Figure 1.
Effect of gestational age on HRV parameters in quiet sleep in the supine (A–D) and prone (E–H) positions. Values are mean ± SEM. *P < 0.05, **P < 0.01. HF, high frequency; HRV, heart rate variability; LF, low frequency.
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.