Relationship between sarcopenic obesity-related phenotypes and inflammatory markers in postmenopausal women

Ageing is associated with changes in body composition that may result in sarcopenic obesity (SO). Interleukin-6 (IL-6) and C-reactive protein (CRP) are important inflammatory markers related to ageing. SO has been examined as an important public health problem, but its association with inflammatory markers has yet to be investigated. The aim of this study was to investigate the association between SO-related phenotypes and inflammatory markers in postmenopausal women. A total of 130 women (66·7 ± 5·2 years) underwent body composition evaluation using dual-energy X-ray absorptiometry. Volunteers were classified according to a SO definition previously described in the literature. Waist circumference (WC) and handgrip strength (HG) were also measured. Blood samples were collected for CRP, tumour necrosis factor and IL-6 measurements. All the inflammatory markers were higher in SO individuals when compared to non-SO; however, only IL-6 reached statistical significance (median 3·34 versus 1·37 pg ml^-1 ; P<0·05). Also, CRP was significantly correlated (P<0·01) with body mass index (r_s  = 0·34), fat mass (FM; r_s  = 0·25) and WC (r_s  = 0·33). Similarly, IL-6 levels were significantly correlated (P<0·05) to age (r_s  = 0·19), FM (r_s  = 0·19) and WC (r_s  = 0·17). HG was found to be significantly reduced among subjects with higher IL-6 levels (P = 0·02). In summary, the combination of reduced muscle mass and excess body fat (i.e. SO) is associated with elevated inflammatory markers in postmenopausal women. Moreover, CRP and IL-6 are associated with SO-related phenotypes in this population.