NUTR 406 Chapter Notes - Chapter 1: Creatine Kinase, Dietary Supplement, Phosphocreatine
16 Mar 2018
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Document Summary
Creatine is consumed in the diet or synthesized in the body from amino acids: beef and fish (about 1-2g per day, dietary supplement (3-5g per day) The creatine phosphate energy system phosphorylates adp to atp rapidly: Low levels of crp = muscle fatigue: duration of creatine phosphate energy system = about 5-10 seconds, crp primarily used during very high-intensity, short duration exercise, atp used very rapidly. Summary of characteristics of creatine phosphate: one chemical step, catalyzed by creatine kinase (ck, very fast reaction, 1 atp : 1 crp molecule, 5-10 second duration, anaerobic, predominant energy system in very high-intensity exercise. Advantages: very rapid way to replace atp. Disadvantages: creatine phosphate is stored in very limited amounts in the muscle, can be depleted rapidly, has a very short duration as an energy system. Creatine supplementation recommendations: application is very specific to strength and power activities.
