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Relation between calcium absorption and serum calcitriol in normal men: evidence for age-related intestinal resistance to calcitriol

Objective : To obtain information on the causes of age-related bone loss in men and the concomitant decline in calcium absorption. Design : Cross-sectional study. Setting : Adelaide, South Australia, Australia. Subjects : A total of 95 healthy, Caucasian men (age range 27–87 y). Results : Calcium ab...

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Published in:European journal of clinical nutrition 2004-02, Vol.58 (2), p.264-269
Main Authors: Scopacasa, F, Wishart, J M, Horowitz, M, Morris, H A, Need, A G
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description Objective : To obtain information on the causes of age-related bone loss in men and the concomitant decline in calcium absorption. Design : Cross-sectional study. Setting : Adelaide, South Australia, Australia. Subjects : A total of 95 healthy, Caucasian men (age range 27–87 y). Results : Calcium absorption declined with age ( r =−0.46, P −0.21, P
doi_str_mv 10.1038/sj.ejcn.1601777
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Design : Cross-sectional study. Setting : Adelaide, South Australia, Australia. Subjects : A total of 95 healthy, Caucasian men (age range 27–87 y). Results : Calcium absorption declined with age ( r =−0.46, P &lt;0.0001), as did 24-h urine calcium, phosphate and creatinine ( r &gt;−0.21, P &lt;0.05 for all); serum calcitriol and 25 hydroxyvitamin D did not change with age. Calcium absorption was related to serum calcitriol ( r =0.20, P =0.05). An inverse relation between the residual deviations in calcium absorption, after allowing for its dependence on calcitriol, and age ( F =5.4, P &lt;0.005) was observed. The 24-h urinary calcium, phosphate and creatinine were all related to calcium absorption ( r &gt;0.41, P &lt;0.0001). Forearm bone density fell with age ( r =−0.45, P &lt;0.0001) but was not related to calcium absorption, or markers of bone turnover. Conclusions : In healthy Caucasian males (i) calcium absorption falls, but serum calcitriol does not change with age, (ii) the relation between calcium absorption and serum calcitriol changes with age, indicative of an intestinal resistance to calcitriol and (iii) calcium absorption is a significant determinant of 24-h urinary calcium excretion.</description><identifier>ISSN: 0954-3007</identifier><identifier>EISSN: 1476-5640</identifier><identifier>DOI: 10.1038/sj.ejcn.1601777</identifier><identifier>PMID: 14749746</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>25-Hydroxyvitamin D ; Absorptiometry, Photon ; Absorption ; Adult ; Age ; Age Factors ; Aged ; Aged, 80 and over ; Australia ; Biological and medical sciences ; Blood ; Bone Density ; Bone loss ; Bone turnover ; Bones ; Calcitriol ; Calcitriol - blood ; Calcium ; Calcium (urinary) ; Calcium - blood ; Calcium - pharmacokinetics ; Calcium - urine ; Calcium absorption ; Calcium phosphates ; Clinical Nutrition ; Comparative analysis ; Creatinine ; Creatinine - urine ; Cross-Sectional Studies ; Epidemiology ; Excretion ; Forearm ; Forearm - diagnostic imaging ; Humans ; Internal Medicine ; Intestinal Absorption ; Intestine ; Male ; Males ; Medical sciences ; Medicine ; Medicine &amp; Public Health ; Men ; Metabolic Diseases ; Metals (hemochromatosis...) ; Middle Aged ; original-communication ; Other metabolic disorders ; Phosphates - urine ; Public Health ; Radionuclide Imaging ; Studies ; White people</subject><ispartof>European journal of clinical nutrition, 2004-02, Vol.58 (2), p.264-269</ispartof><rights>Springer Nature Limited 2004</rights><rights>2004 INIST-CNRS</rights><rights>COPYRIGHT 2004 Nature Publishing Group</rights><rights>Copyright Macmillan Journals Ltd. 