Acute effects in healthy women of oral calcium on the calcium-parathyroid axis and bone resorption as assessed by serum beta-CrossLaps
| Autor: | V. Zikán, T. Haas, Jan J. Stepan |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Acute effects
Adult medicine.medical_specialty Endocrinology Diabetes and Metabolism Urinary system chemistry.chemical_element Administration Oral Urine Calcium Bone resorption Collagen Type I chemistry.chemical_compound Endocrinology Bone Density Internal medicine Statistical significance medicine Humans Orthopedics and Sports Medicine Oral calcium Bone Resorption Aged Creatinine Lumbar Vertebrae Dose-Response Relationship Drug business.industry Femur Neck Middle Aged Circadian Rhythm Postmenopause Radiography chemistry Parathyroid Hormone Female Collagen business Peptides Biomarkers |
| Zdroj: | Calcified tissue international. 68(6) |
| ISSN: | 0171-967X |
| Popis: | The purpose of this investigation was to test the hypothesis that the decrease in bone resorption after the calcium (Ca) load can be assessed by serum type 1 collagen cross-linked C-telopeptide (Elecsys beta-CrossLaps, Roche) (S-CTX). Six young healthy women (23-27 years of age) and six healthy late postmenopausal women (63-69 years of age) with normal bone mineral density (BMD) received, after overnight fasting, 1 g of elemental Ca (in the form of calcium carbonate) dissolved in 250 ml of water or only plain water (fasting period). In addition, the late postmenopausal women were tested with an additional dose of 0.2 g of elemental Ca in 250 ml of water. Serum ionized Ca (S-iCa), S-CTX, plasma immunoreactive intact parathormone (P-PTH) were measured before and during the 5 hours after the oral intake of Ca. Urine was collected at regular intervals, and urinary Ca and creatinine were analyzed. In both the young and late postmenopausal subjects, the load with Ca resulted in a significant increase in S-iCa and urine Ca/creatinine ratio as well and a significant decrease of P-PTH and S-CTX compared with the fasting period. The comparison of the effects of 1 g Ca load between young and late postmenopausal women did not show any statistical significance in any measured parameters. In the late postmenopausal women, a significantly greater increase in S-iCa concentrations and a significantly greater decrease in P-PTH after 1 g were observed compared with those after a 0.2 g dose of Ca. During the first 3 hours, the load of both 1 g and 0.2 g of Ca induced a similar decrease in S-CTX. After 5 hours, however, S-CTX were significantly more suppressed after a 1 g dose than after a 0.2 g dose of Ca. In conclusion, a single oral morning dose of 1 g Ca suppresses bone resorption, as assessed by S-CTX, to a similar degree in both young and late postmenopausal women with normal Ca absorption. In healthy late postmenopausal women the load of 0.2 g of Ca carbonate significantly suppresses bone resorption. |
| Databáze: | OpenAIRE |
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