Investigation of Effective Parts for Rotation and Translation of the Legs Using Hanger Reflex

When wearing a wire hanger on the head, an illusory force sense called the Hanger Reflex will occur. This phenomenon transpires not only at the head but also at the waists, wrists, and ankles. Dynamic control of the phenomenon by using pneumatic balloons has been proposed for the waist-type Hanger Reflex to enable direct rotation and translation of the user's body. However, this method is unsuitable for teaching different directions for the right and left legs, which is considered necessary for sports applications. In this study, we investigated which part of the leg is most effective for the direct rotation and translation of the leg. We also investigated the angle of the leg that was rotated when the Hanger Reflex device was attached to the thigh, knee, shin, and ankle, and the amount of translation. As a result, it was found that the most effective way to rotate and translate the leg was to rotate in the knee region, and that a greater extent of leg rotation was possible here than in other studies. These results suggest that a Hanger Reflex device is a possible candidate to rotate and translate the leg.