IPL'S LETS GET FIT~MUSCLE FATIGUE,..CAUSES

[IronpumpedLady]

TweetEveryone who exercises realizes that you can’t exercise at a high intensity for long before your muscles tire. You may also know that how long you go depends upon how hard you go. So what causes fatigue and why does it occur faster when you exercise harder?
The reason has to do with several factor including the availability of energy to fuel muscle contractions and the mechanism of calcium in muscle cell action.

Energy Pathways - Aerobic and Anaerobic Metabolism
First, let's consider the energy pathways the body uses for exercise at different intensities. During intense exercise, such as sprinting or lifting heavy weights, muscles rely on anaerobic metabolism, which can only produce a certain amount of energy at a time, unlike the aerobic metabolism system, which can produce energy over hours.

Muscles use something called ATP (adenosine triphosphate) as an energy source. ATP is created in essentially two ways. One is by aerobic metabolism using oxygen carried in the bloodstream. This is a sure and steady way to create virtually unlimited sources of energy; however, it has a limit on how fast it can work. The cardiovascular system is limited in its ability to quickly deliver blood and oxygen to the working muscles. Because of this, during high intensity exercise, ATP is also provided by anaerobic metabolism that don't require an ongoing supply of oxygen. Anaerobic pathways can provide ATP immediately, but they also have limited stores that need to be refilled after they are used up.

Training can make a difference in how long and fast both of the metabolic pathways work. Trained athletes have a greater ability to quickly deliver oxygen to the working muscles which increases the ability to use aerobic metabolism at a higher exercise intensity. Trained athletes also develop a greater efficiency in both energy deliver, and skill. Finally training may improve the way the body creates and uses the anaerobic systems so you can access ATP more readily

The Role of Calcium in Muscle Fatigue
Physiologists at Columbia University Medical Center recently published research findings in the Proceedings of the National Academy of Sciences that may provide a new explanation of muscle fatigue.

This study found that muscle fatigue experienced by athletes after long and intense exercise may be caused by a problem with calcium flow inside muscle cells. According to Dr. Andrew Marks, who lead the study, fatigue occurs due to tiny leaks of calcium inside the muscles. One of the functions of calcium is to help control muscle contractions. This research found that after extended high-intensity exercise, small channels in the muscle cells begin to leak calcium, which leads to weakened muscle contractions. This leaked calcium also stimulates an enzyme that attacks muscle fibers and also leads to fatigue.

The study had experienced cyclists riding stationary bikes for three hours a day, for three consecutive days at a high intensity. Muscle cell samples at the end of the third ride showed calcium channel leaks. After a few days of rest, these leaks were repaired.

Although this theory of calcium being involved in muscle fatigue has been around for several years, but this is the first time anyone has been able to identify a specific reason for muscle fatigue.



Stay Strong~~!!!
IPL

[daved150]

Tweetanyone ever try supplemental atp? i tried it and it didnt seem to help at all....i've wondered aboout those intra-workout drinks?

good article ipl