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.
Power-spectral density of representative single motor unit discharges from each of the muscles. Note the large power values at the fundamental respiratory frequency and the first 2–3 harmonics of this fundamental frequency. The power in the 30–60-Hz range reflects the approximate mean firing rate of the motor units.
