A double-blind study comparing the effect of zolpidem 10 mg, and placebo, on sleep architecture, nocturnal ventilation, cardiovascular parameters (heart rate, systolic, diastolic and mean blood pressures) was carried out. Ten healthy middle-aged males took part in the study. No significant differences were found between zolpidem and placebo in relation to sleep architecture. Mean respiratory disturbance index (RDI) and SaO2 values (mean SaO2, time spent with SaO2 < 90%) were similar under both conditions. The diastolic and mean blood pressure readings taken from REM periods which occurred during the first third of the night were significantly higher with zolpidem. No changes in systolic blood pressure or heart rate were found with zolpidem in comparison to placebo.
The present study was performed to document factors playing a role in the age-related increase of serum total cholesterol, triglycerides, and phospholipids in male WISTAR rats. In 59 and 122 week old rats, serum concentrations of all three parameters were significantly higher than those determined in younger rats (15-17 weeks of age). Serum triglycerides and cholesterol concentrations were higher in post absorptive than in fasting state. In mature rats of same age (59 weeks), mean concentrations of cholesterol, triglycerides, and phospholipids were significantly higher in the heavier animals than in the others. A strong correlation could be established between body weight and serum cholesterol or triglycerides of these animals. The composition of diet appears to play a role in serum cholesterol concentration but not in serum triglycerides concentration in old rats (59-65 weeks of age). This effect is demonstrated even if daily caloric intake and daily body weight gain of old rats (40-50 weeks of age) were not significantly different with both diets tested (2900 and 3250 cal/kg). In conclusion old Wistar rats develop increased concentrations of serum lipids parameters.
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