Endurance training has been shown to reduce the oxygen deficit in subjects performing a submaximal exercise.This is due to
A)an increased maximal cardiac output.
B)increases in the number of mitochondria and capillaries.
C)an increased heart rate.
D)a greater anaerobic capacity.

Question

Quizplus · Accepted Answer

Endurance training results in increased numbers of mitochondria and capillaries within the trained muscles. Mitochondria are the organelles responsible for aerobic respiration and as a result, there is a greater capacity for the oxidation of fatty acids and carbohydrates. This increased oxidative capacity allows energy to be produced more efficiently in the presence of oxygen, ultimately reducing the oxygen deficit during submaximal exercise. Capillaries are the smallest blood vessels in the body and provide a supply of oxygen and nutrients to muscle fibers. With increased capillary density, more efficient delivery of oxygen and nutrients to the muscles occurs during exercise, reducing the oxygen deficit.

Endurance Training Has Been Shown to Reduce the Oxygen Deficit