Ergonomic Consideration on Car Seat Lever Position

Car seats are accompanied by an adjustment mechanism that allows comfortable posture. The increase of female drivers is remarkable, the muscle strength tends to be lower than men, and it is necessary to find the lever position which is particularly easy to manipulate. In this study, we used a precision jig on the side of the seat and measured subjective and EMG integral values at multiple positions on the adjustment lever. The EMG integral value with large individual differences was analyzed by mixed effect modeling in which subjects were variable effect and lever position was fixed effect. As a comfortable position of lever to manipulate for both males and females, the existence, position, where the subjective evaluation was good and the EMG integral value was low was statistically significant.