-during exercise, an increase in motor unit recruitment must take place so that more muscle fibres are activated to contract for more forceful muscluar contractions
-the greater the force or effort required, the greater the number of motor units recruited and the greater the number of muscle fibres activated
increased muscle temperature
increased blood flow to the muscles, coupled with the heat generated as a by-product of the increased production of ATP during exercise, results in an increase in muscle temperature
increased blood flow to working muscles
the extra demand of the muscles for oxygen during exercise leads to vasodilation of the capillaries and redistribution of blood flow from non-essential organs to the working skeletal muscles
increased muscle enzyme activity
-enzyme activity increases during exercise to produce the increased amounts of ATP required by the muscles
-enzymes are involved in all of the chemical processes that produce energy via the three energy pathways
