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.
Dose–response relationship between training load and autonomic cardiac indexes. HF, High‐frequency; LF, Low‐frequency components of R‐R interval variability; LF/HF, Low‐ to High‐frequency ratio in R‐R interval variability; NU, normalized units. Entries represent mean values ± SEM for nine athletes.
