The effects fibers of creatine in muscle Train for extended periods of time leads to a depletion of glycogen reserves and phosphocreatine (the form in which the creatine is stored) in the skeletal muscles. Previous research suggest that the depletion of reserves of creatine is in the slow-twitch muscle fibers (type 1) that fast (type 2) is due to depletion of glycogen, with the consequent fatigue process. However, no researcher has ever bothered to determine the concentrations of glycogen in different muscle fibers. In order to examine the changes that occur in the creatine and glycogen during a submaximal training, British researchers did male runners run 6 to 70% of VO2max. They were also made of muscle biopsies (tissue samples): at rest, after 10 minutes of training and once you reach the point of exhaustion. During the first 10 minutes of training, the process of demolition of glycogen was similar for all the muscle fibers, while only those with type 2 used significantly p...
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