HUMNNTR 2210 Lecture Notes - Lecture 22: Pyruvic Acid, Glycogen, Carbohydrate

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Physical fitness: ability to perform moderate to vigorous activity without undue fatigue, fat usage by the body. Increased physical fitness means improved usage of fat for energy. Why do we exercise: strengthens bones and joints, reduce blood pressure, reduces stress. What is needed to exercise: energy (atp) Fuel for muscle work: atp (adenosine tri phosphate) Only small amount is stored in resting cells. Pcr + adp cr + atp. Glucose utilization (glycolysis: glucose pyruvate, [limited oxygen (anaerobic, 2 atp)] lactate, [plenty of oxygen (aerobic, 30-32 atp)] co2 +h2o, anaerobic glycolysis. 30 seconds to 2 minutes of work. Changes un muscle activity inhibits energy production: aerobic glycolysis. 2 minutes to 3 hours of work. Temporary storage of glucose in liver and muscle. Muscle glycogen: used only by that muscle. Liver glycogen: released into bloodstream, during low to moderate intensity. Can sustain work for up to 2 hours. Fat fuel (fatty acid: majority of stored energy in body, fatty acids.

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