Justify the extra time in college required to be come a sports physician

The extra time in college required to become a sports physician is most likely due to the importance and vitality of a sports physician. Although it is a doctor's job to control the damage that has been done, it is a sports physician's job to make sure to prevent these damages from occuring in the first place.

Explanation:

The likely cause of this fatigue are:

Lactic acid accumulating in the muscle. Accumulated lactic acid will force the muscle cells within our body to enter resting period so it could rebuild itself. This condition will cause a fatigue for the athlete
Acidity in muscle cells increases potassium loss from muscles, which will also cause a fatigue for the athlete