Differences of physiological responses and training effects in two simulated altitudes -A comparative study of hypobaric hypoxic environment and normobaric hypoxic environment-

• Project/Area Number: 18700525
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Sports science
• Research Institution: National Agency for the Advancement of Sports and Health
• Principal Investigator: MAEGAWA Taketeru National Agency for the Advancement of Sports and Health, スポーツ科学研究部, 研究員 (50336351)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,680,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥180,000); Fiscal Year 2008: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2007: ¥1,200,000 (Direct Cost: ¥1,200,000); Fiscal Year 2006: ¥1,700,000 (Direct Cost: ¥1,700,000)
• Keywords: 低圧低酸素環境 / 常圧低酸素環境 / 高所トレーニング / 低酸素トレーニング / 動脈血酸素飽和度 / 自律神経応答 / 自律神経機能 / 自律神経活動

Research Abstract

酸素分圧が同じ低圧低酸素環境と常圧低酸素環境で,生理応答や運動トレーニングの効果に違いが生じるのかを検討した.
その結果,酸素分圧が同じでも気圧が異なると体内に取り込まれる酸素の量に差が生じた.トレーニングの効果では,有酸素的能力の改善に気圧の違いによる差はなかったが,無酸素的能力の改善は低圧低酸素環境でトレーニングを行った方がその改善の程度が大きかった.
常圧低酸素環境を利用して低圧低酸素環境(≒自然の高所)と同様の効果を得ようとすると,トレーニング期間の延長や酸素分圧を更に下げるなどの工夫が必要かもしれない.

Research Products

• [Journal Article] Differences in heart rate variability during exercise between hypobaric and normobaric hypoxia (2008)
  • Author(s): Taketeru Maegawa, Emi Hashimoto, Katsuyuki Kondo, Takayuki Sugo
  • Journal Title: Wilderness Environ. Med. 18(3) Pages: 245-246
• [Journal Article] Differences in heart rate variability during exercise between hypobaric and normobaric hypoxia (2007)
  • Author(s): Maegawa, T., E. Hashimoto, K. Kondo, T. Sugo
  • Journal Title: Wilderness and Environmental Medicine 18 Pages: 245-246
• [Presentation] Effect of acute normobaric hypoxia on stroke volume and cardiac output response during exercise (2008)
  • Author(s): Taira Fukuda, Taketeru Maegawa, Akihiro Matsumoto, Toshiaki Nakajima, Ryozo Nagai, Yutaka Komatsu, Takashi Kawahara
  • Organizer: The 12th international symposium on altitude training 2008 Tokyo
  • Place of Presentation: Tokyo
  • Year and Date: 2008-10-26
• [Presentation] 肺動脈圧からみた高地トレーニングの至適高度について (2008)
  • Author(s): 前川剛輝, 斉藤陽子 平島美樹 長谷川絢子 川原貴
  • Organizer: 第21回日本トレーニング科学会大会
  • Place of Presentation: 埼玉
• [Presentation] Differences in heart rate variability during exercise between hypobaric and normobaric hypoxia (2007)
  • Author(s): Maegawa, T., E. Hashimoto, K. Kondo, T. Sugo
  • Organizer: Mountain & Wilderness Medicine World Congress2007
  • Place of Presentation: Aviemore,Scotland
  • Year and Date: 2007-10-05
• [Presentation] Differences in heart rate variability during exercise between hypobaric and normobaric hypoxia (2007)
  • Author(s): Taketeru Maegawa, Emi Hashimoto, Katsuyuki Kondo, Takayuki Sugo
  • Organizer: Mountain & Wilderness Medicine World Congress 2007
  • Place of Presentation: Aviemore, Scotland