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最終更新日：2026/07/17
中村 真理子
ナカムラ マリコ
(Mariko Nakamura)
論文
- タイトル
- タイトル（英）
- Effectiveness of high-concentration CO2 hot water immersion in conditioning for athletes.
- 参照URL
- https://researchmap.jp/read0078635/published_papers/54404494
- 著者
- 著者（英）
- Shinsuke Tamai,Mariko Nakamura,Saeko Takahashi,Risa Iwata,Kazuya Fukami,Rie Shoji,Taiki Kodesho,Junpei Sasadai,Reia Shimizu,Kohei Nakajima
- 担当区分
- 概要
- 概要（英）
- Water immersion is a popular conditioning method; specifically, high-concentration CO2 hot water immersion (CO2-HWI) has become more common in recent years. This study aimed to investigate the effectiveness of CO2-HWI in conditioning for athletes from both physiological and biochemical perspectives. Ten male university baseball players participated in this randomized crossover trial. Each participant completed three 15-min interventions after team training sessions on separate experimental days: CO2-HWI (CO2; water temperature, 40 °C; CO2 concentration, 1000 ppm), tap HWI (TAP; water temperature, 40 °C), and non-water immersion (NON; room temperature, 25 °C; relative humidity 60%). Measurements were taken before and after the intervention, and change scores were calculated. Differences in change scores among the three conditions were analyzed using the Friedman test. From a physiological perspective, systolic blood pressure showed a significant decrease in the CO2 vs. NON comparison (p < 0.05), whereas most measures (e.g., core and skin temperatures) showed similar changes in the CO2 and TAP conditions compared with the NON condition (p < 0.05). From a biochemical perspective, salivary cortisol and secretory immunoglobulin A levels did not show significant changes. Meanwhile, salivary human herpesvirus (HHV-) 7 DNA levels showed a significant decrease in the CO2 vs. NON comparison (p < 0.05), while changes in HHV-6 DNA levels were not statistically significant. In summary, CO2-HWI demonstrated comparable effectiveness to TAP-HWI from both physiological and biochemical perspectives. Among these findings, CO2-HWI may contribute to reductions in systolic blood pressure and salivary HHV-7 DNA levels.
- 出版者・発行元
- 出版者・発行元（英）
- 誌名
- 誌名（英）
- Scientific reports
- 巻
- 号
- 開始ページ
- 終了ページ
- 出版年月
- 2026年7月1日
- 査読の有無
- 査読有り
- 招待の有無
- 掲載種別
- 研究論文（学術雑誌）
- ISSN
- DOI URL
- https://doi.org/10.1038/s41598-026-58672-y
- 共同研究・競争的資金等の研究課題