Objective To study the protective effects and mechanism of chlorogenic acid on articular cartilage injury induced by high-intensity exercises.Methods SD rats were randomly divided into 3 groups:exercise group,treatment group and control group.The rats of both exercise and treatment groups were trained in an autonomous exercise equipment with electric stimulation,40 min/d for 4 weeks,with 10 min/time and 1d/w rest.At the same time,chlorogenic acid was intraperitoneally injected into the rats of exercise grou...