Rudnicki M, Thode J, Jørgensen T, Heitmann BL, Sørensen OH. Effects of age, sex, season and diet on serum ionized calcium, parathyroid hormone and vitamin D in a random population.
J Intern Med 1993;
234:195-200. [PMID:
8340743 DOI:
10.1111/j.1365-2796.1993.tb00730.x]
[Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
OBJECTIVES
To study the influence of age, sex, season and diet on calcium status in normal subjects.
DESIGN
A random population study. Setting. Institutional clinic for large population studies.
SUBJECTS
The subjects were drawn randomly from the Danish Civil Registration System and represented a random sample of the background population in the area. The sample comprised 127 subjects (54 men and 73 women, aged 35-65 years).
MAIN OUTCOME MEASURES
The effects of age, sex, season and diet on parathyroid hormone (PTH),1,25-dihydroxyvitamin D (1,25(OH)2D) and 25-hydroxyvitamin D (25-OHD).
RESULTS
There was no statistical significant difference for the serum concentrations of ionized calcium, PTH, 1,25(OH)2D and 25-OHD between the two sexes, nor any influence by age in either sex, in contrast to serum phosphate, which declined significantly in men (P < 0.05), but tended to increase in women. Serum PTH (P < 0.009) showed seasonal fluctuations, whereas serum concentrations of 1,25(OH)2D, 25-OHD, ionized calcium, phosphate and magnesium remained stable throughout the year. Dietary intake of calcium and vitamin D were not related to any serum variables.
CONCLUSIONS
In healthy subjects differences between the two sexes exist regarding phosphate metabolism. Serum PTH shows seasonal fluctuations.
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