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The Effects of an Acute Running Exercise Training Session on Changes in Serum Beta-Endorphin and Cortisol Levels Among Male Sprint Runners



Sinaei M1 ; Kargarfard M2 ; Talebi A3 ; Sharifirad GR4 ; Arbzade A5
Authors
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Authors Affiliations
  1. 1. Department 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 Pathology, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Department of Physiology, School of Physical Education and Sport Sciences, Khorasgan Branch, Islamic Azad University, Isfahan, Iran
  5. 5. Isfahan University of Medical Sciences, Isfahan, Iran

Source: Journal of Isfahan Medical School Published:2012

Abstract

Background: Previous studies have often focused on plasma beta-endorphin (?-EP) and cortisol responses to either sub-maximal or maximal exercise. However, little research has been conducted on the effects of professional exercise sessions on? -EP and cortisol secretion levels. The aim of this study was to assess changes in plasma?-EP and cortisol levels in male sprint runners after one session of 200 meters run exercise training. Methods: In a quasi-experimental study, 14 healthy male elite runners (mean age: 21.38 ± 2.76 years, mean weight: 69.78 ± 6.76 kg, mean height: 182.21 ± 5.22 cm, and mean body mass index of 20.99 ± 1.62 kg/m2) purposefully and voluntarily participated in this study. After a two hour exercise session, the subjects ran 200 meters in 23 seconds with an intensity equivalent to 80-85% of maximum oxygen consumption. Venous blood samples were taken from the right arm of the subjects to measure levels of?-EP and cortisol before exercise, immediately after specialized training, and 30 minutes after exercise. Serum blood samples were separated immediately in a refrigerated centrifuge at +4°C. They were then transferred to a -70°C refrigerator for future assessments.?-EP and cortisol were measured using enzyme -linked immunosorbent assay (ELISA) method. Data was analyzed using analysis of variance (ANOVA). Findings: Levels of?-EP among male sprint runners significantly differed between the three measurements (P ≤ 0.05). The paired comparison test showed a significant difference between the Mean?-EP level before training and in the recovery period (P ≤ 0.05). In addition, no significant differences in cortisol levels were observed (P ≥ 0.05). Conclusion: The results showed that an acute exercise session caused significant increases only in levels of serum?-EP hormones among sprint runners.
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