Sway-dependent changes in standing ankle stiffness caused by muscle thixotropy
نویسندگان
چکیده
منابع مشابه
Sway‐dependent changes in standing ankle stiffness caused by muscle thixotropy
KEY POINTS The passive stiffness of the calf muscles contributes to standing balance, although the properties of muscle tissue are highly labile. We investigated the effect of sway history upon intrinsic ankle stiffness and demonstrated reductions in stiffness of up to 43% during conditions of increased baseline sway. This sway dependence was most apparent when using low amplitude stiffness-mea...
متن کاملAnkle muscle stiffness alone cannot stabilize balance during quiet standing.
This communication addresses again the hypothesis that the stabilization of balance during quiet standing is achieved by the stiffness of ankle muscles without anticipatory active control. It is shown that a recently proposed method of estimating ankle stiffness directly from the analysis of the posturographic data is incorrect because it ignores the modulation of motoneuronal activity and gros...
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This research presents new data and reanalyzed information to refute the criticisms of our model of stiffness control during quiet standing. A re-review of their references to biomechanical research on muscle ankle stiffness confirmed muscle stiffness estimates of the ankle series elastic elements that agreed closely with our estimates. A new technique is presented that directly estimates the m...
متن کاملCan muscle stiffness alone stabilize upright standing?
A stiffness control model for the stabilization of sway has been proposed recently. This paper discusses two inadequacies of the model: modeling and empiric consistency. First, we show that the in-phase relation between the trajectories of the center of pressure and the center of mass is determined by physics, not by control patterns. Second, we show that physiological values of stiffness of th...
متن کاملContribution of thixotropy, spasticity, and contracture to ankle stiffness after stroke.
OBJECTIVES Increased resistance to stretch of muscles after stroke may be the result of centrally mediated neural factors such as spasticity or local, peripheral factors such as muscle contracture or thixotropy. The aim was to investigate evidence for an abnormal thixotropic response and compare this with two other factors-contracture and spasticity-which could potentially contribute to muscle ...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 2015
ISSN: 0022-3751
DOI: 10.1113/jp271137