5 years ago

Exercise training reduces intrahepatic lipid in people with and people without non-alcoholic fatty liver.

Dennis Dahlmans, Vera B Schrauwen-Hinderling, Matthijs K C Hesselink, Lauren M Sparks, Tomas Jelenik, Bram Brouwers, Patrick Schrauwen, Anne Gemmink, Michael Roden, Yvonne Bruls, Bas Havekes
Exercise training reduces intrahepatic lipid (IHL) content in people with elevated liver fat content. It is unclear, however, whether exercise training reduces IHL content in people with normal liver fat content. Here, we measured the effect of exercise training on IHL content in people with and people without non-alcohol fatty liver. We further measured changes in insulin sensitivity and hepatic energy metabolism. Eleven males with non-alcoholic fatty liver (NAFL) and 11 BMI-matched individuals without non-alcoholic fatty liver (CON) completed a 12-week supervised exercise training program. IHL content (proton magnetic resonance spectroscopy), maximal oxidative capacity (VO2max, spiroergometry), total muscle strength, body composition, insulin sensitivity (hyperinsulinemic-euglycemic clamp), hepatic ATP/total phosphorus ratio and hepatic phosphomonoester/phosphodiester (PME/PDE) ratio (phosphorus magnetic resonance spectroscopy) were determined. IHL content reduced with exercise training (p=0.014) in the whole study population. The relative reduction in IHL content was comparable in NAFL (-34.5 ± 54.0%) and CON (-28.3 ± 60.1%) individuals (p=0.800). VO2max (p<0.001), total muscle strength (p<0.001) and skeletal muscle insulin sensitivity increased (p=0.004), whereas adipose tissue (p=0.246) and hepatic (p=0.086) insulin sensitivity did not increase significantly. Hepatic ATP/total phosphorus ratio (p=0.987) and PME/PDE ratio (p=0.792) did not change. Changes in IHL content correlated with changes in body weight (r=0.451, p=0.035) and changes in hepatic PME/PDE ratio (r=0.569, p=0.019). In conclusion, exercise training reduced intrahepatic lipid content in people with non-alcoholic fatty liver and in people with normal intrahepatic lipid content, and the percent reduction in intrahepatic lipid content was similar in both groups.

Publisher URL: http://doi.org/10.1152/ajpendo.00266.2017

DOI: 10.1152/ajpendo.00266.2017

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