Discuss some of the physiological and physical factors that contributes to lactic acid build-up in tissues?
This involves the process of how your muscle cells get their energy to carry out the activities that are required of them. The cells do this in two different ways - Aerobic respiration and Anaerobic respiration.
Aerobic respiration is the break down of glucose to create energy for the cell in the presence of Oxygen.
Whereas Anaerobic respiration is the breakdown of glucose without the presence of oxygen. This process will occur during strenuous exercise such as heavy weight lifting, Sprinting, Swimming, etc.
Where oxygen cannot be supplied to the cells sufficiently enough in order to keep up with the energy requirements.
Respiration is a very complex series of reactions and involves the synthesis of a molecule called ATP.
During these reactions a substrate molecule, formed from glucose, is required to react with a molecule called NAD+. When this reaction occurs NAD+ is converted to the molecule NADH/H+.
During aerobic respiration oxygen would, inadvertently, be used to change this molecule back into NAD+ so it can be used again to react with another glucose molecule.
However in Anaerobic respiration this cannot occur since oxygen isn't present. To compensate for this NADH/H+ reacts with a molecule call pyruvate.
When this happens the molecule lactate is formed or "lactic acid". Hence the longer the cells go without oxygen (or the longer the exercise continues) the more pyruvate is converted into "lactic acid".
There is also a lot of information on this if you search the forum. Good luck.