forces produced by individual legs of the cockroach Blaberus discoidalis and showed that deviations from the minimum moments may be explained by considering the minimization of the summed muscle forces in more than one leg.
Neuromechanics of muscle synergies for posture and movement
Dynamic and static stability in hexapedal runners.
Running cockroaches met the criteria for static stability over a wide range of speeds, yet several locomotor variables changed in a way that revealed an increase in the importance of dynamic stability as speed increased, indicating instances of static instability at fast speeds.
Dimensional reduction in sensorimotor systems: a framework for understanding muscle coordination of posture.
- L. Ting
- Biology, PsychologyProgress in Brain Research
Subject-specific muscle synergies in human balance control are consistent across different biomechanical contexts.
It is shown that trial-by-trial variations in muscle activation for multidirectional balance control in humans were constrained by a small set of muscle synergies, and Muscle synergies represent consistent motor modules that map intention to action, regardless of the biomechanical context of the task.