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Design : Cross-sectional study. Setting : Adelaide, South Australia, Australia. Subjects : A total of 95 healthy, Caucasian men (age range 27–87 y). Results : Calcium absorption declined with age ( r =−0.46, P &lt;0.0001), as did 24-h urine calcium, phosphate and creatinine ( r &gt;−0.21, P &lt;0.05 for all); serum calcitriol and 25 hydroxyvitamin D did not change with age. Calcium absorption was related to serum calcitriol ( r =0.20, P =0.05). An inverse relation between the residual deviations in calcium absorption, after allowing for its dependence on calcitriol, and age ( F =5.4, P &lt;0.005) was observed. The 24-h urinary calcium, phosphate and creatinine were all related to calcium absorption ( r &gt;0.41, P &lt;0.0001). Forearm bone density fell with age ( r =−0.45, P &lt;0.0001) but was not related to calcium absorption, or markers of bone turnover. Conclusions : In healthy Caucasian males (i) calcium absorption falls, but serum calcitriol does not change with age, (ii) the relation between calcium absorption and serum calcitriol changes with age, indicative of an intestinal resistance to calcitriol and (iii) calcium absorption is a significant determinant of 24-h urinary calcium excretion.</description><subject>25-Hydroxyvitamin D</subject><subject>Absorptiometry, Photon</subject><subject>Absorption</subject><subject>Adult</subject><subject>Age</subject><subject>Age Factors</subject><subject>Aged</subject><subject>Aged, 80 and over</subject><subject>Australia</subject><subject>Biological and medical sciences</subject><subject>Blood</subject><subject>Bone Density</subject><subject>Bone loss</subject><subject>Bone turnover</subject><subject>Bones</subject><subject>Calcitriol</subject><subject>Calcitriol - blood</subject><subject>Calcium</subject><subject>Calcium (urinary)</subject><subject>Calcium - blood</subject><subject>Calcium - pharmacokinetics</subject><subject>Calcium - urine</subject><subject>Calcium absorption</subject><subject>Calcium phosphates</subject><subject>Clinical Nutrition</subject><subject>Comparative analysis</subject><subject>Creatinine</subject><subject>Creatinine - urine</subject><subject>Cross-Sectional Studies</subject><subject>Epidemiology</subject><subject>Excretion</subject><subject>Forearm</subject><subject>Forearm - diagnostic imaging</subject><subject>Humans</subject><subject>Internal Medicine</subject><subject>Intestinal Absorption</subject><subject>Intestine</subject><subject>Male</subject><subject>Males</subject><subject>Medical sciences</subject><subject>Medicine</subject><subject>Medicine &amp; Public Health</subject><subject>Men</subject><subject>Metabolic Diseases</subject><subject>Metals (hemochromatosis...)</subject><subject>Middle Aged</subject><subject>original-communication</subject><subject>Other metabolic disorders</subject><subject>Phosphates - urine</subject><subject>Public Health</subject><subject>Radionuclide Imaging</subject><subject>Studies</subject><subject>White people</subject><issn>0954-3007</issn><issn>1476-5640</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><recordid>eNp90ktv1DAQAOAIgehSOHMCRUUtp2zt-BluVVUeUiUkBOfIcSZbrxx7sR0Qd344TjfSFtSiHCx5vhnbmSmKlxitMSLyPG7XsNVujTnCQohHxQpTwSvGKXpcrFDDaEUQEkfFsxi3COWgqJ8WR3mljaB8Vfz-AlYl413ZQfoJ4EqtrDbTWKou-rC7DSnXlxFC3rwNpmC8LY0rnQ-jsuUI7l0JP0wPTkM5-FCqDVRhLgx9dgliMi7DANHEpGaV_J1az4sng7IRXizrcfHt_dXXy4_V9ecPny4vrivNJE4V8BprWjedGAZNFO8YQUTIoadSIE2JGHrRkaHHdU-oYkx3tEYSdarHsqZKkuPibF93F_z3Kd-qHU3UYK1y4KfYSoRriuUM3_4XCkZlIzGnWb75R279FPJjY1tzWot8QY6zOnlQ4Ybn5hGWUbVHG2WhNW7wKSi9AQdBWe9gMHn7AjdMMNzUdfbre3z-ehiNvjfh7E7CDSibbqK309zj-Dc830MdfIwBhnYXzKjCrxajdp67Nm7bee7aZe5yxuvlgVM3Qn_wy6BlcLoAFXPjh5CnwMSDY1yQhs-F0N7FHHIbCIc_9fDZr_YpTqUpwKHmEv8D9x_6mw</recordid><startdate>20040201</startdate><enddate>20040201</enddate><creator>Scopacasa, F</creator><creator>Wishart, J