TRAINING PRESCRIPTION FOR AEROBIC ADAPTATION

Question 1

Why does acidosis as a result of high intensity exercise cause an athlete to slow down?

Answer 1

Lactate production causes a proton (H+) to be released which decreases pH .

Decrease in pH inhibits PFK, which is a rate limiting enzyme of glycolysis

Decrease in pH inhibits Ca+ release which affects muscle contraction.

Question 2

Blood volume can increases following steady intensity long distance endurance training. What are the mechanisms that cause an increase in maximal cardiac output following this increase in blood volume?

Answer 2

Increase in blood volume results in an increase in end diastolic volume (EDV)

An increase in EDV results in an increase in stroke volume (SV)

Therefore since heart rate maximum will not have changed, maximum cardiac output will increase as
Qmax = SV x HRmax