Abstract
Creatine (Cr) was first discovered as an organic constituent of meat some time in the early 1800s. Later in the 1800s, Cr was consistently detected in muscle tissue extracted from various mammals. It was noted that foxes killed in a hunt immediately after running, contained significantly more Cr than normal, providing the first indication that muscular contraction results in an accumulation of Cr. Around the same time, a substance called creatinine (Crn) was detected in the urine and later determined to be a breakdown product of Cr. Phosphocreatine (PCr) was first isolated from muscle tissue in 1927 and found to play an important role in the transfer of energy. Around the same time, two researchers who consumed large quantities of Cr noted that a percentage of the Cr ingested could not be accounted for by excretion in the urine (1). This study was one of the first to indicate that “Cr loading” in muscle is possible when large amounts of Cr are consumed. A great deal of research has been done since this early work to further define the importance of Cr in humans, and the impact of Cr supplementation. In this chapter, the basic metabolism and function of Cr in humans will be overviewed. To what extent and what factors influence blood- and muscle-Cr levels in response to Cr supplementation will be discussed. Also some of the proposed mechanisms that account for the ergogenic effects from Cr usage observed in many studies will be explored.
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Volek, J.S., Ballard, K.D., Forsythe, C.E. (2008). Overview of Creatine Metabolism. In: Stout, J.R., Antonio, J., Kalman, D. (eds) Essentials of Creatine in Sports and Health. Humana Press. https://doi.org/10.1007/978-1-59745-573-2_1
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DOI: https://doi.org/10.1007/978-1-59745-573-2_1
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