| Summary: | 碩士 === 國立體育大學 === 競技與教練科學研究所 === 107 === Purpose: The purpose of this study was to evaluate the effects of 8 weeks of
periodization strength training on muscle structure, squat jump (SJ) and countermovement jump (CMJ) performance. Methods: Fourteen male collegiate basketball players (height = 184.7 ± 5.6cm;body mass = 80.4 ± 9.6kg) with minimal one year strength training experience were recruited in this study. Eight weeks periodization strength training program was divided into two phases, 1 to 4 weeks as muscle endurance phase (4×10, 4 times/week), 5 to 8 weeks (3×5, 3 times/week) as strength and power phase. Pre- (week 0), mid- (week 5), and post- (week 9) tests were held. SJs and CMJs were measured on a force platform, force-time curve were collected for further analysis;Using ultrasonography, vastus lateralis (VL), vastus medialis (VM), and lateral gastrocnemius (LG) muscle thickness (MT) pennation angle (PA) and fascicle length (FL), and Achilles tendon (AT) thickness and length were measured. Statistical Analysis: VJs variables at 3 measured points were analyzed by using one-way repeated ANOVA. Z score were used for the smallest worthwhile change (SWC). Result: From pre- to mid- test, VL-MT of both legs and VM of the right leg was significantly increased (p < .05). Contraction time of CMJ and peak force of both jumps were significantly increased (p < .05); From mid- to post- test, pannation angle cross 3 muscles having a worthwhile difference in the standardized z-scores, however, only the left leg LG significantly improved (p < .05).Time to peak force and peak power output from both jumps were significantly increased (p < .05), and peak power and peak force RFD are significantly increased (p< .05).Conclusion: The results show that different strength training contents will directly lead to changes in muscle structures, and affect the vertical jumping performance. Muscle thickness after muscle endurance training increased, therefore, enhanced the PF from CMJ and SJ. Strength and power training increased the PA, rate of force development (RFD) from CMJ and SJ improved significantly.
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