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.
Correlation matrix between the HRV indices at the initial stage (with the descriptor 0 at the end) of the test packs in the interval of 0–3 h (up to the point of intersection of the two green straight trend lines in Figure 14, corresponding to 13 h 30 min).
