The invention provides a method for determining the efficacy of compositions used to treat articular joint conditions in mammals. The method includes measuring the change in levels of one or more cartilage degradation biomarkers in a mammal from before exercise and after exercise, then administering a composition used to treat articular joint conditions to the mammal, and measuring the change in levels of one or more cartilage degradation biomarkers in the mammal from before exercise and after exercise.
