Rehrer N J, Smets A, Reynaert H, Goes E, De Meirleir K
Department of Sports Medicine and Human Physiology, Academic Hospital, Free University of Brussels, Brussels, Belgium.
Med Sci Sports Exerc. 2001 Sep;33(9):1533-7. doi: 10.1097/00005768-200109000-00017.
Doppler pulsed flow and electronic scanning allow for instantaneous measurement of portal vein flow. This method was used to monitor alterations in splanchnic blood flow during exercise.
Measurements of portal vein blood flow were performed in eight healthy males at rest and at 10-min intervals during cycle ergometry at 70% of maximal aerobic capacity. Subjects stopped cycling briefly (approximately 30 s) and stopped breathing while measurements were made. Flow was calculated from values obtained for velocity of red blood cell passage and cross-sectional area of the vessel.
Cross-sectional area decreased during exercise, resulting in a significant decrease in flow over time (P = 0.0001 by ANOVA). The flow within the portal vein had decreased by 80% after 60 min of exercise (absolute flow, 0.63 +/- 0.13 L x min(-1) at rest and 0.13 +/- 0.04 L x min(-1) at 60 min).
Electronic Doppler flow measurement of portal vein flow is a viable, noninvasive technique that can be used to measure splanchnic blood flow. Values obtained as a result of intensive exercise are in line with earlier results obtained with other techniques.
多普勒脉冲血流和电子扫描可实现门静脉血流的即时测量。本方法用于监测运动期间内脏血流的变化。
对8名健康男性在静息状态下以及在以最大有氧能力的70%进行蹬车测力试验期间，每隔10分钟测量一次门静脉血流。测量时受试者短暂停止蹬车（约30秒）并屏住呼吸。血流根据红细胞通过速度和血管横截面积的测量值计算得出。
运动期间血管横截面积减小，导致血流随时间显著减少（方差分析，P = 0.0001）。运动60分钟后门静脉内的血流减少了80%（静息时绝对血流为0.63±0.13 L·min⁻¹，60分钟时为0.13±0.04 L·min⁻¹）。
门静脉血流的电子多普勒血流测量是一种可行的非侵入性技术，可用于测量内脏血流。高强度运动所获得的值与早期用其他技术获得的结果一致。
