抄録
Since a Japanese-style bow is very complicated in both shape and structure, torques in horizontal and sagittal planes regarding grip must be applied to hit the target. This study biomechanically investigated the relationship between left forearm muscular activities and torques in horizontal (called the “NEJIRI” technique) and sagittal planes (called the “UWAOSHI” technique)regarding grip.Surface EMGs of four muscles (extensor carpi radialis longus, extensor digitorum, extensor carpi ulnaris, flexor carpi ulnaris) were collected from ten male subjects shooting arrows. The habit of the motion of drawing the bows that is called “BIKU” was measured incidentally from the experiment. As a result of statistics analysis, extensor digitorum and extensor carpi ulnaris muscles had positive relationships to the torque in the horizontal plane (“NEJIRI” technique). On the other hand, extensor carpi ulnaris and flexor carpi ulnaris muscles had positive relationships to the torque in the sagittal plane (“UWAOSHI” technique). It is suggested that extensor carpi ulnaris is complicatedly controlled to accomplish the operation of “TENOUCHI”, the shooting technique, in KYUDO.
