Figure 3.

Diurnal changes in the blood plasma lipid concentrations in the arterial blood of adult male Sprague–Dawley rats fed normal chow ad libitum. Animals were subjected to dark-phase lighting cycles (as described in the legend to Figure 1) from 1800 to 0600 (indicated by dark bars). Total fatty acid values (μg/mL plasma; mean ± 1 SD; n = 6 per group) for groups 1 through 4 (closed circles), 5 (triangles), and 6 (constant bright light; open circles) were the sums of myristic, palmitic, palmitoleic, stearic, oleic, linoleic, and arachidonic acids in the different lipid classes of (A) triglycerides, (B) free fatty acids, (C) phospholipids, and (D) cholesterol esters collected at the various time points. Data are plotted twice. Concentrations without asterisks are different (P < 0.05) from concentrations with asterisks.