CanFitPro Personal Training Specialist Test 2025 – 400 Free Practice Questions to Pass the Exam

When the Lactate Threshold (LT) is reached, it means that the body is exercising at an intensity where the muscles are not receiving enough oxygen to meet the demand for energy. As a result, the anaerobic systems must kick in to produce ATP, leading to an increase in their contribution. This is seen as an increase in lactate production and a decrease in the body's ability to maintain a steady state of exercise. The other options are incorrect because they involve the aerobic system, which is not the primary energy source when the LT is reached. The aerobic system does not increase its ATP contribution as it is already working at its maximum capacity and the fatty acid oxidation system is not immediately activated as it takes more time to produce ATP compared to the anaerobic systems.