Question

why can we observe a continuous increase of rer even after the sprint?
a) increased oxygen levels are needed to produce bicarbonic acid
b) the body needs more oxygen during and after the sprint
c) the body tries to get rid of an excess of carbon dioxide
d) the increased gas exchange helps converting glucose

Explanation:

During a sprint, the body uses anaerobic respiration, leading to an oxygen debt. After the sprint, the body needs more oxygen (oxygen debt repayment) for processes like converting lactic acid to glucose, restoring ATP, etc. Option a is incorrect as oxygen isn't for bicarbonic acid production here. Option c is wrong as excess CO₂ isn't the main post - sprint focus. Option d is incorrect as gas exchange related to glucose conversion isn't the reason for RER increase post - sprint. Option b correctly states that the body needs more oxygen during and after the sprint (to repay oxygen debt, restore energy stores, etc.), which leads to the continuous increase in RER (Respiratory Exchange Ratio) as the body takes in more O₂ and expels CO₂ related to metabolic recovery.

Answer:

b. The body needs more oxygen during and after the sprint