M</creator><creator>Horowitz, M</creator><creator>Morris, H A</creator><creator>Need, A G</creator><general>Nature Publishing Group UK</general><general>Nature Publishing</general><general>Nature Publishing Group</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7QP</scope><scope>7RV</scope><scope>7TK</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>8G5</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AN0</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>KB0</scope><scope>LK8</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M2O</scope><scope>M7P</scope><scope>MBDVC</scope><scope>NAPCQ</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope><scope>7X8</scope></search><sort><creationdate>20040201</creationdate><title>Relation between calcium absorption and serum calcitriol in normal men: evidence for age-related intestinal resistance to calcitriol</title><author>Scopacasa, F ; 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Design : Cross-sectional study. Setting : Adelaide, South Australia, Australia. Subjects : A total of 95 healthy, Caucasian men (age range 27–87 y). Results : Calcium absorption declined with age ( r =−0.46, P &lt;0.0001), as did 24-h urine calcium, phosphate and creatinine ( r &gt;−0.21, P &lt;0.05 for all); serum calcitriol and 25 hydroxyvitamin D did not change with age. Calcium absorption was related to serum calcitriol ( r =0.20, P =0.05). An inverse relation between the residual deviations in calcium absorption, after allowing for its dependence on calcitriol, and age ( F =5.4, P &lt;0.005) was observed. The 24-h urinary calcium, phosphate and creatinine were all related to calcium absorption ( r &gt;0.41, P &lt;0.0001). Forearm bone density fell with age ( r =−0.45, P &lt;0.0001) but was not related to calcium absorption, or markers of bone turnover. Conclusions : In healthy Caucasian males (i) calcium absorption falls, but serum calcitriol does not change with age, (ii) the relation between calcium absorption and serum calcitriol changes with age, indicative of an intestinal resistance to calcitriol and (iii) calcium absorption is a significant determinant of 24-h urinary calcium excretion.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>14749746</pmid><doi>10.1038/sj.ejcn.1601777</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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subjects 25-Hydroxyvitamin D
Absorptiometry, Photon
Absorption
Adult
Age
Age Factors
Aged
Aged, 80 and over
Australia
Biological and medical sciences
Blood
Bone Density
Bone loss
Bone turnover
Bones
Calcitriol
Calcitriol - blood
Calcium
Calcium (urinary)
Calcium - blood
Calcium - pharmacokinetics
Calcium - urine
Calcium absorption
Calcium phosphates
Clinical Nutrition
Comparative analysis
Creatinine
Creatinine - urine
Cross-Sectional Studies
Epidemiology
Excretion
Forearm
Forearm - diagnostic imaging
Humans
Internal Medicine
Intestinal Absorption
Intestine
Male
Males
Medical sciences
Medicine
Medicine & Public Health
Men
Metabolic Diseases
Metals (hemochromatosis...)
Middle Aged
original-communication
Other metabolic disorders
Phosphates - urine
Public Health
Radionuclide Imaging
Studies
White people
title Relation between calcium absorption and serum calcitriol in normal men: evidence for age-related intestinal resistance to calcitriol
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