Mixed
Aerobic exercise (AE) reduces intrahepatic lipid and visceral adipose tissue and improves insulin sensitivity in obese adolescent girls, whereas resistance exercise (RE) does not produce these specific metabolic benefits despite reducing intermuscular adipose tissue.
For obese adolescent girls aiming to improve metabolic health (specifically liver fat and insulin sensitivity) without losing weight, 3 hours of moderate-to-vigorous aerobic exercise per week (e.g., treadmill/elliptical) is effective. Resistance training alone, while beneficial for muscle strength and intermuscular fat, does not significantly reduce liver or visceral fat in this group.
In obese adolescent girls, AE but not RE is effective in reducing liver fat and visceral adiposity and improving insulin sensitivity independent of weight loss or calorie restriction.
Why this rating
Randomized controlled trial with rigorous measurement (MRI, MRS, hyperinsulinemic euglycemic clamp), though sample size is modest (n=44) and limited to a specific demographic.
Source
Aerobic exercise but not resistance exercise reduces intrahepatic lipid content and visceral fat and improves insulin sensitivity in obese adolescent girls: a randomized controlled trial
SoJung Lee et al. · American Journal of Physiology-Endocrinology and Metabolism · 2013
DOI 10.1152/ajpendo.00285.2013
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