Blood rheologic properties were investigated before and after rationed exercise in 26 patients exhibiting risk factors unattended by atherosclerotic signs, 33 coronary patients and 26 normal subjects. Hemorheologic changes in response to bicycle ergometry were shown to depend largely on the efficiency of cardiac performance and be more marked in coronary patients and those exhibiting risk factors, as compared to normal subjects. In addition, the erythrocyte aggregation coefficient increased significantly during rationed exercise in coronary and risk-factor patients, in contrast to normal subjects.
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