Study aim: To investigate the effects of consecutive aerobic and resistance exercise on Cortisol, Immunoglobulin A (IgA), and Creatine kinase (CK) responses of male students.

Material and methods: Eight subjects (mean age 21.0 ± 1.5 years) completed two trail, aerobic ergometer exercises (60% VO2max; 45-min) and resistance (80% 1RM; 45-min) exercise concurrently; each subject was his own control. Blood samples were collected pre-exercise, post-exercise, and 3 hours after exercise. One-way ANOVA with repeated measure and LSD post-hoc tests were used to evaluate changes in Cortisol, IgA, and CK during baseline and exercise periods.

Results: During baseline, there were no differences between exercise day (ED) values and those obtained at rest day (RD) for Cortisol, IgA, and CK. After exercise, Cortisol concentration in ED was significantly higher than RD (p<0.05); however, changes in IgA and CK responses were not significant.

Conclusions: This type of consecutive exercise didn't increase susceptibility to upper respiratory tract infection and muscle damage. Therefore, it can be useful for the preparation phase of training for athletes.