van der Brug G E, Peters H P, Hardeman M R, Schep G, Mosterd W L
Department of Medical Physiology and Sports Medicine, University of Utrecht, The Netherlands.
Int J Sports Med. 1995 May;16(4):231-7. doi: 10.1055/s-2007-972997.
Thirty-one male triathletes performed three experimental trials at one week intervals, with either a semi-solid or liquid carbohydrate feeding, or a liquid placebo. Exercise consisted of three hours of alternately cycling, running, cycling, and running at 75% VO2 max. Venous blood samples were taken before and immediately after the exercise. Viscometry was performed with a Contraves LS-30 viscometer and erythrocyte deformability was measured with the LORCA, a laser diffractometric system. Exercise caused a significant increase in whole blood and plasma viscosity, hematocrit, and osmolality, and a very small, but significant decrease in erythrocyte deformability, irrespective of the feedings consumed. Changes were not related to exercise performance, as defined by the maximal test time, probably due to a large fluid intake. The intake of different amounts of carbohydrate had no influence on the hemorheological parameters, probably since water content was equal among feedings. Erythrocyte deformability changes were small in comparison with the other hemorheological changes and a correlation between erythrocyte deformability and other parameters was absent. This may be due to erythrocyte properties to counterbalance volume shifts to ensure an optimal oxygen delivery in the microcirculation.
31名男性铁人三项运动员每隔一周进行三次实验性试验，分别摄入半固体或液体碳水化合物，或液体安慰剂。运动包括以最大摄氧量的75%交替进行三小时的骑行、跑步、骑行和跑步。在运动前和运动后立即采集静脉血样。使用Contraves LS-30粘度计进行粘度测定，并用LORCA（一种激光衍射系统）测量红细胞变形性。无论摄入何种食物，运动都会导致全血和血浆粘度、血细胞比容和渗透压显著增加，以及红细胞变形性非常小但显著降低。这些变化与由最大测试时间定义的运动表现无关，可能是由于大量饮水。不同量碳水化合物的摄入对血液流变学参数没有影响，可能是因为各种食物中的含水量相同。与其他血液流变学变化相比，红细胞变形性变化较小，且红细胞变形性与其他参数之间不存在相关性。这可能是由于红细胞具有平衡体积变化的特性，以确保微循环中最佳的氧气输送。
