There have been numerous research efforts quantifying exercise responses and cardiorespiratory fitness levels of the lower-limb disabled. However, no one testing modality has surfaced as an accepted standard. Instrumentation such as the wheelchair ergometer (Glaser et al. 1979; Knowlton et al. 1981), wheelchair treadmill (Gass et al. 1981; Horvat et al. 1984; van der Woude et al. 1989), arm crank ergometer (Bar-Or and Zwiren 1975; Kofsky et al. 1983), and wheelchair roller systems (Brauer 1972; Rhodes et al. 1981; Stoboy et al. 1971) have provided some empirical data, but have also complicated the process of comparing physiological responses among investigations.