{"id":6292,"date":"2026-10-19T09:48:44","date_gmt":"2026-10-19T09:48:44","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-heilbrigdisvisindum-sigrun-sunna-skuladottir\/"},"modified":"2026-10-19T09:48:44","modified_gmt":"2026-10-19T09:48:44","slug":"doktorsvorn-i-heilbrigdisvisindum-sigrun-sunna-skuladottir","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-heilbrigdisvisindum-sigrun-sunna-skuladottir\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed heilbrig\u00f0isv\u00edsindum – Sigr\u00fan Sunna Sk\u00falad\u00f3ttir"},"content":{"rendered":"
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Fimmtudaginn 30. j\u00fan\u00ed ver Sigr\u00fan Sunna Sk\u00falad\u00f3ttir doktorsritger\u00f0 s\u00edna \u00ed heilbrig\u00f0isv\u00edsindum vi\u00f0 Matv\u00e6la- og n\u00e6ringarfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands. Ritger\u00f0in ber heiti\u00f0: Einkenni mja\u00f0marbrotah\u00f3ps me\u00f0al eldri einstaklinga \u00ed sj\u00e1lfst\u00e6\u00f0ri b\u00fasetu. Characteristics of hip fracture cases among community-dwelling Icelandic older adults.<\/strong><\/p>\n

Andm\u00e6lendur eru dr. Timo Strandberg, pr\u00f3fessor vi\u00f0 h\u00e1sk\u00f3lann \u00ed Oulu, Finnlandi, og dr. Sigr\u00ed\u00f0ur L\u00e1ra Gu\u00f0mundsd\u00f3ttir, pr\u00f3fessor vi\u00f0 Menntav\u00edsindasvi\u00f0 H\u00e1sk\u00f3la \u00cdslands.<\/p>\n

Lei\u00f0beinendur voru dr. \u00de\u00f3rhallur Ingi Halld\u00f3rsson, pr\u00f3fessor og dr. Alfons Ramel, pr\u00f3fessor. Auk \u00feeirra s\u00e1tu \u00ed doktorsnefnd Gunnar Sigur\u00f0sson, pr\u00f3fessor emeritus, Laufey Steingr\u00edmsd\u00f3ttir, pr\u00f3fessor emerita, Vilmundur Gu\u00f0nason forst\u00f6\u00f0ul\u00e6knir og Ingibj\u00f6rg Hjaltad\u00f3ttir, pr\u00f3fessor.<\/p>\n

\u00d3l\u00f6f Gu\u00f0n\u00fd Geirsd\u00f3ttir, d\u00f3sent og varadeildarforseti Matv\u00e6la- og n\u00e6ringarfr\u00e6\u00f0ideildar, stj\u00f3rnar ath\u00f6fninni sem fer fram \u00ed H\u00e1t\u00ed\u00f0asal H\u00e1sk\u00f3la \u00cdslands og hefst kl. 13.00.<\/p>\n

V\u00f6rninni ver\u00f0ur streymt:\u00a0https:\/\/livestream.com\/hi\/doktorsviornsigrunsunnaskuladottir<\/a><\/p>\n

\u00c1grip<\/strong><\/p>\n

Mja\u00f0marbrot geta fali\u00f0 \u00ed s\u00e9r verulega sker\u00f0ingu \u00e1 heilsu og l\u00edfsg\u00e6\u00f0um. Orsaka\u00fe\u00e6ttir eru me\u00f0al annars auki\u00f0 tap \u00e1 beinmassa, hreyfif\u00e6rni og v\u00f6\u00f0vamassa me\u00f0 h\u00e6kkandi aldri. \u00c1hrifa\u00fe\u00e6ttir geta veri\u00f0 \u00a0tengsl D-v\u00edtam\u00edns vi\u00f0 bein\u00fe\u00e9ttni, sem og tengsl hreyfigetu vi\u00f0 mja\u00f0marbrot.<\/p>\n

Markmi\u00f0 verkefnis var a\u00f0 kortleggja hva\u00f0 einkennir aldra\u00f0a einstaklinga sem mja\u00f0marbrotna fr\u00e1 \u00feeim sem brotna ekki, \u00far g\u00f6gnum \u00d6ldrunarranns\u00f3knar Hjartaverndar (AGES-Reykjav\u00edk).<\/p>\n

