Keto Trim the alveoli. Fortunately, oxygen transport is a relatively fast process. It is the transport of CO2 from the blood (transported as lactic acid) that takes more time and, therefore, is more sensitive to decreased ventilation and the duration of gas exchange. Even without accumulation of lactic acid, simply hypoventilation will lead to an accumulation of CO2 and will actually have the same effect of increasing lactic acids in your body by sustained muscle work! (cardio, weight, etc.)