Conversely, Bird et al. found no significant training effects on
balance performance while standing on a firm surface16). The reason our results differ may be due to the difference in training
period and frequency. In the present study, stroke survivors were trained for 3 times/week for 8 weeks, while patients in the
study by Bird et al. were trained 2 times/week for 5 weeks16). This suggests that there may be a dose response effect that
should be verified in future studies.