Ni\u00f0urst\u00f6\u00f0ur \u00far grein 1: \u00dea\u00f0 sem einkenndi karlmenn sem brotnu\u00f0u mi\u00f0a\u00f0 vi\u00f0 \u00fe\u00e1 sem brotnu\u00f0u ekki, var markt\u00e6k skert hreyfigeta vi\u00f0 upphaf ranns\u00f3knar, jafnvel eftir lei\u00f0r\u00e9ttingu fyrir b\u00e6\u00f0i aldri og bein\u00fe\u00e9ttni. \u00dea\u00f0 sem einkennir konur sem mja\u00f0marbrotna mi\u00f0a\u00f0 vi\u00f0 \u00fe\u00e6r sem brotnu\u00f0u ekki, var markt\u00e6kt l\u00e6gri l\u00edkams\u00feyngdarstu\u00f0ull og minni fitu- og v\u00f6\u00f0vamassi. Beinstyrkur sem og styrkur D-v\u00edtam\u00edns \u00ed bl\u00f3\u00f0i (serum 25(OH)D) var markt\u00e6kt l\u00e6gri (~5 nmol\/L) vi\u00f0 upphaf ranns\u00f3knar hj\u00e1 b\u00e1\u00f0um kynjum sem brotnu\u00f0u.<\/p>\n

Grein 2: \u00d3fulln\u00e6gjandi D-v\u00edtam\u00ednhagur \u00ed bl\u00f3\u00f0i vi\u00f0 upphaf ranns\u00f3knar (<30 nm\u00f3l\/L) bori\u00f0 saman vi\u00f0 fulln\u00e6gjandi hag (\u226550 nm\u00f3l\/L) tengdist l\u00e6gri bein\u00fe\u00e9ttni \u00ed l\u00e6rleggsh\u00e1lsi (femoral neck) hj\u00e1 b\u00e6\u00f0i k\u00f6rlum og konum \u00f3h\u00e1\u00f0 aldri og l\u00edkams\u00feyngdarstu\u00f0li. Verri D-v\u00edtam\u00ednhagur var einnig tengdur auknum l\u00edkum \u00e1 mja\u00f0marbrotum. Eftir lei\u00f0r\u00e9ttingu fyrir bein\u00fe\u00e9ttni og hreyfigetu hurfu \u00feessi tengsl hj\u00e1 k\u00f6rlum en ekki konum, \u00fev\u00ed g\u00e6ti l\u00e6gri beinmassi hj\u00e1 konum tengdur minna r\u00famm\u00e1li beina \u00fatsk\u00fdrt a\u00f0 hluta af hverju hreyfigeta og bein\u00fe\u00e9ttni haf\u00f0i minna v\u00e6gi hj\u00e1 konum en k\u00f6rlum.<\/p>\n

Grein 3: \u00deeir sem neyttu minna en helmings af r\u00e1\u00f0l\u00f6g\u00f0um dagskammti (einn skammtur ~250 mL) af mj\u00f3lk e\u00f0a s\u00fdr\u00f0um mj\u00f3lkurv\u00f6rum \u00e1 dag voru \u00ed meiri \u00e1h\u00e6ttu \u00e1 mja\u00f0marbrotum mi\u00f0a\u00f0 vi\u00f0 \u00fe\u00e1 sem bor\u00f0u\u00f0u tvo e\u00f0a fleiri skammta \u00e1 dag, sem er s\u00e1 skammtur sem opinberar r\u00e1\u00f0leggingar leggja til var\u00f0andi mj\u00f3lkurneyslu.<\/p>\n

\u00c1lyktanir: Mikilv\u00e6gt er a\u00f0 eldri einstaklingar \u00e1tti sig \u00e1 \u00e1hrifum sem l\u00e1g bein\u00fe\u00e9ttni, skortur \u00e1 D-v\u00edtam\u00edni \u00ed bl\u00f3\u00f0i og mj\u00f3lkurneyslu undir r\u00e1\u00f0leggingum (\u22652 skammtar \u00e1 dag) getur haft \u00e1 aukna \u00e1h\u00e6ttu \u00e1 mja\u00f0mabrotum hj\u00e1 b\u00e1\u00f0um kynjum.<\/p>\n

