ANATOMY

Detailed explanation-1: -Carbohydrate is the only fuel that can be used for both aerobic and anaerobic ATP production, and both systems are activated very quickly during transitions from rest to exercise and from one power output to a higher power output.

Detailed explanation-2: -Adenosine triphosphate (ATP) is the source of energy for all muscle contractions. Energy is released when ATP is broken into ADP+Pi (adenosine diphosphate and phosphate group). Maintaining the availability of ATP for muscle contraction is the limiting factor, since ATP is not stored in large amounts in skeletal muscle.

Detailed explanation-3: -Three energy systems function to replenish ATP in muscle: (1) Phosphagen, (2) Glycolytic, and (3) Mitochondrial Respiration.

Detailed explanation-4: -Adenosine triphosphate (ATP) is the sole fuel for muscle contraction. During near maximal intense exercise the muscle store of ATP will be depleted in < 1s, therefore, to maintain normal contractile function ATP must be continually resynthesized.

Detailed explanation-5: -The main types of “fuel” used by muscle for energy metabolism are glycogen, glucose, and free fatty acids [1-3]. The particular energy sources used by working muscle for aerobic metabolism depend upon a number of factors including the intensity, type, and duration of exercise, physical conditioning, and diet [4-6]: