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1. Synthesis of enzyme protein increased.
2. An increase in number of motor units in a task.

SKELETAL SYSTEM:

Lack of optimum exercise will result in decomposition of calcium and phosphate.

CARDIO VASCULAR

Heart Rate:

1. Regular exercise increasing the heart rate to 140/m for a 10-15 minutes reduces the resting heart rate.
2. A trained long distance runner may have a resting heart rate of 40-50 beats per minute.
3. The recovery phase is faster in trained athlete.
4. As the result of training the heart increases in size because of heart muscle hypertrophy.
5. The heart increases its contractility - that is its ability to squeeze more blood from the Ventricles.
6. The stroke volume out put of the heart increases

	Normal man	Athlete
Stroke Volume Maximal	116 milli litre	161 milli litre