RELATIONSHIP BETWEEN STRUCTURE AND MECHANICAL PROPERTIES OF BRAIDING GOLF SHAFTS AND KANSEI (P3)
4. Measurement of golf swing
A male who has golf playing experiences is a subject. Two different golf shafts were prepared; one was sheet winding shaft and another was braided shaft. EMG signal was measured by using telemeter (web-7000, Nihon Kohden Corporation) ࠊ position of infrared EMG sensor were attached at biceps brachii muscle, triceps brachii muscle, extensor muscle of the forearm, flexor muscles of the forearm, erector spinae muscles, lateral great muscle, and medial great muscle.
Figure 5 and Figure 6 shows wave pattern of EMG of the right and left biceps brachii muscle.In each figure, original wave pattern, full-wave rectification which was absolute value conversion from original wave pattern and the integration of EMG activity were shown.The total EMG activity was calculated by using these figures.
Figure 7 shows the EMG activity of biceps brachii muscle, triceps brachii muscle, extensor muscle of the forearm, flexor muscles of the forearm, erector spinae muscles, lateral great muscle, and medial great muscle.
Here, A was results of braided shaft and D was those of sheet winding shaft (commercial shaft). In each parts the values of A were larger than those of D. This results means that by using Braided golf shaft the player can exert their own power sufficiently.
5. “Kansei” evaluation
In this section, “Kansei” evaluation was described by using pair comparison method for D to A. Figure 8 shows the results of the evaluation. Here, in “Weight”, “Balance”, and “Direction”, the shaft D got high mark, however, the other evaluation item such as stiffness, flexibility, easy to swing, the distance of ball, the height of ball, timing at impact, easy to catch the ball and total evaluation had high score in the case of shaft A. From these evaluation results the player who uses the braided shaft better feeling, thus they can enjoy playing golf.
- Fabrication of braided golf shaft was established.
- The players can exhibit their own physical power efficiently by using braid golf
- The braided golf shaft gave better feeling to the players.