muscle+fatigue

=Muscle Fatigue= What is [|muscle fatigue] one may wonder. Muscle fatigue is when the muscle is in a state of physiological inability to contract.

What Causes Muscle Fatigue?
As the muscle fatigues, a lot is going on. [|ATP] (adenosine triphosphate) production is failing to keep pace with ATP use. Another way to put this is the muscle is using more ATP than is being created. There is a relative defecit or lack of ATP which is causing contractures. Lactic acid is accumulating in the muscle. Ionic imbalances are occuring. Someone who is more and shape and works out regularly can exercise longer than one who does not exercise on a regular basis and is out of shape. Because the person exercises regularly, their body is used to it. One who is not used to the impact may have muscles that are fatiguing soon after they begin their workout.[|Dr. Andrew Marks] from Columbia University Medical Center did a study on muscle fatigue. He came to the conclusion that muscle fatigue may be due to a [|"leak" of calcium] in small channels in the muscle cell. Because calcium plays such a major roll in muscle contraction, it also plays a roll in fatigue. If calcium is leaking then theres not the same amount of calcium being used as before. This makes the contractions of the muscles weaker. With weaker contractions, the body is not able to produce as strong of movements as when the person first started their workout. He also concluded that when the calcium leaks is stimulates an enzyme that attacks muscle fibers which also can lead to muscle fatigue. Another resarcher concluded that "exercise can significantly improve energy levels and decrease fatigue". Muscle fatigue also easily occurs when one is already fatigued from a long day at work. Their body is already feeling lousy then they add an intense workout on top of it.

High Intensity Workout
[|Intense] or a higher impact workout (such as heavy weight lifting or sprinting) produces muscle fatigue faster. The higher impact workout has a more rapid recovery than that of the lower intensity. The reason that the higher intensity workout produces such fast muscle fatigue is because the sodium (Na+) and the potassium (K+) pumps cannot restore ionic balances quickley enough to continue on having the same amount of energy as before. When one is doing a higher intensity workout, their body is using an anaerobic metabolism system which can only produce a given amount of ATP at one time. This process does not require oxygen.

Low Intensity Workout
A [|lower intensity] workout (such as walking or an easy swim) produces a slow developing speed of muscle fatigue. The lower intensity workout has a slow recovery compared to a high intensity workout. When one is doing a lower intensity workout, their body is using an aerobic metabloism system which uses oxygen from the blood stream. This allows the person to go exercise longer because more ATP is being produced.