Effects of age on hemorheological responses to acute endurance exercise
Issue title: Selected Proceedings of the 16th Conference of the European Society for Clinical Hemorheology and Microcirculation (ESCHM), 18–21 June, 2011, Munich, Germany
Affiliations: Department of Sport and Exercise Physiology, Faculty of Sport Sciences, Shahid Beheshti University G.C., Tehran, Iran | Department of Sport Sciences, Tabriz University, Tabriz, Iran | Faculty of Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran | Laboratory ACTES, Department of Physiology, University of the French West Indies, Campus of Fouillole, Pointe-a-Pitre, Guadeloupe
Note: [] Corresponding author: Dr. Sajad Ahmadizad, Department of Sport and Exercise Physiology, Faculty of Sport Sciences, University of Shahid Beheshti, Velenjak Square, Evin, Tehran 1983963113, Iran. Tel.: +98 21 29902931; Fax: +98 21 22431953; E-mail: [email protected]
Abstract: The purpose of this investigation was to examine the effects of age on the acute responses of hemorheological variables and biochemical parameters to a single bout of sub-maximal endurance exercise. Fifteen young (20–30 years), 15 middle-aged (40–50 years) and 12 old (60–70 years) male subjects participated in the study. All subjects performed one single bout of endurance exercise encompassed 30-min cycling at 70–75% of maximal heart rate which was followed by 30-min recovery. Three blood samples were taken before, immediately after exercise and after 30-min recovery. Resting levels of hematocrit, red blood cells count, plasma albumin and fibrinogen concentrations, plasma viscosity and whole blood viscosity were significantly different among the three groups (P < 0.01). Thirty minutes of cycling resulted in significant increases (P < 0.05) in all parameters; while these changes were temporary and returned to pre-exercise level at the end of recovery. Responses of all parameters to exercise and recovery were not significantly different among the three groups (P > 0.05). Fibrinogen changes during exercise and recovery were corrected for exercise- and recovery-induced changes in plasma volume. Data analysis showed effects of exercise and recovery only for raw data (P > 0.05). In addition, raw and corrected fibrinogen data in response to exercise and recovery were not age-related. Our results demonstrate that age does not affect the hemorheological responses to an acute endurance exercise in healthy men.
