Lactate is continuously produced in skeletal muscle, even at rest, but with the onset of exercise, increases in the glycolytic resynthesis of ATP result in a correspondingly greater production of lactate in active fibres. Lactate metabolism is a dynamic process and while some fibres produce lactate, adjacent fibres simultaneously consume it as an energy source. [...]
Aerobic fitness may be defined as the ability to deliver oxygen to the exercising muscles and to utilize it to generate energy during exercise. Aerobic fitness therefore depends upon the pulmonary, cardiovascular and haematological components of oxygen delivery and the oxidative mechanisms of the exercising muscle. Maximal oxygen uptake (VO2max), the highest rate at which [...]