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PROLONGED LOW‐INTENSITY EXERCISE RAISES THE SERUM PARATHYROID HORMONE LEVELS
Author(s) -
LJUNGHALL S.,
JOBORN H.,
ROXIN L.E.,
RASTAD J.,
WIDE L.,
ÅKERSTRÖM G.
Publication year - 1986
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/j.1365-2265.1986.tb03606.x
Subject(s) - medicine , endocrinology , parathyroid hormone , hypocalcaemia , calcium , calcium metabolism , chemistry , physical exercise
SUMMARY Twelve healthy males performed 5 h exercise on a bicycle ergometer at a constant work load of approximately 50% of their maximum capacity. The serum concentrations of parathyroid hormone (PTH) increased after the first hour and were continuously elevated throughout the exercise period. The rise in PTH was 5–7% above pre‐exercise levels, corresponding to 20–30% of the maximal increase obtained by the same assay during prolonged hypocalcaemia. The probable cause for the rise in PTH was that the plasma ionized calcium tended to be lowered during exercise. Since the total serum calcium concentrations were raised (by 3–5%) during exercise the reduction of the free, ionized, fraction was presumably largely due to increased complex‐binding although an outward transport from plasma was not excluded. The serum concentrations of magnesium were gradually reduced during exercise while those of phosphate and potassium were raised throughout, probably as a result of leakage from the working muscle.