Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Relation of inspiration time and expiration time during test. The vertical black lines represent the beginning of the next phase. First: from rest to exercise phase. Second: from exercise phase to recovery phase. X axis: time progression (min:s). Y axis: inspiration and expiration (s).
