comparison of two methods of high-intensity aerobic and strength training on the levels of testosterone, cortisol, insulin-like growth hormone (igf1) and immunoglobulin (igg) in professional taekwondo athletes مقالة

Introduction: The purpose of this study was to determine the difference between two methods of high-intensity aerobic and strength training on serum testosterone, cortisol, insulin-like growth factor1 (IGF1), and immunoglobulin G (IgG) in professional taekwondo athletes. Material & Methods: This quasi-experimental research was conducted on one group of professional Taekwondo players (n=12) in Rash City with an average age of 22 ± 1.5 years. In three consecutive weeks, three regular training sessions (RTS, 90 minutes), high-intensity strength training (HIST, 80% 1RM, 45min), and high-intensity aerobic training (HIAT, 80% VO2 max, 45 min) were performed. 24 hours after each training session, serum immunoglobulin G (IgG), insulin-like growth hormone (IGF1), plasma testosterone, and cortisol levels were measured after 10 hours of fasting. Data related to the sample are presented with descriptive statistics, and analysis of variance (ANOVA) for repeat measurement was used to evaluate variables. The statistical software program SPSS (SPSS Co, Chicago IL, version 26) was used for data analysis. All statistical tests were performed and considered significant at a P ≤ 0.05. Results: The findings showed a significant increase in testosterone in both HIAT and HIST groups compared to RTS, cortisol in HIST compared to the other two groups, IGF1 in HIAT compared to the other two groups, but IgG in HIST and HIAT compared to RTS showed a significant decrease (p < 0.05). Conclusion: Based on the research findings, probably both training methods can similarly increase plasma testosterone, HIST increases cortisol, and HIAT increases IGF1 in professional taekwondo athletes, but both HIAT and HIST decrease plasma IgG and this drop is greater in HIAT.