Autoregulation in the ocular and cerebral arteries during the cold pressor test and handgrip exercise

Tsukasa Ikemura, Nami Someya, Naoyuki Hayashi*

*この研究の対応する著者

研究成果: Article査読

15 被引用数 (Scopus)

抄録

The aim of this study was to determine whether autoregulation exerts similar effects in the ocular and cerebral vessels, which are both branches of the internal carotid artery. Ocular blood flow velocities, cerebral blood flow velocity and blood pressure were measured in 11 subjects during a 2-min resting period, static handgrip exercise (HG) and a cold pressor test (CPT). Blood velocity data for the superior and inferior temporal retinal arterioles (STRA and ITRA, respectively) and the retinal and choroidal vasculature (RCV) were obtained for 4 s during the measurement using laser speckle flowmetry. Mean blood flow velocity in the middle cerebral artery (MCAVmean) was measured by transcranial Doppler ultrasound. The conductance index (CI) of each vessel was calculated by dividing blood flow by mean arterial pressure. Blood flow velocity in the RCV increased by 19 ± 9% from resting baseline level during the CPT (P <0.05), while blood flow in the STRA, ITRA and MCAVmean did not. The CI of the MCA decreased. The RCV blood flow velocity, ITRA blood flow and MCAVmean increased by 8 ± 1, 9 ± 3 and 11 ± 4%, respectively, during the HG (P <0.05). Conversely, STRA blood flow remained unchanged. The HG did not significantly change the CI in any of the vessels measured. These findings suggest that cerebral blood flow velocity was maintained during the CPT, but autoregulation does not work well in the RCV during the CPT and HG.

本文言語English
ページ(範囲)641-646
ページ数6
ジャーナルEuropean Journal of Applied Physiology
112
2
DOI
出版ステータスPublished - 2012 2月
外部発表はい

ASJC Scopus subject areas

  • 公衆衛生学、環境および労働衛生
  • 整形外科およびスポーツ医学
  • 生理学(医学)

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