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Journal of Clinical Endocrinology & Metabolism, Vol 57, 1067-1069, Copyright © 1983 by Endocrine Society

ARTICLES

Effect of exercise on serum calcium and parathyroid hormone

NM Vora, SC Kukreja, PA York, EN Bowser, GK Hargis and GA Williams

Previous studies have suggested a role for adrenergic stimuli in the regulation of PTH secretion. In the present studies, we evaluated the effect of endogenous catecholamine stimulation (by treadmill exercise) on serum calcium (Ca) and immunoreactive PTH (iPTH) in six healthy volunteers. Blood was collected for serum total Ca, ionized Ca, iPTH, cAMP, epinephrine, and norepinephrine before, during, and after exercise. As expected, plasma cAMP and catecholamine levels increased significantly during the exercise. In addition, there was an increase in serum total and plasma ionized Ca. However, serum iPTH levels did not change significantly at any of the times tested during and after exercise. The lack of change in serum PTH despite an increase in plasma catecholamines may be explained by 1) an increase in plasma ionized Ca by a separate mechanism (such as metabolic acidosis), which blocked an increase in serum iPTH, or 2) insufficient increase in plasma catecholamines to stimulate PTH secretion.


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