Body fat predicts an increase and limb muscle strength predicts a decrease in leptin in older adults over 2.6 years

ObjectiveObesity is characterized by hyperleptinaemia, which is associated with diabetes, hypertension and coronary heart disease. The aim of this study was to determine if body fat and muscle measures predict the natural increase in leptin over 26years in older adults. MethodsA total of 190 subjects (50% females) aged between 50 and 79years were selected to perform the serum measurements for leptin. Height and weight were measured and body mass index (BMI) was calculated. Fat and lean mass of the whole body and the trunk were acquired through dual-energy X-ray absorptiometry (DXA). Leg muscle strength and handgrip strength were measured using dynamometry. ResultsIn multivariable analyses, leg muscle strength was negatively associated with both baseline leptin (: -005g/l per kg, 95% CI: -008, -002) and follow-up leptin (: -004g/l per kg, 95% CI: -007, -001). BMI, and percentage total fat and trunk fat and their respective change per annum (cpa) were significantly and positively associated with leptin. Lean mass was negatively associated with baseline leptin. Gender-specific analyses produced similar associations between leg muscle strength, fat measures and follow-up leptin in males and females. ConclusionBesides positive associations between body fat, trunk fat and leptin, we found that leg muscle strength was negatively associated with leptin after 26years in a sample of older population. This suggests that interventions to maintain or increase muscle strength may have a protective effect on hyperleptinaemia.