@article{SpiraBuchmannKoenigetal.2019,
  author    = {Spira, Dominik and Buchmann, Nikolaus and Koenig, Maximilian and Rosada, Adrian and Steinhagen-Thiessen, Elisabeth and Demuth, Ilja and Norman, Kristina},
  title     = {Sex-specific differences in the association of vitamin D with low lean mass and frailty},
  series = {Nutrition},
  volume    = {62},
  journal   = {Nutrition},
  publisher = {Elsevier},
  address   = {New York},
  issn      = {0899-9007},
  doi       = {10.1016/j.nut.2018.11.020},
  pages     = {1 -- 6},
  year      = {2019},
  abstract  = {Background: Sex-specific differences in factors associated with aging and lifespan, such as sarcopenia and disease development, are increasingly recognized. The study aims to assess sex-specific aspects of the association between vitamin D insufficiency and low lean mass as well as between vitamin D insufficiency and the frailty phenotype. Methods: A total of 1102 participants (51\% women) from the Berlin Aging Study II were included in this cross-sectional study. Vitamin D insufficiency was defined as a 25(OH)D level <50 nmol/L. Lean mass was assessed with dual-energy x-ray absorptiometry and corrected by body mass index. Low lean mass was defined according to the Foundations for the National Institutes of Health Sarcopenia Project criteria (appendicular lean mass/body mass index <0.789 in men and <0.512 in women) and frailty defined according to the Fried criteria. Results: In a risk factor adjusted analysis, the association of vitamin D insufficiency was significantly influenced by sex (P for interaction < 0.001). Men with vitamin D insufficiency had 1.8 times higher odds of having low lean mass, with no association between vitamin D insufficiency and low lean mass in women. Participants with vitamin D insufficiency had 1.5 higher odds of being prefrail/frail with no significant effect modification by sex. Conclusions: We found notable sex-specific differences in the association of vitamin D insufficiency with low lean mass but not of vitamin D insufficiency with frailty. Vitamin D might play a relevant role in the loss of lean mass in men but not women and might be a biological marker of an unfavorable aging process associated with early development of frailty regardless of sex.},
  language  = {en}
}
@article{BuchmannFielitzSpiraetal.2022,
  author    = {Buchmann, Nikolaus and Fielitz, Jens and Spira, Dominik and K{\"o}nig, Maximilian and Norman, Kristina and Pawelec, Graham and Goldeck, David and Demuth, Ilja and Steinhagen-Thiessen, Elisabeth},
  title     = {Muscle mass and inflammation in older adults: impact of the metabolic syndrome},
  series = {Gerontology},
  volume    = {68},
  journal   = {Gerontology},
  number    = {9},
  publisher = {Karger},
  address   = {Basel},
  issn      = {0304-324X},
  doi       = {10.1159/000520096},
  pages     = {989 -- 998},
  year      = {2022},
  abstract  = {Background: Inflammatory processes are a cause of accelerated loss of muscle mass. Metabolic syndrome (MetS) is a highly prevalent age-related condition, which may promote and be promoted by inflammation. However, whether inflammation in MetS (metaflammation) is associated with lower muscle mass is still unclear. Methods: Complete cross-sectional data on body composition, MetS, and the inflammatory markers interleukin (IL)-1 beta, IL-6, IL-10, tumor necrosis factor (TNF), and C-reactive protein (CRP) were available for 1,377 BASE-II participants (51.1\% women; 68 +/- 4 years old). Appendicular lean mass (ALM) was assessed by dual-energy X-ray absorptiometry. Low muscle mass (low ALM-to-BMI ratio [ALMBMI]) was defined according to the Foundation for the National Institutes of Health (FNIH) Sarcopenia Project. Regression models, adjusted for an increasing number of confounders (sex, age, physical activity, morbidities, diabetes mellitus type II, TSH, albumin, HbA1c, smoking habits, alcohol intake, education, and energy intake/day), were used to calculate the association between low ALMBMI and high inflammation (tertile 3) according to MetS. Results: MetS was present in 36.2\% of the study population, and 9\% had low ALMBMI. In the whole study population, high CRP (odds ratio [OR]: 2.7 [95\% CI: 1.6-4.7; p = 0.001]) and high IL-6 (OR: 2.1 [95\% CI: 1.2-1.9; p = 0.005]) were associated with low ALMBMI. In contrast, no significant association was found between TNF, IL-10, or IL-1 beta with low ALMBMI. When participants were stratified by MetS, results for IL-6 remained significant only in participants with MetS. Conclusions: Among BASE-II participants, low ALMBMI was associated with inflammation. Low-grade inflammation triggered by disease state, especially in the context of MetS, might favor loss of muscle mass, so a better control of MetS might help to prevent sarcopenia. Intervention studies to test whether strategies to prevent MetS might also prevent loss of muscle mass seem to be promising.},
  language  = {en}
}