CanFitPro Personal Training Specialist Practice Test

At what point does lactic acid begin to form during the Anaerobic (Glycolytic) System?

1. Immediately as exercise begins

2. After glycolytic energy system uses glucose from the bloodstream

3. When oxygen levels increase

4. Before glycogen stores in the muscle are depleted

The correct answer is: After glycolytic energy system uses glucose from the bloodstream

The Anaerobic (Glycolytic) System primarily relies on glucose from the bloodstream as a source of energy. As soon as exercise begins, this system starts using up this glucose. When the glucose supply is used up, the body will switch to another energy system or there will be a decrease in performance. This means that lactic acid begins to form after the glycolytic energy system starts using up the glucose from the bloodstream and not immediately as exercise begins. Option A is incorrect because lactic acid production is not instantaneous and requires a depletion of glucose. Option C is incorrect because lactic acid production is associated with a decrease in oxygen levels, not an increase. Option D is incorrect because lactic acid production is not dependent on glycogen stores in the muscle, but rather the use of glucose from the bloodstream.