Authors | Shojaee-Moradie, F., Cuthbertson, D. J., Kemp, G. J., Barrett, M., Jackson, N. C., Batt, J., Herring, R. A., Wright, J., Russell-Jones, D., Thomas, E. L., Bell, J. and Umpleby, A. M. |
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Abstract | Aim: To investigate the effect of 16-weeks supervised moderate intensity exercise training on VLDL1 and VLDL2 TG and apolipoproteinB (apoB) metabolism in men with NAFLD. Methods: Men with NAFLD were randomised to either exercise training for 16 weeks (Exe-group; n=15) or lifestyle advice (control-group; n=11). Insulin sensitivity (IS; by HOMA2), adipose tissue insulin resistance (ATIR; plasma FFA/insulin) and liver fat (magnetic resonance spectroscopy), total body and visceral fat (magnetic resonance imaging), VO2max (indirect calorimetry) were measured. Using stable isotope techniques VLDL1 and VLDL2 TG and apoB kinetics were measured before and after the intervention. Results: After 16 weeks VO2max increased 30.9% and liver fat decreased 42.6% in the exe-group (p<0.001, p<0.005 respectively) with no change in the controls. Body weight, fat mass, visceral fat and ATIR decreased in the exe-group compared to the controls (all p<0.02). In the exe-group IS increased (p<0.02) and both VLDL1 apoB production (p<0.003) and fractional catabolic rate (FCR) increased (p<0.02). VLDL1 TG kinetics did not change but there was a decrease in VLDL1 TG/VLDL1 apoB pool size (p<0.03). The kinetics of VLDL2 apoB did not change but VLDL2 TG FCR increased (p< 0.05) and VLDL2 TG and apoB pool size decreased (both p=0.06). Conclusion: Sixteen weeks of exercise training increased VLDL1 apoB flux and reduced VLDL1 particle size. The reduced VLDL2 TG pool size was due to an increased VLDL2 TG FCR. These effects may be related to increased IS and decreased ATIR. Although liver fat decreased it was insufficient to decrease VLDL TG secretion. |
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