Postural Sway and Muscle Activity Dynamics of Upright Standing on Sloped Surfaces

被引:1
|
作者
Baldridge, Jacey [1 ]
King, Adam C. [1 ]
机构
[1] Texas Christian Univ, Dept Kinesiol, Ft Worth, TX 76129 USA
关键词
  postural control; co; -contraction; dynamic coupling; nonlinear analysis; PHYSIOLOGICAL COMPLEXITY; ANKLE STIFFNESS; BALANCE TASKS; OLDER-ADULTS; YOUNG; ACTIVATION; STABILITY; ANTERIOR; COCONTRACTION; COACTIVATION;
D O I
10.1123/mc.2022-0005
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
During upright standing, individuals often use co-contraction muscle activity at the ankle joint when encountering increased postural difficulty; however, this strategy has been shown to be maladaptive. The purpose of the current investigation was to examine the effect of sloped standing on postural sway and muscle cocontraction at the ankle joint as a function of postural difficulty. Twelve young (21.67 +/- 1.11 years) adults performed upright standing on flat, declined, and inclined support surfaces. Center of pressure displacements indexed postural sway while electromyography data were collected for the tibialis anterior and gastrocnemius medialis muscles. A co-contraction index and a nonlinear coupling metric (cross-approximate entropy) were computed between ankle dorsiflexor and plantar flexor muscles (tibialis anterior/gastrocnemius medialis) activity. The results showed that higher degrees of postural difficulty led to increased amounts of sway as well as increased sway regularity. Lower co-contraction index was observed for higher degrees of postural difficulty; however, increased dynamic coupling occurred with deviations from the flat standing condition. Overall, increased postural difficulty as manipulated by sloped standing (in either inclined or declined conditions) resulted in individuals adopting a more regular sway trajectory that may be due, in part, to a stronger dynamic coupling strategy occurring at the neuromuscular level.
引用
收藏
页码:591 / 607
页数:17
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