Characteristics of heat-induced hyperventilation and cerebral hypoperfusion in humans

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K16561
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Sports science
• Research Institution: Prefectural University of Hiroshima
• Principal Investigator: Tsuji Bun 県立広島大学, 総合教育センター, 講師 (40707212)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 高体温 / 過換気 / 熱中症 / 脳虚血

Outline of Final Research Achievements

Hyperthermia during exercise leads to increases in minute ventilation independently of metabolic factors, resulting in hypocapnia and cerebral hypoperfusion. This study examined the effect of time of day on respiratory and cerebrovascular responses during prolonged exercise in the heat. We showed that ventilation, estimated arterial CO2 pressure and middle cerebral artery blood velocity during prolonged exercise in the heat did not differ between morning and evening. These results suggest that time of day has no effect on the time course of hyperventilation, PaCO2 and cerebral blood flow response during prolonged exercise in the heat.

Free Research Field

運動生理学