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Creatine supplements are marketed in ethyl ester, gluconate, monohydrate, and nitrate forms. [40] Creatine supplementation for sporting performance enhancement is considered safe for short-term use but there is a lack of safety data for long term use, or for use in children and adolescents. [41] Some athletes choose to cycle on and off creatine ...
A simple means of estimating renal function is to measure pH, blood urea nitrogen, creatinine, and basic electrolytes (including sodium, potassium, chloride, and bicarbonate). As the kidney is the most important organ in controlling these values, any derangement in these values could suggest renal impairment.
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The idea of the creatine phosphate shuttle was suggested as an explanation for altered blood glucose levels in exercising diabetic patients. [5] The change in blood glucose levels were very similar to the alterations that would occur if a diabetic patient would receive a shot of Insulin.It was then proposed that contraction of myofibrils during rigorous exercise freed creatine which imitated ...
ATP + Creatine → H + + ADP + CP (Mg 2+ assisted, catalyzed by creatine kinase) ADP + P i → ATP (during anaerobic glycolysis and oxidative phosphorylation ) When the phosphagen system has been depleted of phosphocreatine (creatine phosphate), the resulting AMP produced from the adenylate kinase (myokinase) reaction is primarily regulated by ...
A 70 kg man contains around 120 g of creatine, with 40% being the unphosphorylated form and 60% as creatine phosphate. Of that amount, 1–2% is broken down and excreted each day as creatinine. Phosphocreatine is used intravenously in hospitals in some parts of the world for cardiovascular problems under the name Neoton, and also used by some ...
Creatine is produced by the enzyme guanidinoacetate methyltransferase (GAMT). After production in the liver and kidneys, creatine is transported to organs and tissues with high energy demands, most commonly the brain and skeletal muscles. In addition to endogenous production, creatine can be obtained from dietary sources or supplementation.
The typical human reference ranges for serum creatinine are 0.5 mg/dL to 1.0 mg/dL (about 45 μmol/L to 90 μmol/L) for women and 0.7 mg/dL to 1.2 mg/dL (60 μmol/L to 110 μmol/L) for men. The significance of a single creatinine value must be interpreted in light of the patient's muscle mass.