FIRE START – ENERGY BOOST FOR YOUR BODY!
Intensive physical effort is a great metabolic challenge for the body – it requires the efficient functioning of many various biochemical pathways of energy generation, the demand for which may be even 20 to 30 times higher during exercise than during rest. Carbohydrates, namely glucose, constitute the basic source of energy during all types of activity. It can be obtained by working muscles from the following sources (resources): muscle glycogen, supplying the largest amounts of glucose during high-intensity workouts which do not exceed 100 minutes, liver glycogen, constituting the primary source of glucose during long-term medium-intensity workouts.
As the workout progresses, glycogen resources become gradually depleted. When the duration of low-intensity physical effort increases considerably, free fatty acids originating from the decomposition of fat tissue become the primary sources of energy for working muscles.