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.
Heart rate (bpm) and electromechanical delay (ms). Left panel: Heart rate in each decade for awake and sleep. *P value <0.05 for awake vs sleep within 1 decade. Right panel: Electromechanical delay (EMAT = QS1, time interval from onset of Q wave to mitral valve component of S1). Abbreviations: EMAT, electrical mechanical activation time; S1, first heart sound.
