title: Associations between inflammatory markers, candidate polymorphisms and physical performance in older Danish twins.
abstract: Inflammation may play an essential role in the decline of physical performance. In this study we investigated the associations between inflammatory markers, candidate polymorphisms and physical performance in elderly people. Plasma levels of TNF-α, IL-6, CRP, fibrinogen, sICAM-1 and candidate polymorphisms were measured in 600 twin individuals aged 73 years and older participating in the Longitudinal Study of Aging Danish Twins. Physical performance was assessed using a self-reported measure. The inclusion of twins allowed both traditional and within-twin-pair analysis which permitted control for shared environment and genetic factors. Higher levels of inflammatory markers were generally associated with a lower level of physical performance. The TNFα-238G/A polymorphism was significantly associated with physical performance in men, with A allele carriers having significantly better performance than GG homozygotes. However, this gene variation seems to have only a minor role in explaining the associations between the levels of inflammatory markers and physical performance. When using twin pair analysis to test whether genetic factors in general account for this association, results showed that the association between the level of fibrinogen and physical performance could be caused by genetic factors. Also the association between the level of TNF-α and physical performance in males could be caused by genetic factors. However, other gene variations than the candidate gene polymorphisms studied here seem to explain the major part of the genetic proportion of this association.
authors.affiliation: School of Health Sciences, University of Tampere, FI-33014 Tampere, Finland. kristina.tiainen@uta.fi
authors.forename: Kristina
authors.initials: K
authors.lastname: Tiainen
authors.forename: Mikael
authors.initials: M
authors.lastname: Thinggaard
authors.forename: Marja
authors.initials: M
authors.lastname: Jylhä
authors.forename: Else
authors.initials: E
authors.lastname: Bladbjerg
authors.forename: Kaare
authors.initials: K
authors.lastname: Christensen
authors.forename: Lene
authors.initials: L
authors.lastname: Christiansen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000235:genetics* / Q000378:metabolism; D015415:Biomarkers / Q000378:metabolism*; D002097:C-Reactive Protein / Q000235:genetics / Q000378:metabolism; D005260:Female; D005340:Fibrinogen / Q000235:genetics / Q000378:metabolism; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D007249:Inflammation / Q000235:genetics* / Q000503:physiopathology; D018799:Intercellular Adhesion Molecule-1 / Q000235:genetics / Q000378:metabolism; D015850:Interleukin-6 / Q000235:genetics / Q000378:metabolism; D008297:Male; D053580:Muscle Strength / Q000235:genetics; D018482:Muscle, Skeletal / Q000502:physiology; D010809:Physical Fitness / Q000502:physiology*; D011110:Polymorphism, Genetic / Q000235:genetics*; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics / Q000378:metabolism
chemical_list: D015415:Biomarkers; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha; D018799:Intercellular Adhesion Molecule-1; D005340:Fibrinogen; D002097:C-Reactive Protein
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