抄録
The purpose of this study was to measure blood flow velocities in common carotid, brachial and femoral arteries simultaneously during head-up-tilt (HUT) using our developed telemetry measurement system. This system was implemented with simultaneous measurement of electrocardiogram (ECG). The velocity waveforms of 3 arteries, heart rate (HR), and blood pressure (BP) were assessed for 20 s at the stages of postural change. As a result, HUT-induced increase in HR was more pronounced in the young subjects. There was significant increase in diastolic BP, but a non significant change in systolic BP to tilt. The decreased of the blood flow index in the carotid artery was expected to be the effect of cerebral autoregulation (CA) to control blood flow to the brain. In conclusion, HUT produced larger changes in the 3 arteries, particularly in brachial and femoral, and also in HR and diastolic BP. This study demonstrated that simultaneous measurement of blood flow velocity waveforms in carotid, brachial, and femoral in HUT postural change using our telemetry measurement device was attainable. [J Physiol Sci. 2007;57 Suppl:S208]
