| Summary: | 碩士 === 中國文化大學 === 體育學系運動教練碩博士班 === 107 === Background: The specific dynamic postures for different sports performance affeted the improvement of sprinting and jumping. Based on the Specific Adaptation to Imposed Demands (SAID), the training movements similar to the dynamic postures which were stimulated by external loads could transfer the training effects to specific sports skills. Purpose: This study aimed to investigate the effects of deadlift training at a specific joint angle on the maximum muscular strength of lower limb and dynamic ability in collegiate rugby players. Methods: Twelve male collegiate rugby players were recruited and randomly assigned to 7 consecutive weeks, 3 times per week and 21 training sessions of an identical resistance training program in Back Squat Group (BQG) (age: 22.2±3.7 years old, height: 172.3±7.8 cm, and body weight: 85.7±7.7 kg) and Hexagonal Barbell Deadlift Group (HBDG) (age: 20.2±1.3 years old, height: 171.7±1.6 cm, and body weight: 77.3±10.1 kg) respectively. All selected subjects were assessed one maximum muscular strength (Back Squat and Hexagonal Barbell Deadlift) as well as dynamic abilities (long-jump, squat jump, countermovement jump, 20-yard, and 40-yard sprint, and so forth.) before and after the study. Repeated measures two-way analysis of variance (two-way ANOVA), mixed design was used to analyze the data. The significant level was set as α=0.05. Results: The one maximum muscular strength of back squat test (F=12.862; p=0.016<0.05) and hex barbell test (F=18876; p=0.007<0.05) respectively in HBDG showed a significant difference; meanwhile, the performance of counter-movement jump still improved significantly (F=7.675; p =0.039<0.05). It appeared no significant difference; however, the long jump test exited the tendency of improvement (pre: 229.8 ± 16.7 cm, post: 237 ± 18.1 cm) in HBDG. Conclusion: The deadlift training at a single specific joint improved the maximal strength effectively for rugby players, but could not benefit most parts of physical abilities. Also, the movements of a specific angle may also select a similar function related to agonists for the sake of assisting the transferring of muscular strength. Hence, it recommended that the strength and conditioning coaches may consider how to select a specific joint angle movement in the particular training phase in order to improve the maximum muscle strength of the lower limb.
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