When exercising, a series of changes occur in our body, which vary according to the intensity, duration and conditions of the organism (for example, resistance or physical conditioning).
Think that doing physical activities, in general, requires a lot of the organism, changing its state of inertia. So the body’s forces and attention are focused on performing these activities, supplying energy to the muscles and ensuring that the work of other bodily systems does not fail.
It is as if the body had to divide the tasks, paying special attention to the exercises, as the physical demand is higher at this moment. But he also doesn’t want the heart or kidneys to stop working, so it needs a very smart and balanced distribution.
The activities promote a temporary catabolic reaction in the muscles, with the release of some amino acids from the muscle tissue, at the same time that protein synthesis (amino acid entry into the tissue) is paused.
Between 4 and 8 hours after the end of the exercise, the muscle begins to recover and may even increase the synthesis of amino acids at that time.
Studies point out that leucine is highly degraded during intense exercise, especially when the practitioner is not physically fit.
Thus, people who are starting at the gym tend to spend more leucine than that colleague who has been training for years.
All this effort of the activity generates microlesions in the muscular fibers, that need to be repaired.