Relationship between adiponectin and muscle mass in patients with metabolic syndrome and obesity

Background: Adiponectin is one of the most important adipokines in human beings. Obesity and sarcopenia are associated with a low-level chronic inflammatory status, and adiponectin plays an anti-inflammatory role. Aims: The objective of the current work was to study the association between muscle mass, determined via bioelectrical impedance (BIA), and circulating adiponectin levels among obese patients with metabolic syndrome who are older than 60 years of age. Methods: We performed a cross-sectional study incorporating 651 patients with obesity and metabolic syndrome. Anthropometric data, BIA data (total fat mass (FM), fat -free mass (FFM), fat -free mass index (FFMi), skeletal muscle mass (SMM) and skeletal muscle mass index (SMMi)), arterial pressure, HOMA-IR (homeostasis model assessment of insulin resistance), and biochemical parameters were recorded. Results: The patients were separated into two groups based on their median SMMi (skeletal muscle mass index) levels. The low-SMMi group presented adiponectin levels that were higher than those in the high-SMMi group (delta value: 4.8 + 0.7 ng/dl: p = 0.02). Serum adiponectin values were negatively correlated with fat mass (FM), fat -free mass (FFM), fat -free mass index (FFMi), SMM, and SMMi. Adiponectin presented a negative correlation with HOMA-IR and a positive correlation with HDL-cholesterol. In the final multivariate model using SMMi as a dependent variable, adiponectin levels explained 18 % of the variability (Beta -0.49, CI95% -0.89 to -0.16) after adjusting for age and gender. Conclusions: Serum adiponectin levels are negatively associated with low skeletal muscle mass among obese subjects with metabolic syndrome who are older than 60 years of age.