AEROBIC AND ANAEROBIC ENERGY SYSTSEMS Anaerbic Energy Systems

AEROBIC AND ANAEROBIC ENERGY SYSTSEMS

Anaerbic Energy Systems � ATP-PC System � Lactic Acid System (Anaerboic Glycolysis) � ATP-PC System: � PC+ADP ATP lasts about 10 secs as PC (phospho-creatine) stores run out in about 10 secs.

Energy Systems � Have enough ATP stored in muscle to produce contractions for about 1 -2 secs. This energy is available instantaneously � ATP stored – used for energy, yields ADP + PC then PC splits yielding energy that allows ADP to add a PC molecule to form ATP, this repeats until PC stores are depleted

Anaerobic Energy Systems Lactic Acid System (Anaerobic Glycolysis) energy for 10 s-3 minutes � Glucose+2 ATP 2 Pyruvic Acid +4 ATP with a by-product of lactic acid � If energy demands are high, more glucose is broken down and more pyruvate is produced. � If not enough O 2 in mitochondria (O 2 deficit/debt), H+ binds to the pyruvate forming lactic acid � As lactic acid builds, it interferes with muscle contraction and muscle stops contracting � Once sufficient O 2 is obtained (slow down or stop contractions), lactate is cleared and used for energy or converted to glucose. �

Aerobic Energy Production � Glucose+2 ATP 2 Pyruvic Acid +4 ATP with a by-product of lactic acid � If enough O 2 is present, H+ binds with O 2 to form Acetyl Co A which then enters a series of chemical reactions producing 36 ATP molecules, this can be repeated indefinitely as long as O 2 is present (submaximal exercise) and glucose is available.

Summary of Energy Systems � High Intensity Energy Demands are met –ATP-PC system (10 s) � - Lactic Acid System ( 10 -3 minutes) � Lower Intensity Exercise (3 minutes and above)Aerobic Glycolysis � Energy systems overlap- any intensity lasting more than 10 minutes is fueled increasingly by the aerobic energy system (aeroboic glycolysis).