ANSC 330 Exercise Physiology I

Of exercise body systems work to increase fuel

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Unformatted text preview: e 8 Muscle Contraction Requires ATP ATP + H20 ADP = Pi + H+ + energy Energy Production Energy generated/used each day must be replenished by chemical energy from diet Chemical energy in diet is converted to mechanical energy in body Some products of digestion are absorbed and either used immediately or stored in the liver, muscle, and adipose tissue to be used later 9 Food Energy Primary nutrients capable of releasing f k energy (ATP) for work: Carbohydrates (glucose) Fats (fatty acids) Amino acids: Contribute very little to energy production Structural components of proteins are only broken down during periods of stress, exhaustion, starvation, or disease Energy Storage in the Body Blood: Glucose storage: Glucose and fatty acids are available from blood stream Glycogen in liver and muscle Fatty acid storage: Triglycerides in adipose tissue and muscle 10 Fuel for ATP Generation Cr-P + ADP + H+ Cr + ATP ADP + ADP ATP + AMP Energy Supply During Exercise: Hydrolysis of ATP to ADP and P releases l t ti energy f muscle contraction among for other things ATP + H2O → ADP + Pi + H+ + Energy ATP is stored in small amounts (700 g total in a 500kg horse) ATP is used rapidly 11 Energy Pathways Several biochemical routes for h h l ti f phosphorylation of ADP t ATP to Not used on an all or nothing basis Body uses a combination of energy pathways depending on the nature of the exercise (intensity) and state of fuel stores Pathway 1: Anaerobic (No Oxygen) Oxygen) phosphorylation of ADP u...
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