Reduced Fat Oxidation During Exercise in Post-Menopausal Overweight-Obese Women with Higher Lipid Accumulation Product Index.

Background and Aims The main aim of this study was to analyze how the lipid accumulation affects the whole-body fat oxidation over a range of intensities during a submaximal incremental exercise test in post-menopausal overweight-obese women. Patients and Methods The maximal fat oxidation (MFO), the intensity where the MFO occurs (FatMax), fat oxidation were measured over a range of intensities during a submaximal incremental exercise test through indirect calorimetry in 60 postmenopausal overweight-obese women (aged >49 years; body mass index 28.0 to 39.0 kg/m(2)). The metabolic profile of participants was evaluated and the LAP index was calculated (waist-58 x triglycerides [mmol/L]). A cutoff point of 34.5 was adopted and participant were designed as low LAP index (n = 30) or high LAP index (n = 30). Results During submaximal exercise postmenopausal overweight-obese women with low LAP index showed a higher fat oxidation at 50% (0.53 +/- 0.05 vs. 0.45 +/- 0.12 g/min; p = 0.01), 60% (0.40 +/- 0.06 vs. 0.31 +/- 0.16 g/min; p = 0.02) and 70% (0.34 +/- 0.08 vs. 0.25 +/- 0.15 g/min; p = 0.03) of VO2Peak than those with high LAP index. No significant difference was observed in carbohydrate oxidation between groups (p >0.05) during exercise. Moreover, a significant difference in absolute MFO (p = 0.018), MFO relative to free fat mass (p =0.043) and FatMax (p = 0.002) was identified. Conclusion Postmenopausal overweight-obese women who showed unhealthy metabolic phenotype evaluated through LAP index presented low fat oxidation during a submaximal incremental exercise.