Energy expenditure and walking ability in stroke patients: Their improvement by ankle-foot orthoses

In this study, we performed 6-minutes walking tests using a portable gas analyzer in patients with post-stroke hemiparesis, and examined the effects of ankle-foot orthosis (AFO) application on the walking ability and energy expenditure during walking. The subjects were 18 patients with post-stroke hemiparesis, who were admitted to the rehabilitation care unit of our rehabilitation center, and could walk. We performed 6-min walking tests with and without AFO application in these patients, and examined the walking distance and velocity, oxygen consumption (VO2), and heart rate (HR) during walking. The oxygen consumption per meter (VO(2)m(-1)) and physiological cost index (PCI) were determined as the efficiency of kinetic energy. The difference in the VO2 during walking was not significant between application and non-application of the AFO, but the differences in the walking distance and velocity and the VO(2)m(-1) and PCI were significant. It was suggested that improvement of the walking ability and reduction of energy expenditure during walking were possible in motion-impaired patients with post-stroke hemiparesis by AFO application.