<Originals>Effects of a Load Added to the Moving Joint on Anticipatory Postural Adijustment Induced by Ballistic Arm Movement in Standing Humans

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概要

• 論文の詳細を見る

• Shimura, K., Sasaki, H. and Kasai, T., Effects of a Load Added to Moving Joint on Anticipatory Postural Adjustment Induced by Ballistic Arm Movement in Standing Humans.Abv. Exerc. Sports Physiol., Vol.10, No.1 pp.25-30, 2004. The aim of the present study is to investigate flexible neurophysilogical mechanisms of anticipatory postural adjustment (APA) during ballistic arm movement in standing human subjects. To reveal the mechanisms, we recorded EMG discharges of postural muscles and the soleous H-reflexes (Sol-H) before, during and after ballistic arm movement with or without a load (loaded or unloaded) to the moving wrist joint. The present results were as follows; 1) Preceding EMG durations of the ipsilaterak biceps femoris (BFi) muscle at the unloaded were significantly longer than those at the loaded, whereas three other time phases (EMG duration of BFi, tome difference between EMG onset of left and right BF muscles, and duration of soleus EMG silence) at the loaded were always longer than those at the unloaded, 2) Excitability changes of Sol-H on the time curse at the loaded or the unloaded were dependent upon EMG discharge patterns of the soleus muscke i.e., depression of Sol-H at the unloaded was langer than that at the loaded, but duration of Sol-H depression on the time course was longer at the loaded than that at the unloaded, and 3) Movement initiation of the ipsilateral knee joint at the unloaded was earlier and larger than that at the loaded. These results confirmed the previous suggestion, i.e., the mechanism of APA is a flexible. In addition, to be more concrete, these results lead to the conclusion that the regulation of the stretch reflex threshold and the muscle stiffness are essential ncural mechanisms of APA.

• 日本運動生理学会の論文

著者

• SHIMURA Kuniyoshi

  Department of Health Science Unit, Kitasato University

• KASAI Tatsuya

  Division of Sports and Health Sciences, Graduate School for International Development and Cooperatio

• Kasai Tatsuya

  Division Of Sports & Health Sciences Graduate School For International Development And Coop-erat

• Sasaki Hisato

  Department Of Physical Therapy Faculty Of Health Science Kio University

• Shimura Kuniyoshi

  Department Of Health Science Unit Kitasato University

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