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The Effect of an Acute Swim Exercise Training Session on Changes in Serum Beta-Endorphin and Cortisol Levels in Male Sprint Swimmers



Sinaei M1, 3 ; Kargarfard M2 ; Sharifi GR1, 3 ; Rouzbahani R4 ; Arabzadeh A5
Authors
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Authors Affiliations
  1. 1. Department of Exercise Physiology, School of Physical Education and Sport Sciences, Khorasgan Branch, Islamic Azad University, Isfahan, Iran
  2. 2. Department of Exercise Physiology, School of Physical Education and Sport Sciences, The University of Isfahan, Isfahan, Iran
  3. 3. Department of Exercise Physiology, School of Physical Education and Sport Sciences, Khorasgan Branch, Islamic Azad University, Isfahan, Iran
  4. 4. Department of Community Medicine, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  5. 5. General Practitioner, Treatment Affair, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Journal of Isfahan Medical School Published:2011

Abstract

Background: Most previous studies were concentrated on plasma beta-endorphin (ß-EP) and cortisol responses following sub-maximal or maximal exercise; however, little researches have been conducted on the efficacy of sports specialized exercise sessions in ß-EP and cortisol secretions. The aim of this study was to assess changes in plasma beta-endorphin and cortisol levels in male sprint swimmers after one session of swim exercise training. Methods: 15 healthy male elite swimmers as purposefully and voluntarily participated in an semiexperimental study. After a practice session for 2 hours long swimming, participants were swimming in a 50 meters standard pool with an intensity equivalent to 80-85 percent of maximal oxygen consumption. Venous blood samples were taken from the right arm of the subjects to measure levels of beta-endorphin and cortisol in the three steps: 1. Basic conditions, 2. Immediately after specialized training, and 3. 30 minutes after exercise. Serum blood samples separated immediately in refrigeratored centrifuge in +4 °C and then were transferred to assess the variables to the refrigerator -70 °C. Beta-endorphin and cortisol were measured by ELISA kit. Data were analyzed using repeated measures ANOVA test. Finding: There are significant differences between levels of beta-endorphins of male sprint swimmers in the three periods of time before, immediately after and 30 minutes after exercise (P < 0.05). The paired comparison test showed a significant difference between the mean beta-endorphin before and recovery period in the swimmers (P < 0.05). Also, results showed that the changes of cortisol levels in three steps were not significantly different. Conclusion: The results showed that an acute exercise session increase only serum beta-endorphins hormones in sprint swimmers.
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