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.
Relationships between Work Ability Index (WAI) and delta changes (Δ) from supine to 75° head-up tilt (HUT) for high frequency (HF) in normalized units (A), low frequency (LF) in normalized units (B), and LF/HF ratio (C) and between WAI and diastolic blood pressure (DBP) assessed during HUT (D).