English abstract<\/strong><\/p>\n

Hip fractures in older adults are strongly associated with reduced health and quality of life. Loss of bone mass, physical function and muscle mass are thought to be main causes of hip fractures at older age. Associations between vitamin D status and bone mineral density (BMD) as hip-fractures and physical function may also be influensing factors.<\/p>\n

The aims was to characterize differences between older adults that experience hip fractures compared to those who did not, from AGES-Reykjavik study.<\/p>\n

Results: In paper I. Males that experienced hip fractures had significantly poorer measures of physical function, at baseline compared to males that did not experience hip fracturs after age and vBMD adjustment. For female hip fracture cases had lower body mass index, fat- and fat free mass compared to those that did not experience hip fractures after age and vBMD adjustment. However, similarities between both sexes included lower vitamin D status (~5 nmol\/L lower concentration of serum 25(OH)D), and lower vBMD among hip fracture cases compared to non-cases.<\/p>\n

In paper II was deficient (serum 25(OH)D concentrations <30 nmol\/L) compared to sufficient status (\u226550 nmol\/L) vitamin D was associated with lower vBMD of the femoral neck at baseline in both males and females. Deficient versus sufficient vitamin D status was also significantly associated with higher risk of incident hip fractures. After further adjustment for vBMD and measures of physical function the association became non-significant for males but remained significant for females this suggested that sex specific differences might relate to lower bone mass among females due to smaller bone volume that made the adjustment of vBMD and physical function less influential for females.<\/p>\n

In the third and final participants who consumed less than half a potion of milk products per day (one portion ~250 mL) had significantly higher risk of incident hip fractures compared to those consuming \u22652 portions per day, which is the amount that official dietary recommendations advocate.<\/p>\n

Conclusions: It is important to inform older adults on Sex specific differences were observed between hip fracture cases and non-cases.. Vitamin D status and consumption of milk and cultured milk products showed a relativey strong and protective association with incendent hip fracturs.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Sigr\u00fan Sunna Sk\u00falad\u00f3ttir er f\u00e6dd \u00e1ri\u00f0 1975 \u00e1 Selfossi.\u00a0 H\u00fan \u00fatskrifa\u00f0ist sem sj\u00fakrali\u00f0i \u00e1ri\u00f0 1996 fr\u00e1 Fj\u00f6lbrautask\u00f3la Su\u00f0urlands,\u00a0 lauk st\u00fadentspr\u00f3fi fr\u00e1 sama sk\u00f3la \u00e1ri\u00f0 2002. Sigr\u00fan Sunna lauk BS-gr\u00e1\u00f0u \u00ed hj\u00fakrunarfr\u00e6\u00f0i \u00e1ri\u00f0 2008 og MS-gr\u00e1\u00f0u, me\u00f0 \u00e1herslu \u00e1 br\u00e1\u00f0ahj\u00fakrun, fr\u00e1 Hj\u00fakrunarfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2014.\u00a0 Me\u00f0fram doktorsn\u00e1minu hefur h\u00fan sinnt b\u00e6\u00f0i lei\u00f0beiningu BS-nemenda og veri\u00f0 \u00ed a\u00f0junktst\u00f6\u00f0u vi\u00f0 Hj\u00fakrunarfr\u00e6\u00f0ideild. Einnig hefur h\u00fan sinnt stundakennslu vi\u00f0 Matv\u00e6la- og n\u00e6ringarfr\u00e6\u00f0ideild. Foreldrar Sigr\u00fanar Sunnu voru Sk\u00fali B. \u00c1g\u00fastsson og \u00d3l\u00edna M. Steingr\u00edmsd\u00f3ttir, eiginma\u00f0ur hennar er Halld\u00f3r Gunnarsson, synir Sigr\u00fanar eru Arnar J\u00f6kull og \u00der\u00f6stur Steinn, og stj\u00fapb\u00f6rn hennar eru Brynjar Logi, H\u00f3lmfr\u00ed\u00f0ur \u00c1sta og H\u00f6skuldur M\u00e1ni.<\/p>\n<\/div><\/div>","protected":false},"featured_media":5152,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2022-06-30T13:00:00+00:00","_phd_date_end":"2022-06-30T16:00:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0asalur","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Einkenni mja\u00f0marbrotah\u00f3ps me\u00f0al eldri einstaklinga \u00ed sj\u00e1lfst\u00e6\u00f0ri b\u00fasetu. 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