title: Effect of exercise on portal vein blood flow in man.
abstract: OBJECTIVE
  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.
  
  
  METHODS
  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.
  
  
  RESULTS
  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).
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Sports Medicine and Human Physiology, Academic Hospital, Free University of Brussels, Brussels, Belgium. nancy.rehrer@stonebow.otago.ac.nz
authors.forename: N J
authors.initials: NJ
authors.lastname: Rehrer
authors.forename: A
authors.initials: A
authors.lastname: Smets
authors.forename: H
authors.initials: H
authors.lastname: Reynaert
authors.forename: E
authors.initials: E
authors.lastname: Goes
authors.forename: K
authors.initials: K
authors.lastname: De Meirleir
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008297:Male; D011169:Portal Vein / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000502:physiology*; D012039:Regional Blood Flow; D018617:Ultrasonography, Doppler, Pulsed