| Summary: | 博士 === 國立體育大學 === 競技與教練科學研究所 === 102 === Purpose: The purpose of this study was to analysis the trunk and upper limb muscle activity and kinematics of different forehand drive in male tennis players. Method: Six elite and six recreational male tennis players were participated in this study. Muscle activity was determined using wireless surface electromyography and capture by the Vicon high-speed motion system. The EMG activity was recorded from eight muscles (Right external oblique: REO, Left external oblique: LEO, Right erector spinae: RES, Left erector spinae: LES, Right biceps: RB, Right triceps: RT, Right extensor carpi: REC, Right flexor carpi: RFC). The kinematics parameters were recorded from shoulder, elbow, wrist angle and angular velocity. (Shoulder addution / abdution: SHADD, Shoulder internal rotation / external rotation: SHINR, Elbow flexion / extension: ELF, Wrist flexion / extension: WRF). A two-way ANOVA with mixed design was used to evaluate on each EMG and kinematics variables. When a significant difference was revealed, Bonferroni post hoc test was used to specify where the difference occurred. Statistical significance was set at p < 0.05.
Results: 1. During down the line acceleration phase, the REO activation of the elites group was significantly higher than the recreational group players (p <.05). 2. During crosscourt follow-through phase, the LES and REC activation of the recreational group was significantly higher than the elites group (p <.05). 3. During down the line acceleration phase, the high speed forehand drive of the SHADD angle was significantly less than the low speed (p <.05). 4. During crosscourt acceleration phase, the low speed forehand drive of the SHADD and SHINR angular velocity was significantly less than the high speed (p <.05). 5. During down the line follow-through phase, the forehand drive low speed of the ELF, WRF angular velocity was significantly less than the high speed (p <.05).
Conclusion: Elite male tennis players were used more SHINR angular velocity to induce ball speed, resistance vibration transmission of ball impact and avoid excessive load on the elbow. The recreational players can priority training REO, LES RB and REC, SHINR muscles and induce SHINR angular velocity during forehand drive.
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