High calcium intake does not prevent stress-salt hypertension in dogs.
Avoidance conditioning sessions and isotonic saline (1.3 L/day) were administered to dogs for 12 days under conditions of a low (0.1%) or high (1.5%) calcium diet. Twenty-four-hour mean arterial pressure increased comparably during the stress-salt conditioning periods on both the low (systolic: +16 +/- 5 mm Hg; diastolic: +6 +/- 2 mm Hg) and high (systolic: +17 +/- 4 mm Hg; diastolic: +11 +/- 4 mm Hg) calcium diets. Urine volume, sodium excretion, and serum calcium levels on the high calcium diet were not significantly different from those on the low calcium diet. In a second experiment, calcium was infused continuously for six days into the arterial circulation of normotensive or stress-salt hypertensive dogs at a rate of 0.12-0.23 mEq/min. Although serum calcium levels increased by up to 50% under these conditions, there were no significant effects on 24-hour levels of arterial pressure. In contrast to the protective effect of augmented potassium intake, these findings indicate that calcium intake does not influence the development of stress-salt hypertension in dogs.
D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D002118:Calcium / Q000008:administration & dosage*; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006973:Hypertension / Q000209:etiology / Q000517:prevention & control*; D012965:Sodium Chloride / Q000009:adverse effects*; D013315:Stress, Psychological / Q000150:complications*
D012965:Sodium Chloride; D002118:Calcium