Blood Viscosity Responses to Maximal Exercise in Endurance-Trained and Sedentary Female Subjects

摘要

To assess whether the rheological properties of blood might be altered by exercise, we measured whole blood viscosity, plasma viscocity, and its components in healthy female subjects before, immediately after, and 1 h after maximal upright exercise using the Bruce graded exercise protocol. Forty-seven female subjects (15 sedentary, 14 who ran 5-15 miles/wk, and 18 who ran > 50 miles/wk), ages 18-43 yr, were evaluated. Whole blood viscosity, measured with a cone and plate viscometer, increased an average of 12.6% with exercise. The increase was greater than can be attributed to the observed 8.9 % increase in hematocrit alone due to a coincident increase in plasma protein concentration.