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Intensive physical activity largely modulates resting concentrations of blood cortisol (C) and testosterone (T) and their molar ratio, which is defined as the anabolic-catabolic index and expressed as T/C × 10 2 . The aim of the study is to evaluate the effect of the author's high-intensity training program on T, C, T/C × 10 2 , and selected physical fitness indices in men between 35 and 40 years of age.

The Effect of High-Intensity Interval Training Periods on Morning Serum Testosterone and Cortisol Levels and Physical Fitness in Men Aged 35–40 Years