Blood magnesium and potassium alterations with maximal treadmill exercise testing: effects of beta-adrenergic blockade.

Abstract:

:To test alterations in plasma potassium and magnesium levels with maximal exercise, 15 sedentary, healthy men (mean age 29 years) participated in a double-blind crossover study for 11 weeks with propranolol, atenolol, and placebo. Maximal exercise tests were done at baseline and after placebo and beta-blockade phases. Blood for analysis was collected via indwelling brachial vein angiocatheters at baseline and during and after testing. Plasma potassium and magnesium levels increased at peak exercise with atenolol, propranolol, and placebo. There was no difference among groups in baseline recovery for magnesium (mean 28 minutes, range 24 to 30 minutes). Potassium levels returned to baseline more rapidly (compared with magnesium) in the placebo and atenolol groups (mean 10 minutes); however, recovery time was prolonged with propranolol (26 minutes) compared with placebo and atenolol (p less than 0.01). In conclusion, plasma magnesium and potassium levels increased significantly with maximal exercise and are unaffected by atenolol or propranolol beta-blockade. Propranolol, however (compared with atenolol and placebo), prolongs the time of return to baseline of plasma potassium after exercise.

journal_name

Am Heart J

journal_title

American heart journal

authors

Fletcher GF,Sweeney ME,Fletcher BJ

doi

10.1016/0002-8703(91)90962-h

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

105-10

issue

1 Pt 1

eissn

0002-8703

issn

1097-6744

pii

0002-8703(91)90962-H

journal_volume

121

pub_type

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