Heart rate changes.

Abstract

<p>Nighttime (NT) and daylight (DL) heart rate measured in standard cages (BL) and during 14 days (d1–d14) for control (<b>A</b>), isolated-control (<b>B</b>), isolated (<b>C</b>), attached (<b>D</b>), and unloaded (<b>E</b>) rats. Data are given as a mean ± SEM. *- P < 0.05 <i>versus</i> basal level (BL).</p