resp

• increased RR 


  number of breaths taken per minute.

  -as exercise begins, RR increases, resulting in more air entering our lungs, resulting in more oxygen getting into the body
• increased TV


  amount of air breathed in or out per breath.

  -as exercise begins, TV increases, allowing more oxygen to be taken into the lungs 

  • TV plateaus at a high intensity, meaning after this point any further increase in total ventilation is as a result of increased RR
• increased ventilation


  amount of air that can be breathed in or out per minute, and is the product of RR x TV = V.

  -an increase in RR or TV will result in an increase in ventilation, meaning more air (and therefore oxygen) is able to enter the lungs, where it can be diffused and transported via the blood to working muscles 
• increased pulmonary diffusion


  -during diffusion, gases diffuse from an area of high to low concentration.

  -oxygen moves from the lungs into the bloodstream and is transported to working muscles, while carbon dioxide moves from the bloodstream to the lungs for exhalation

  -increased diffusion occurs when the surface area of the alveoli increases during exercise