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          <titl xml:lang="sv">Maximal benmassa hos unga kvinnor: baslinjeundersökning</titl>
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          <producer xml:lang="en" abbr="SND">Swedish National Data Service</producer><producer xml:lang="sv" abbr="SND">Svensk nationell datatjänst</producer>
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        <titl xml:lang="sv">Maximal benmassa hos unga kvinnor: baslinjeundersökning</titl>
        <parTitl xml:lang="en">The PEAK-25 cohort: baseline</parTitl>
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        <AuthEnty affiliation="Department of Clinical Sciences, Lund university" xml:lang="en">Åkesson, Kristina
        </AuthEnty><AuthEnty affiliation="Institutionen för kliniska vetenskaper, Lunds universitet" xml:lang="sv">Åkesson, Kristina
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        <distDate xml:lang="en" date="2017-03-02">2017-03-02</distDate>
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      <abstract xml:lang="en">The PEAK25-cohort, women 25 yrs at inclusion, addresses factors contributing to peak bone mass. In 2014 the PEAK25 cohort is still unique since there are no cohorts nationally or internationally which have been specifically designed to identify genetic and other risk factors for bone strength at this critical age or which has been followed longitudinally. By investigating 10yr change in BMD we have the potential to identify genes important for bone homeostasis, without confounding from perimenopausal hormonal changes. Parents and grand-parents have also been collected. This cohort is an important resource in terms of providing normative data for young Swedish women, providing reference data for future studies in women and investigating long-term changes in risk factors in pre-menopausal women.  In PEAK-25, a total of 1,061 (response rate 49 %) underwent baseline investigation (1999-2004). Enrollment was continuous throughout the year to avoid seasonal bias.  All women were 25 years old at inclusion. Exclusion criteria was pregnancy at the time of the baseline investigation or during the 12 months prior to inclusion. The cohort was followed up at 10-years.  The investigations included bone mineral density (BMD) and body composition measurements, anthropometrics and BioDex isokinetic muscle force. Questionnaires provide information on lifestyle, recreational physical activity, health, food/nutrition, birthweight and hormonal function. Validated instruments for outcome (SF-36, EQ5D and Qualeffo-radius), ADL-function are also available. Information on fractures sustained prior to baseline and during followup were collected. Blood and urine samples were collected.  Extensive phenotyping includes: bone turnover markers and a number of serum markers GWAS genotyping will be available in Spring 2017 (Illumina GSA Arrays “Infinium iSelect 24x1 HTS Custom Beadchip Kit”).  Purpose:  This cohort was designed to include women at an age closely representing ‘pure’ peak bone mass, prior to any major perturbations from external or internal factors causing loss of bone. Essentially it is a period of intact coupling between bone formation and resorption. The aim of the study was identification of gene variants and other associated risk factors for osteoporosis on the attainment of peak bone mass.</abstract><abstract xml:lang="sv">PEAK25-kohorten, som vid dess start inkluderar kvinnor som är 25 år, studerar faktorer som bidrar till maximal benmassa. Fortfarande, år 2014, är PEAK25 kohorten unikt eftersom det inte finns några nationella eller internationella kohorter som är särskilt utformade för att identifiera genetiska och andra riskfaktorer för benstyrkan vid denna kritiska ålder eller som har följts longitudinellt.   Genom att undersöka 10 års förändring i BMD har vi möjlighet att identifiera gener som är viktiga för benhomeostas, utan confounders från hormonella förändringar under perimenopaus. Data från föräldrar och mor- och farföräldrar har också samlats in. Denna kohort är en viktig resurs när det gäller att tillhandahålla normativa uppgifter för unga svenska kvinnor, vilket ger referensdata för framtida studier hos kvinnor och undersöka långsiktiga förändringar i riskfaktorer hos premenopausala kvinnor.  I PEAK-25 har totalt 1061 individer (motsvarande en svarsfrekvens på 49 %) genomgått baslinjeundersökningen (mellan åren 1999-2004). Inskrivning var fortlöpande under året för att undvika säsongsbias. Alla kvinnor var 25 år vid studiens start. Exklusionskriterier var graviditet vid tidpunkten för baslinjeundersökningen eller under de 12 föregående månaderna. Kohorten följdes upp vid 10-år.  Undersökningarna innefattade mätning av bentäthet (BMD) och kroppssammansättning, antropometriska mått och isokinetisk dynamometri (Biodex). Frågeformulär ger information om livsstil, hälsa, mat/nutrition och hormonell funktion. Validerade instrument för utfall (SF-36, EQ5D och Qualeffo-radius), ADL-funktion och mental status används också. Information om vuxnas frakturer, som var ihållande före inkludering i studien samlades och information om nya frakturer registrerades kontinuerligt fram till oktober 2012 (~ 15 år) genom röntgenfiler på röntgenavdelningen, Malmö, Skånes universitetssjukhus. Blod- och urinprover samlades även in.  Omfattande fenotypning, som inkluderar benomsättningsmarkörer och ett antal serummarkörer GWAS genotypning, kommer att finnas tillgängliga under våren 2017 Illumina GSA Arrays “Infinium iSelect 24x1 HTS Custom Beadchip Kit”).  Syfte:  Kohorten har utformats för att inkludera kvinnor i en ålder som representerar "ren" maximal benmassa, innan några större störningar från externa eller interna faktorer som orsakar förlust av benmassa. I huvudsak är det en period av intakt koppling mellan benbildning och benresorption. Syftet med studien var att identifiera genvarianter och andra riskfaktorer för osteoporos vid tidpunkten för maximal benmassa.</abstract>
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