Knight and L~nderee~~ measured blood flow to the uninjured ankle with a repeated measures design of heat packs, cold packs, control, alter- nating heat and exercise, alternating cold and exercise, and alternating no treatment (control) and exercise, for 45 minutes. Blood flow was significantly greater during heat applications than for either cold or control. Blood flow de- creased during cold applications. Exercise ap- peared to supersede the effects of cold on blood flow