Abstract
[Purpose] The purpose of this study was to evaluate the effects of wheel chair tilt systems on lower limb hemodynamic states and their relationship to mechanical factors using near-infrared spectroscopy and a pressure distribution measuring system. [Subjects] Twelve healthy adult volunteers participated in this study. [Methods] We measured the lower limb hemodynamic states and pressure distribution experienced in a wheelchair in four tilt-conditions: reclining by five degrees, ten degrees, twenty degrees and full tilt-reclining. [Results] The results show a significant decrease in Deoxy-Hb was induced in the full-tilt reclining position. Furthermore, in comparison with the other sitting positions, full-tilt reclining produced a decrease in contact area, especially in the posterior femoral region. [Conclusion] These results suggest wheelchairs that combine tilt and reclining capabilities can, by altering the sitting position and thus improving lower limb hemodynamic states, prevent venous edema in wheelchair users who cannot perform active muscular pumping.
