HPED 2507 Lecture Notes - Lecture 19: Phosphocreatine, Lactic Acid, Blood Sugar
8 Feb 2020
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Document Summary
Understanding the role of nutrition in performance, and potential effects of ergogenic aids can be fostered by basic knowledge of how energy is formed within muscle cells. Part 1 - energy systems: glucose: from muscle and liver glycogen, triglycerides: within adipose tissue and active muscle, amino acids: to a lesser degree. Anaerobic pathways (no oxygen: creatine phosphate system, anaerobic breakdown of glucose (from glycogen) Aerobic pathways (oxygen: pyruvate (from glucose, fatty acids. About 32 atp produced from aerobic glucose catabolism as opposed to only 2 atp from glycolysis. Pyruvate: moderate physical activity glycogen consumed slowly, both glucose and fatty acids used for energy, glycogen stores conserved. The proportion of carbohydrate, fat, and protein used during exercise is dependent on: intensity, duration, body"s ability. 1st 10 minutes muscles use own stored glycogen. 1st 20 minutes moderate activity- use 1/5th of muscle glycogen increase uptake of blood glucose. 20 minutes plus start to use more fat for fuel and less glucose.
