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This Article Full Text Full Text (PDF) All Versions of this Article: 91/1/215    most recent expphysiol.2005.031971v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Hayashi, N. Articles by Fukuba, Y. Search for Related Content PubMed PubMed Citation Articles by Hayashi, N. Articles by Fukuba, Y. Related Collections Cardiovascular control

¹ Institute of Health Science² Graduate School of Human-Environment Studies, Kyushu University, Kasuga, Fukuoka 816-8580, Japan ³ Department of Exercise Science and Physiology, School of Health Sciences, Prefectural University of Hiroshima, Hiroshima 734-8558, Japan

The vascular responses to mental task in visceral arteries in humans have not been elucidated. We observed the responses in the renal (RA) and superior mesenteric (SMA) arteries to mental stress, using simultaneous pulsed and echo Doppler ultrasound flowmetry. Nine healthy females performed a computerized colour word conflict test (CWT) for 3 min. The mean blood velocity (MBV) in the right RA and SMA, heart rate (HR) and blood pressure were measured. The mean arterial pressure (MAP) was divided by the flow velocity to assess the vascular resistance (VR). The CWT significantly increased the MAP, HR and VR in both arteries from the first minute. During the CWT, flow in the RA decreased significantly at the third minute relative to baseline, while flow in the SMA showed no significant change from the first to the third minute. The degree of vasoconstriction in the RA bed was greater than that in the SMA bed. These results suggest that the mental task causes vasoconstriction in visceral arteries, and imply that it induces differential blood flow and vascular responses in visceral arteries.

(Received 15 August 2005; accepted after revision 19 October 2005; first published online 20 October 2005)
Corresponding author N. Hayashi: Institute of Health Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan. Email: naohayashi{at}ihs.kyushu-u.ac.jp

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