- 著者
- 土橋 祥平 小山 康文 安藤 大輔 小山 勝弘
- 出版者
- 一般社団法人日本体力医学会
- 雑誌
- 体力科学 (ISSN:0039906X)
- 巻号頁・発行日
- vol.68, no.2, pp.125-132, 2019-04-01 (Released:2019-03-16)
- 参考文献数
- 28
- 被引用文献数
- 1
Recently, a standing desk is being installed as a behavior change strategy to reduce sitting time in the workplace. However, the standing posture has been suggested to decrease forehead oxygenated hemoglobin (oxy-Hb), which might impair task performances. Therefore, we examined whether prolonged standing impairs speed and accuracy of computer subtraction task associated with a decrease in forehead oxy-Hb. Nine healthy young males completed 4 × 15-min computer tasks under two conditions, i.e., sitting and standing. In the computer tasks, all subjects were required to subtract a two-digit number from a four digit number written on the paper and to input the answer to the answer colomn on the computer. Task performances were evaluated as the number of achievements and accuracy rate every 15 minutes. Moreover, oxy-Hb and deoxygenated-hemoglobin (deoxy-Hb) in the site of left forehead area and lower limb were monitored throughout the experimental period by near-infrared spectroscopy. Forehead oxy-Hb was significantly associated with the number of achievements during computer tasks (p < 0.001). In addition, forehead oxy-Hb and task performances did not differ between sitting and standing. The number of achievements of subtraction task under standing condition was significantly decreased as time proceeds. Our results demonstrate that prolonged standing might impair computer subtraction task performances irrespective of the change in forehead oxy-Hb.
1 0 0 0 成長期の運動不足は認知症発症リスクを高めるか?
本研究では、成長期、特に発達早期の運動不足が将来的な認知機能に悪影響を及ぼす可能性について検討を行い、その対抗策の基盤となる分子メカニズムの解明を目指す。初年度は、生活習慣病に起因した認知機能低下を想定し,2型糖尿病を誘導するモデルラットを対象に、通常飼育群、活動制限による運動不足群を設定し、成長期の運動不足が成年期以降の認知機能に影響するか否かについて、エピジェネティック制御機構の観点から解明する。2年目以降は、成長期の中でも最も脳の可塑性が活発な発達早期における運動不足経験がその後の認知機能の変化に及ぼす否かについて実験動物を用いて検討する。