Postural fluctuations during pointing from a unilateral or bilateral stance

Ing Shiou Hwang, Chien Ting Huang, Rong Ju Cherng, Chien Chun Huang

研究成果: Article同行評審

38 引文 斯高帕斯(Scopus)


An experiment was conducted to compare the effects of bilateral and unilateral stance on postural fluctuations and intralimb coordination during active balance control. Fifteen participants stood bilaterally and unilaterally while conducting a pointing task with an outstretched arm. Excursion of center of foot pressure (CoP) and limb movements were recorded with a force plate and eight dual-axis accelerometers, respectively. Compared to bilateral stance, unilateral stance resulted in wider CoP trajectories and greater postural fluctuations, especially in the lower limbs. The limb-dependent postural fluctuations during unilateral stance were associated with an increased coupling between the upper limb segments and a decreased coupling between the segments of the stance leg. Unilateral stance further resulted in greater regularity and spectral changes in postural fluctuations of the trunk and lower limb due to increased central oscillations (8-15 Hz). The observed structural differences in postural fluctuations between unilateral and bilateral stance strongly suggested that the postural control system modulates joint stiffness in a stance-dependent manner. Probably, in unilateral stance, attentive control was shifted to the stance leg at the expense of increasing arm stiffness to reduce movement redundancy.

頁(從 - 到)275-291
期刊Human Movement Science
出版狀態Published - 2006 4月

All Science Journal Classification (ASJC) codes

  • 生物物理學
  • 骨科和運動醫學
  • 實驗與認知心理學


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