Effect of a session training on serum concentration of immunoglobulin A, cortisol and lipoprotein in the morning and the afternoon in elite male Taekwondo

Abstract

<em>Introduction: </em>Studies show that our body follows a daily cycle so-called circadian rhythm which affects a large number of physiological and psychological actions such as body temperature, metabolism, blood pressure, hormone secretion and athletic performance. The purpose of this study was to investigate the effect of a training session on serum concentrations of immunoglobulin A, cortisol and lipoprotein at different hours of the day in elite male Taekwondo athletes.<br /> <em>Material & Methods: </em>Twenty eight elite male sport of Taekwondo athletes with 23.7±2.7 years old and 10.2±5.4 years experience in sports were divided into two groups as experimental group (n=14) and control group (n=14) randomly. The experimental group did a steady training program for 60 min corresponded with 70-90 percentage of their heart rate reserve at 08:00 A.M and 08:00 P.M in two different days. The control group rested at the same time and place. Blood samples were collected before and after training.<br /> <em>Results: </em>Serum cortisol concentrations before and after training was higher in the morning significantly (P<0.05) and there was no significant difference between serum immunoglobulin A concentrations before training in the morning and at the afternoon. Serum cholesterol concentrations after the training in the afternoon were lower than after exercise in the morning significantly (P<0.05), serum HDL concentrations in the morning were higher than in the afternoon (P<0.05), serum vLDL and TG concentrations were higher in the afternoon than the morning (P<0.05).<br /> <em>Conclusions: </em>Results show that a training session is effective on concentrations of serum lipids and lipoproteins and is associated with circadian changes in some of factors, so that a training session in the morning was leading to increased in serum cortisol concentrations of the elite Taekwondo athletes.