Effects of a Meal on the Hemorheologic Responses to Exercise in Young Males

Abstract

Aim. This study investigates the changes in hemorheologic parameters resulting from exercise followed by a standard meal. Methods. In twelve moderately active men a period of exercise on a bicycle ergometer for 30 min at 60% VO2max was followed by a test meal or by 30 min rest. Venous blood was sampled for further analysis at baseline, after exercise, and after the meal/rest period. Results. The elongation index (EI) was reduced and a marked rise in plasma viscosity was observed after exercise. A significant decrease in half time of total aggregation (T 1/2) and a rise in aggregation index (AI) after exercise were observed; however, after the postexercise period these changes were reversed. Conclusion. The present study demonstrates that physical exercise causes several changes in blood rheology parameters, such as an increase of blood viscosity, a decrease in EI and an increase in AI, and a fall in the T 1/2 values. The meal eaten in the postexercise period caused a further reduction in EI values indicating higher red cell rigidity, but not in plasma viscosity or aggregations indices. Such alterations in hemorheologic parameters should not impair the function of the cardiovascular system in fit and healthy people but it could constitute a serious risk under various pathophysiological conditions.

Effects of Various Hypobaric Hypoxia on Metabolic Response, Skeletal Muscle Oxygenation, and Exercise Performance in Healthy Males

“…6 This decrease in hemorheological function plays a key role in reducing exercise performance because it lowers oxygen supply to microvessels and tissues. 7,17 the increase was more pronounced as hypoxia became more severe. However, the S P O 2 (P < 0.05) and O 2 pulse (P < 0.05) presented a significant decrease under hypoxia compared to normoxia.…”

Blood Morphological and Biochemical Indicator Characteristics in Men Performing Different Physical Activities in the Cold—A Preliminary Report

“…One important factor sustaining physical and mental well-being [21] and enabling the process of successful aging is an adequate level of physical activity [22,23]. Regular winter swimming and amateur running have an impact on efficient blood flow through the arteries, veins, and capillaries.…”

Response of peripheral arterial pulse wave velocity to acute exercise in patients after recent myocardial infarction and healthy controls

“…Further, we did not measure blood viscosity and can therefore not exclude the group difference to be due to different responses in blood viscosity. Namely, exercise has been shown to increase blood viscosity immediately post-exercise by approximately 12%-20% in young healthy volunteers [5,44,45].…”