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Original articles  ANGIOlOGY 

The Journal of Sports Medicine and Physical Fitness 2003 March;43(1):105-10

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

The effect of acute plasma volume expansion on venous capacitance

Boucher Y. N., Hamer M., Boutcher S. H.

De Montfort University, Bedford, UK


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Aim. The pur­pose of ­this ­study was to ­examine the ­effect of ­plasma ­volume (PV) expan­sion, ­induced by 1 ­single ­bout of ­high inten­sity exer­cise, on ­venous capac­i­tance.
­Methods. Four­teen ­active but ­untrained ­healthy ­young ­males ­were ran­domly ­assigned to an exer­cise (n=7) or con­trol ­group (n=7). The exer­cise pro­tocol con­sisted of 8 4-min ­bouts of exer­cise at 70-85% of max­imal ­oxygen con­sump­tion (V. O2max) ­with 5-min ­recovery ­periods ­between ­bouts. ­Resting and exer­cise HR and ­venous capac­i­tance ­were ­assessed ­before and 24 ­hours ­after one ­bout of ­cycle exer­cise. Exer­cise HR was ­assessed ­during ­cycle exer­cise at 30, 45, and 60% of V. O2max, ­whereas ­forearm and leg ­venous capac­i­tance ­were exam­ined by deter­mining ­limb ­volume ­change ­after 2 min of ­venous occlu­sion at 50 ­mmHg. PV, ­plasma ­albumin, and ­sodium and potas­sium con­cen­tra­tion ­were ana­lysed pre and 24 ­hours ­post exer­cise.
­Results. ­Twenty-­four ­hours ­after one ­single ­bout of exer­cise, PV was ­increased by 7.7%. The ­increase in PV was accom­pa­nied by a ­decrease in exer­cise HR of 5.8% at the 2 ­higher inten­sities (45 and 60% of V. O2max) but no ­change in ­venous capac­i­tance was ­found. No sig­nif­i­cant ­changes in ­plasma ­albumin and ­sodium con­cen­tra­tion ­occurred, ­although potas­sium con­cen­tra­tion was sig­nif­i­cantly ­increased by 29%.
Con­clu­sion. An ­acute exer­cise-­induced ­increase in ­plasma ­volume ­appears to be ­able to ­reduce exer­cise HR but has no ­effect on ­venous capac­i­tance.

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