Development of a body cooling method using carbonated water

• Project/Area Number: 18K10917
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 59020:Sports sciences-related
• Research Institution: University of Shizuoka,Shizuoka College
• Principal Investigator: Hayashi Keiji 静岡県立大学短期大学部, 短期大学部, 教授 (00431677)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 体温 / 皮膚血管拡張 / 熱中症 / 二酸化炭素 / 冷却効果 / 冷却効率 / 快適感覚 / 温熱感覚

Outline of Final Research Achievements

In this research project, we investigated whether a low-temperature carbonated water can effectively, comfortably, and safely cool the body. As a result, it was found that when the water temperature was 30°C and the concentration was 1000 ppm, the cooling effect was about 1.7 times higher than that of tap water, and the discomfort sensation was also reduced. However, when the water temperature was lowered or the concentration was lowered, the cooling effect became the same level as that of tap water or the effect of reducing discomfort was no longer observed. These results suggest that it is necessary to adjust the conditions of water temperature and concentration when body cooling is used.

Academic Significance and Societal Importance of the Research Achievements

通常、炭酸泉は温浴効果を高めることを目的として使用される。これを、冷却効果を高めること、そして冷却時の不快感軽減を目的として使用する点で独創的な研究である。研究の結果、低温で高濃度の炭酸泉に浸漬することで、水道水に浸漬するよりも早く体温を低下させることができ、さらには不快感も軽減できることが示された。このことは、炭酸泉を用いた身体冷却の方法は、水道水を用いるよりも効果的であり、冷却を施される側の負担軽減にもつながることを示しており、新しい身体冷却方法として提案できるものと期待できる。

Research Products

• [Journal Article] A novel cooling method using carbon dioxide-rich water after passive heating (2021)
  • Author(s): Hayashi Keiji
  • Journal Title: Journal of Thermal Biology Volume: 96 Pages: 102843-102843
  • DOI: 10.1016/j.jtherbio.2021.102843
  • Peer Reviewed / Open Access
• [Journal Article] Effect of food intake on respiratory chemosensitivity to CO2 in young adults (2019)
  • Author(s): Hayashi Keiji、Suekuni Misato、Sugiyama Koji
  • Journal Title: Journal of Physiological Anthropology Volume: 38 Issue: 1
  • DOI: 10.1186/s40101-019-0200-7
  • Peer Reviewed / Open Access
• [Journal Article] Effect of food intake on the ventilatory response to increasing core temperature during exercise (2019)
  • Author(s): Hayashi Keiji、Ito Nozomi、Ichikawa Yoko、Suzuki Yuichi
  • Journal Title: Applied Physiology, Nutrition, and Metabolism Volume: 44 Issue: 1 Pages: 22-30
  • DOI: 10.1139/apnm-2018-0069
  • Peer Reviewed
• [Presentation] 低濃度炭酸泉による冷却効果の検討 (2020)
  • Author(s): 林 恵嗣
  • Organizer: 第75回日本体力医学会大会
• [Presentation] 環境温が低酸素下でのスプリント運動パフォーマンスに及ぼす影響 (2020)
  • Author(s): 小川 剛司，嶋原 耕平，林 恵嗣，若林 斉，西保 岳
  • Organizer: 第75回日本体力医学会大会
• [Presentation] 低温炭酸泉による冷却効果の検討 (2019)
  • Author(s): 林 恵嗣
  • Organizer: 第74回日本体力医学会大会
• [Presentation] Relationship between respiratory chemosensitivity and hyperthermia-induced hyperventilation (2019)
  • Author(s): Keiji Hayashi, Takuya Kanada, Koji Sugiyama
  • Organizer: The 18th International Conference on Environmental Ergonomics
  • Int'l Joint Research
• [Presentation] 運動時の体温上昇が呼吸化学感受性に及ぼす影響 (2018)
  • Author(s): 林 恵嗣，金田 拓也，杉山 康司
  • Organizer: 第73回日本体力医学会大会
• [Book] 運動生理学 (2019)
  • Author(s): 麻見 直美、川中 健太郎
  • Total Pages: 200
  • Publisher: 羊土社
  • ISBN: 9784758113564
• [Book] 運動生理学（麻見 直美、川中 健太郎 編集） (2019)
  • Author(s): 林 恵嗣
  • Total Pages: 200
  • Publisher: 羊土社
  • ISBN: 9784758113564