NUTR 125 Lecture Notes - Lecture 23: Glycolysis, Polysaccharide, Phosphocreatine
Document Summary
Physical fitness: the ability to perform moderate to vigorous activity without undue fatigue . Increased physical fitness means improved usage of fat for energy. Atp (adenosine tri phosphate): chemical energy used by cells for muscle contractions. Only small amount is stored in resting cells. Phosphocreatine (pcr): high-energy compound that replenishes atp (formed/stored in muscle cells) Changes in muscle acidity inhibits energy production. Glycogen: polysaccharide that serves as a form of energy storage in animals. Temporary storage of glucose in liver and muscle. Muscle glycogen: used only by that muscle. During low to moderate intensity, can sustain work for up to 2 hours. 108 atp for each 16 c fatty acid chain. Majority of stored energy in the body. Fatty acids are converted into atp by muscle cells. Trained muscles have (1) more mitochondria and (2) increased ability to use fat as. Major source during prolonged exercise, but not intense short activity fuel. During moderate exercise, provides 2-5% of calorie needs.
