(School of Physical Education,South China Normal University,Guangzhou 510006,China) Abstract: In order to probe into the pathogenesis of NAFLD suffered by obese and obesity resistant rats and whether there are any differences between the effects of intervention produced by exercising on different tendency models, so as to provide experimental data for controlling NAFLD better, the authors established models by means of high fat food induction, selected obese and obesity resistant rats therefrom, confirmed the success of model estab-lishment via pathological slices of liver tissues, then let the rats swim for 5 weeks, observed the effects of interven-tion produced by exercising on different types of NAFLD by measuring indexes such as body fat, fat to weight ratio, blood fat, liver index, leptin index, fastening blood glucose and insulin level etc after exercising was finished, and revealed the following findings: there was no significant difference between the body mass of the rats in the obesity resistant group and the body mass of the rats in the normal group, but the same as the rats in the obese group, the rats in the obesity resistant group had an energy metabolism disorder; the rats in the obese group had insulin resis-tance and leptin resistance, while the rats in the obesity resistant group showed no insulin resistance but leptin resis-tance; the effect of NAFLD improvement produced by swimming on the rats in the obese group was more signifi-cant than the effect of NAFLD improvement produced by swimming on the rats in the obesity resistant group. The findings indicate the followings: the pathogenesis of NAFLD suffered by the rats in the obese group is not the same as the pathogenesis of NAFLD suffered by the rats in the obesity resistant group, neither are the effects of interven-tion produced by swimming on them; swimming increases energy consumption, reduces lipid deposition, can sig-nificantly improve leptin resistance of the rats in the obese group, thus restore the fat-insulin negative feedback regulation mechanism, then improve IR, and promote the turnaround of NAFLD; the mechanism of improvement produced by swimming on the rats in the obesity resistant group may be different from the mechanism of improve-ment produced by swimming on the rats in the OB group; swimming improves leptin resistance and promotes the turnaround of NAFLD mainly by regulating the leptin receptor binding rate. Key words: sports physiology;NAFLD;obesity;obesity resistance;swimming;rat |