第50回日本理学療法学術大会

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口述

英語 口述1

Neurological Sciences 1

2015年6月5日(金) 09:00 〜 10:00 第7会場 (ホールD5)

座長:Toshiaki Suzuki(関西医療大学保健医療学部)

[O-0014] Effects of voluntary control on center of pressure sway and coactivation of ankle muscles during dual task in individuals with stroke

Kozo Ueta1,2, Moe Kikuchi2, Ryo Sakamoto2, Toshiyuki Mitsuyoshi2, Yohei Okada1,3, Makoto Hiyamizu1,3, Koichi Mukai4, Sadaaki Yata5, Shu Morioka1,3 (1.畿央大学大学院健康科学研究科神経リハビリテーション学研究室, 2.星ヶ丘医療センターリハビリテーション部, 3.畿央大学ニューロリハビリテーション研究センター, 4.四條畷学園大学リハビリテーション学部, 5.星ヶ丘医療センターリハビリテーション科)

キーワード:Stroke, Dual task, Voluntary control

[Purpose]
In individuals with stroke, balance training under a dual task may help to regain balance automaticity(Geurts 2005). During a dual task, the coactivation of ankle muscles and center of pressure(COP)sway are thought to decrease by reducing voluntary control of postural control(Reynolds 2010, Nafati 2011). We investigated whether coactivation and COP sway decrease by voluntary control reduction when individuals with stroke performed a cognitive task during quiet standing.
[Methods]
Seventeen individuals with unilateral stroke(64.5 years;11 affected left limbs)were asked to perform a Control condition(they were instructed to stand as usual)and Dual condition(they performed a cognitive task while standing). Each condition(20 s)was performed twice. The root mean square of total COP and the mean velocity of COP of each limb were calculated. Electromyographic data(tibialis anterior and medial gastrocnemius muscles)were used to calculate the coactivation index(CI). After completing each trial, the subjects were asked to provide a Likert scale(LS)score of the degree of voluntary control on a 4-point scale(4=high voluntary control), and they were grouped into an increase or decrease(higher or lower LS score under the Dual compared to the Control condition, respectively)group. Each reduction difference value(Control-Dual condition)of the variables of the COP and CI was compared between both groups.
[Results]
The reduction difference value of the root mean square of total anteroposterior COP, the mean velocity of anteroposterior COP, and CI of the nonparetic side limb were significantly larger in the decrease group(9 subjects)compared to the increase group(8 subjects)
[Discussio
The results of this study suggest that reducing voluntary control during a dual task training could lead to a decrease in the coactivation, amplitude, and velocity of anteroposterior COP in individuals with stroke.