Effects of 6-month treadmill exercise intervention on 6-minute walk distance after stroke. R-CONTROL = control group, T-AEX = treadmill aerobic exercise group. Source: Reprinted with permission from Macko RF, Ivey FM, Forrester LW, Hanley D, Sorkin JD, Katzel LI, Silver KH, Goldberg AP. Treadmill exercise rehabilitation improves ambulatory function and cardiovascular fitness in patients with chronic stroke: A randomized, controlled trial. Stroke. 2005; 36(10): 2206–11. [PMID: 16151035]