title: Effects of a meal on the hemorheologic responses to exercise in young males.
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Ergonomics and Exercise Physiology, Faculty of Health Sciences, Jagiellonian University Medical College, 31-531 Cracow, Poland.
authors.forename: Jan
authors.initials: J
authors.lastname: Bilski
authors.affiliation: Department of Clinical Rehabilitation, University School of Physical Education, 31-571 Cracow, Poland.
authors.forename: Aneta
authors.initials: A
authors.lastname: Teległów
authors.affiliation: Department of Ergonomics and Exercise Physiology, Faculty of Health Sciences, Jagiellonian University Medical College, 31-531 Cracow, Poland.
authors.forename: Janusz
authors.initials: J
authors.lastname: Pokorski
authors.affiliation: Department of Ergonomics and Exercise Physiology, Faculty of Health Sciences, Jagiellonian University Medical College, 31-531 Cracow, Poland.
authors.forename: Jacek
authors.initials: J
authors.lastname: Nitecki
authors.affiliation: Department of Ergonomics and Exercise Physiology, Faculty of Health Sciences, Jagiellonian University Medical College, 31-531 Cracow, Poland.
authors.forename: Joanna
authors.initials: J
authors.lastname: Pokorska
authors.affiliation: Department of Ergonomics and Exercise Physiology, Faculty of Health Sciences, Jagiellonian University Medical College, 31-531 Cracow, Poland.
authors.forename: Ewa
authors.initials: E
authors.lastname: Nitecka
authors.affiliation: Department of Clinical Rehabilitation, University School of Physical Education, 31-571 Cracow, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Marchewka
authors.affiliation: Department of Clinical Rehabilitation, University School of Physical Education, 31-571 Cracow, Poland.
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Dąbrowski
authors.affiliation: Joseph Dietl Hospital, 31-121 Cracow, Poland.
authors.forename: Jakub
authors.initials: J
authors.lastname: Marchewka
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D001809:Blood Viscosity / Q000502:physiology*; D004435:Eating / Q000502:physiology*; D004907:Erythrocyte Deformability / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008297:Male; D062407:Meals / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology; D010974:Platelet Aggregation / Q000502:physiology*; D019518:Postprandial Period / Q000502:physiology
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