Blood flow velocity profiles in the middle cerebral artery during cycle exercise and physical work.

2014 Fiscal Year Final Research Report

• Project/Area Number: 24500479
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fusional brain recording science
• Research Institution: Kanagawa Institute of Technology
• Principal Investigator: MATSUO Takashi 神奈川工科大学, 創造工学部, 教授 (00165771)
• Co-Investigator(Renkei-kenkyūsha): WATANABE Shin-ichi 神奈川工科大学, 創造工学部, 准教授 (30333157)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 脳血流 / 中大脳動脈 / 超音波ドップラ / 運動負荷 / 姿勢変換

Outline of Final Research Achievements

The blood flow velocity waveforms in the middle cerebral artery (MCA) were measured under incremental cycle exercises and following recovery using the transcranial Doppler ultrasound velocimeter. At rest, the flow waveform in the MCA is characterized by a high forward flow at end-diastole, which is as much as half peak-systolic velocity. The peak-systolic velocity Vs was found to markedly rise in proportion with exercise intensity under mild and moderate intensities (up to 110 Watt) of exercise, while they tended to keep constant values under higher exercise intensities (above 110 W). The end-diastolic velocities Vd showed no significant change under mild exercise intensity and gradually increased under moderate exercise intensities. It was also found that the Vd values decrease more rapidly than Vs in recovery phase. Such nonlinear changes of Vs and Vd indicate that the influence of exercise on cerebral blood flow is more complicated than thought before.

Free Research Field

人間医工学