Does the increase in blood carbon dioxide concentration induced by vocalization during exercise reduce oxidative stress?

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K19992
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 59020:Sports sciences-related
• Research Institution: Chubu Gakuin University
• Principal Investigator: Arikawa Hajime 中部学院大学, スポーツ健康科学部, 教授 (10582174)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 運動 / 発声 / 血中二酸化炭素濃度 / 酸素飽和度 / 筋酸素状態 / 酸化ストレス

Outline of Final Research Achievements

During high-intensity exercise accompanied by vocalization, we observed reduced ventilation volume secondary to forced changes in respiratory patterns, increased blood carbon dioxide concentration, and tendency suppressed decline oxygen saturation of active muscles. However, oxidative stress remained unchanged. During the subsequent recovery period of no vocalization, we observed that the decrease in ventilation volume was slightly reduced at the early stage; however, it did not significantly affect other indicators including oxygen saturation of active muscles. These changes were specifically observed in “those who were accustomed to performing exercises with vocalization” during high-intensity exercise and did not occur during medium-intensity exercise or in “those unaccustomed to vocalization.”

Free Research Field

スポーツ科学

Academic Significance and Societal Importance of the Research Achievements

「発声を伴う運動」によって活動筋への酸素供給量を意図的に増加させる可能性が推察されたが，発声に伴う「呼吸困難感」が生じるため長時間運動には適さないと考えられる。したがって，短時間運動にのみ適用するか，運動実施期間中の一部に適用することが現実的だと考えられる。一方で，剣道や空手道のように頻繁に発声を繰り返す運動種目では，活動筋への酸素供給量増加を活用したトレーニングが考案できる可能性がある。