Abstract
Background：The ease of sit-to-stand（STS）leads to reduction of burden on muscle activity. In the previous study, it is reported that the the height and tilting angle of a seating face（HAS）can influence the STS. It is, however, unclear how the HAS affects the STS. The aim of the present study is to examine the combination of HAS to ease the STS. Methods：Subjects were 12 healthy men. Evaluation of muscle activity was performed on the surface electromyography（SE）. SE adhered to Vastus lateralis（VL）, Rectus femoris（RF）, Vastus medialis and Tibialis anterior. Each HAS prepared 3 patterns. Therefore, the STS experiment was conducted with 9 patterns in total（3×3 patterns combined）. HAS was analyzed in a two-way analysis of variance（two-way ANOVA）. Results：In VL, there was a significant difference due to HAS difference（p=0.027）. There was a significant difference in the height of each muscle group（p=0.000）, Angle was only RF significant（p=0.009）. Conclusion：Combination of HAS was effective in VL. it was found that high chair has small muscle activity and low chair has large muscle activity. RF muscle activity is alleviated by anteversion angle.
