Tag Archives: stress

Cortisol

Cortisol, also known as a stress-hormone, is a hormone produced by the adrenal cortex and plays an important role in glucose regulation. Since nerve cells can only produce their energy from carbohydrates and glycogen, when blood sugar levels and glycogen stores are low, cortisol stimulates conversion of protein to carbohydrates. This results in increased protein breakdown and it inhibits protein synthesis, effectively breaking down muscle tissue to produce carbohydrates. Cortisol is secreted during times of stress but high intensity resistance exercise stimulates cortisol production as well. Since resistance exercise also stimulates testosterone and growth hormone production, this is not a negative effect, since these more than counter the influence on hypertrophy of cortisol. In fact, it is believed that cortisol plays an essential role in remodeling muscle tissue after training.