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  • Title: Short tertatolol treatment does not impair the hormone and metabolic responses to exercise and hypoglycemia in diabetics.
    Author: Lantz B, Paillard F, Nunez E, Assan R.
    Journal: Horm Metab Res; 1989 Oct; 21(10):561-5. PubMed ID: 2572524.
    Abstract:
    Beta-blockers can precipitate hypoglycemia and mask its warning signs. Ten male insulin-dependent, otherwise healthy diabetic patients underwent two submaximal exercise tests and two insulin-induced hypoglycemic events (0.2 u/Kg short-acting insulin IV) after six days administration of placebo followed by tertatolol, a non selective beta-blocker (5 mg once daily). Tertatolol modified neither the exercise-induced changes in blood glucose, lactate and plasma unesterified fatty acid levels, nor those of counter regulatory hormones (glucagon, growth hormone, cortisol), while blood pressure, heart rate and plasma renin activity were significantly reduced, proving that tertatolol had actually been ingested, and was active. During the insulin-induced hypoglycemia, similarly tertatolol did not modify the course of the plasma fuels and hormones. Particularly, hypoglycemia was neither deeper nor more prolonged in the presence than in the absence of tertatolol. Warning symptoms were not affected except for palpitations which were not perceived. These results suggest that tertatolol did not precipitate hypoglycemia following exercise, and did not aggravate insulin-induced hypoglycemia in short term administration, and in otherwise healthy diabetic patients.
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