Abstract
The study was to examined the lower extremity movements of the semi-western and western grips during the forehand stroke in five male tennis players and determined the muscle activity of the upper extremities, with the following conclusions. First, the overall duration of each segment did not show significant differences, but the semi-western grip showed faster duration on average at P1 and the western grip at P2. Second, it was found that it is desirable to reduce the change in left-right width at the moment of impact to increase the rotational force and facilitate the weight transfer with anterior movement. Third, the lower extremity joint angles showed a statistically significant difference in the left hip joint E1 (p<.05), and a significant difference in the right ancle joint. Fourth, the mobilization of the spinae muscles to generate trunk rotation for smooth transfer of lower extremity kinetic energy and the activity of the deltoid and hip flexor muscles for a strong swing were found to be important factors in transferring momentum to the ball.
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