Which adaptation is associated with aerobic endurance training?

Which adaptation is associated with aerobic endurance training?

• A. Increased oxygen delivery to working tissues
• B. Decreased blood volume
• C. Lower hemoglobin
• D. Reduced cardiac output

Answer: (A)

Endurance training boosts the body's ability to deliver oxygen to exercising muscles. The strongest reflection of this is an increase in oxygen delivery to working tissues. This happens as the cardiovascular system becomes more efficient and the muscles become better at using the oxygen carried by the blood: more capillaries form in the muscle, improving blood flow and oxygen diffusion; plasma volume expands, increasing total blood volume and perfusion; and the heart can pump more blood per beat (greater stroke volume), raising maximal cardiac output. Together, these adaptations enhance how much oxygen reaches and is utilized by the muscles during activity. Decreases in blood volume aren’t typical; endurance training tends to increase blood volume through plasma expansion. Lower hemoglobin isn’t a standard adaptation, and reduced cardiac output isn’t characteristic of aerobic improvements, since maximal cardiac output usually increases with training due to the stronger heart and greater stroke volume.

Endurance training boosts the body's ability to deliver oxygen to exercising muscles. The strongest reflection of this is an increase in oxygen delivery to working tissues. This happens as the cardiovascular system becomes more efficient and the muscles become better at using the oxygen carried by the blood: more capillaries form in the muscle, improving blood flow and oxygen diffusion; plasma volume expands, increasing total blood volume and perfusion; and the heart can pump more blood per beat (greater stroke volume), raising maximal cardiac output. Together, these adaptations enhance how much oxygen reaches and is utilized by the muscles during activity.

Decreases in blood volume aren’t typical; endurance training tends to increase blood volume through plasma expansion. Lower hemoglobin isn’t a standard adaptation, and reduced cardiac output isn’t characteristic of aerobic improvements, since maximal cardiac output usually increases with training due to the stronger heart and greater stroke volume.