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.
Time-frequency spectrograms showing the power differences between active and passive walking for (A) slow speed and (B) fast speed in dB. Spectrograms are masked for significance (α < 0.05) with non-significant differences set to 0 dB (green).
