The body does not store a lot of ATP Energy therefore it has to be constantly resynthesised using different energy pathways.
- The next energy pathway is aerobic glycolysis, which requires oxygen for metabolism.
- The aerobic glycolysis pathway can be sustained to deliver moderately intense activity if the cells are supplied with glucose from glycogen stores in the muscles and liver and if the red blood cells (RBCs) keep delivering oxygen.
- When RBCs run low on glucose oxygen delivery is compromised. Energy metabolism in muscles is forced to function as anaerobic glycolysis (without oxygen) which generates a lot less energy (only 2 ATP per glucose molecule).
- This also produces lactic acid which is an important factor is predisposing muscles to cramp and injury.
- Each energy system contributes to the energy needs of the body but dominate at different times depending on the duration and intensity of physical activity.
- Minerals and trace elements have important roles in metabolism as co-factors and catalysts and are pivotal in determining when the switch to less efficient pathways occurs, compromising performance in terms of stamina.
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