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

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.

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.

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).

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.