Figure 7.
HF frequency pattern according to respiratory cycles: (a) 13 s RSP cycle; (b) 12 s RSP cycle; (c) 11 s RSP cycle; (d) 10 s RSP cycle; (e) 9 s RSP cycle.
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.