Energy system - CHEMISTRY IN SPORT SPORT AND THE BODY 1...

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CHEMISTRY IN SPORT: SPORT AND THE BODY 1. SOURCES OF MUSCULAR ENERGY Muscle is a unique tissue! Exercise requires energy and the energy to support muscular contraction is produced during the breakdown of adenosine triphosphate (ATP) to adenosine diphosphate (ADP) and phosphate (P). P ADP ATP + ⎯→ Three energy systems resynthesize ATP: 1. The immediate energy system sometimes known as the ATP- PCr system 2. Anaerobic gylcolysis or lactic acid system 3. Aerobic or oxidative system IMMEDIATE SOURCES OF MUSCULAR ENERGY At the beginning of exercise and during intensive exercise of short duration (e.g., 100m sprint) the immediate energy sources are of primary importance. HIGH ENERGY PHOSPHATES (PHOSPHAGENS) The quantity of ATP stored in the muscles is very small, perhaps sufficient to sustain a sprinter for about 1second of maximal running. ATP must therefore be re-generated if activity is to continue beyond this time and initially it is provided through the breakdown of another high energy phosphate, creatine phosphate (CP).
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