頚部前屈姿勢保持に伴う脳賦活作用の上肢および下肢筋循環動態に及ぼす影響

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  • 渡辺 一志
    大阪市立大学 都市健康・スポーツ研究センター
  • 藤原 勝夫
    金沢大学 医薬保健研究域 医学系 運動生体管理学
  • 国田 賢治
    札幌国際大学 スポーツ人間学部 スポーツ指導学科

書誌事項

タイトル別名
  • Effect of brain activation in circulatory dynamics of upper and lower extremity muscles during maintaining neck flexion
  • ケイブ ゼンクツシセイ ホジ ニ トモナウ ノウ フカツ サヨウ ノ ジョウシ オヨビ カシキン ジュンカン ドウタイ ニ オヨボス エイキョウ

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<p>  The present study investigated whether brain activation while maintaining neck flexion affects changes to circulatory dynamics in the upper and lower extremity muscles. We selected 15 healthy volunteers with a mean age of 20.6 years (range, 18-22 years). All had played some kind of sports from elementary school through university. Neck flexion angles were randomly set at 0° (neck resting) or 20° (neck flexion). Muscle oxygenated hemoglobin concentration (oxy-Hb) in right upper and lower extremity muscles was measured using near-infrared spectroscopy. Oxy-Hb and electromyogram (EMG) of biceps brachii (BB), triceps brachii (TB), tibialis anterior (TA) and gastrocnemius (GS) were measured. Skin blood flow (SBF) was measured over BB and TA. Heart rate (HR), blood pressure (BP) and cardiac output (CO) were measured during neck flexion. Muscle oxy-Hb in BB, TB and TA were significantly increased during neck flexion. This indicated that blood flow within those muscles was clearly increased while maintaining neck flexion. However, oxy-Hb in GS did not change with neck flexion. Significant correlations were found in the enhancement of blood flow during neck flexion between BB and TB (r = 0.83), BB and TA (r = 0.78), and TB and TA (r = 0.57). No significant effect of posture was found for HR, BP, CO, SBF or EMG. These findings indicate that the increase in muscle blood flow in upper and lower extremity muscles was elicited by brain activation during maintenance of neck flexion.</p>

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