Change in peak oxygen consumption, measured with body weight, from discharge (DC = 42) to 6 weeks (n = 42) and 12 weeks (n = 24). 6- and 12-week subject groups were combined for final analysis. Abbreviations: DC, discharge. 6 wk, 6-week rehabilitative exercise. 12 wk, 12-week rehabilitative exercise. Peak VO2, peak oxygen consumption.