Body composition is distinctly altered in Turner syndrome: relations to glucose metabolism, circulating adipokines, and endothelial adhesion molecules

Abstract

BACKGROUND: Body composition in Turner syndrome (TS) is altered with final height of TS decreased; anthropometry and bone mass distinctly changed. AIM: To describe total and regional distribution of fat and muscle mass in TS and the relation to measures of glucose metabolism, sex hormones, IGFs, and markers of inflammation and vascular function. MATERIAL AND METHODS: Fifty-four women with TS (mean age, 42.5 +/- 9.7 years) and an age-matched group of controls (n = 55) were examined by dual-energy X-ray absorptiometry scans with determination of regional body composition and estimation of visceral fat and skeletal muscle mass. We determined maximal oxygen uptake and assessed physical activity using a questionnaire. We measured serum adiponectin, ghrelin, IGF-I, IGF-binding protein-3 (IGFBP-3), estradiol, testosterone, sex hormone-binding globulin (SHBG), insulin, glucose, cytokines, vascular cell adhesion molecule-I, and intercellular cell adhesion molecule-I. Insulin sensitivity was estimated. Multiple linear regression models were used to examine the relationships between variables. RESULTS: TS had lower total lean body mass (LBM), while body mass index (BMI) and total fat mass (FM) were increased. We found increased visceral FM, and decreased trunk LBM, appendicular LBM, and skeletal muscle mass. VO2max and physical activity were significantly lower in TS, as were most hormone levels, except increased leptin. In multiple linear regression models, status (i.e. TS or control) was a consistent contributing variable. CONCLUSION: Profound changes are present in body composition in TS, with increased FM, and decreased skeletal muscle mass. Circulating hormones, VO2max, and insulin sensitivity influence body composition. The accumulation of visceral fat would predict a higher risk of development of the insulin resistance syndrome.