1.The process of contracting a muscle involves the process of oxidation-in effect, a form of burning, which is why we say you "burn calories" (create heat by the release of energy usually stored as fat) when you exercise. Oxidation requires both a source of fuel, which in the muscles is ATP, and oxygen. Whenever ATP or oxygen is in too short supply, the muscle fibers can't contract until they are replenished as you rest and recover.
2.Another limiting factor is the buildup of waste products that result from the burning of calories due to the muscular contraction. The burning sensation felt in a muscle as you continue to carry out repetitions of an exercise is due to the accumulation of lactic acid in the muscles used. When you stop to rest, the body removes the lactic acid from the area and you are able to do more repetitions.
Enhancing Factors:
1. Increase in amount of ATP available for muscles. This can be achieved by using a nutritional supplement called creatine phosphate. The way creatine works is: it transports the phosphate required in the conversion of ADP (Adenosine Diphosphate) to ATP (Adenosine Triphosphate). ATP provides the muscle with the energy needed for it to contract. Muscles have only a limited supply of ATP and once it is used up, the body has to find ways to convert the useless ADP back to ATP. The fastest way this reaction happens in the body is using the phosphate from creatine phosphate.
2.Continuously training your muscles by lifting weights will gradually lead to muscle growth, thus enhancing muscular contraction . When muscles contract continuousl times to move a heavy load, the muscle fibers will tear. If a sufficient amount of protein is available, your body will naturally overcompensate for the muscle fibers which were broken down during the workout. Overcompensating means regenerating the already existent fibers and creating new ones.This overcompensation is what causes muscles to become bigger, consequently making them stronger
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